fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of mounts.

According to the versions of the kernel packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities :

  - The hi3660_stub_clk_probe function in     drivers/clk/hisilicon/clk-hi3660-stub.c in the Linux     kernel before 4.16 allows local users to cause a denial     of service (NULL pointer dereference) by triggering a     failure of resource retrieval.(CVE-2018-10074i1/4%0

  - An information leak flaw was found in the RAM Disks     Memory Copy (rd_mcp) backend driver of the iSCSI Target     subsystem of the Linux kernel. A privileged user could     use this flaw to leak the contents of kernel memory to     an iSCSI initiator remote client.(CVE-2014-4027i1/4%0

  - It was found that in the Linux kernel version 4.2-rc1     to 4.3-rc1, a use of uninitialized 'n_proto',     'ip_proto', and 'thoff' variables in
    __skb_flow_dissect() function can lead to a remote     denial-of-service via malformed MPLS     packet.(CVE-2017-13715i1/4%0

  - It was found that the packet_set_ring() function of the     Linux kernel's networking implementation did not     properly validate certain block-size data. A local     attacker with CAP_NET_RAW capability could use this     flaw to trigger a buffer overflow, resulting in the     crash of the system. Due to the nature of the flaw,     privilege escalation cannot be fully ruled     out.(CVE-2017-7308i1/4%0

  - A weakness was found in the Linux ASLR implementation.
    Any user able to running 32-bit applications in a x86     machine can disable ASLR by setting the RLIMIT_STACK     resource to unlimited.(CVE-2016-3672i1/4%0

  - sound/soc/msm/qdsp6v2/msm-audio-effects-q6-v2.c in the     MSM QDSP6 audio driver for the Linux kernel 3.x, as     used in Qualcomm Innovation Center (QuIC) Android     contributions for MSM devices and other products,     allows attackers to cause a denial of service     (out-of-bounds write and memory corruption) or possibly     have unspecified other impact via a crafted application     that makes an ioctl call triggering incorrect use of a     parameters pointer.(CVE-2016-2065i1/4%0

  - A race condition flaw was found in the ioctl_send_fib()     function in the Linux kernel's aacraid implementation.
    A local attacker could use this flaw to cause a denial     of service (out-of-bounds access or system crash) by     changing a certain size value.(CVE-2016-6480i1/4%0

  - The omninet_open function in     drivers/usb/serial/omninet.c in the Linux kernel before     4.10.4 allows local users to cause a denial of service     (tty exhaustion) by leveraging reference count     mishandling.(CVE-2017-8925i1/4%0

  - The tower_probe function in     drivers/usb/misc/legousbtower.c in the Linux kernel     before 4.8.1 allows local users (who are physically     proximate for inserting a crafted USB device) to gain     privileges by leveraging a write-what-where condition     that occurs after a race condition and a NULL pointer     dereference.(CVE-2017-15102i1/4%0

  - The rtnl_fill_link_ifmap function in     net/core/rtnetlink.c in the Linux kernel before 4.5.5     does not initialize a certain data structure, which     allows local users to obtain sensitive information from     kernel stack memory by reading a Netlink     message.(CVE-2016-4486i1/4%0

  - A vulnerability was found in the Linux kernel's     lp_setup() function where it doesn't apply any bounds     checking when passing 'lp=none'. This can result into     overflow of the parport_nr array. An attacker with     control over kernel command line can overwrite kernel     code and data with fixed (0xff)     values.(CVE-2017-1000363i1/4%0

  - sound/core/hrtimer.c in the Linux kernel before 4.4.1     does not prevent recursive callback access, which     allows local users to cause a denial of service     (deadlock) via a crafted ioctl call.(CVE-2016-2549i1/4%0

  - The pn_recvmsg function in net/phonet/datagram.c in the     Linux kernel before 3.12.4 updates a certain length     value before ensuring that an associated data structure     has been initialized, which allows local users to     obtain sensitive information from kernel stack memory     via a (1) recvfrom, (2) recvmmsg, or (3) recvmsg system     call.(CVE-2013-7265i1/4%0

  - A NULL pointer dereference flaw was found in the SCTP     implementation. A local user could use this flaw to     cause a denial of service on the system by triggering a     kernel panic when creating multiple sockets in parallel     while the system did not have the SCTP module     loaded.(CVE-2015-5283i1/4%0

  - It was found that in Linux kernel the mount table     expands by a power-of-two with each bind mount command.
    If a system is configured to allow non-privileged user     to do bind mounts, or allows to do so in a container or     unprivileged mount namespace, then non-privileged user     is able to cause a local DoS by overflowing the mount     table, which causes a deadlock for the whole     system.(CVE-2016-6213i1/4%0

  - The cifs_iovec_write function in fs/cifs/file.c in the     Linux kernel through 3.13.5 does not properly handle     uncached write operations that copy fewer than the     requested number of bytes, which allows local users to     obtain sensitive information from kernel memory, cause     a denial of service (memory corruption and system     crash), or possibly gain privileges via a writev system     call with a crafted pointer.(CVE-2014-0069i1/4%0

  - A flaw was found in the Linux kernel's implementation     of XFS file attributes. Two memory leaks were detected     in xfs_attr_shortform_list and xfs_attr3_leaf_list_int     when running a docker container backed by xfs/overlay2.
    A dedicated attacker could possible exhaust all memory     and create a denial of service     situation.(CVE-2016-9685i1/4%0

  - Multiple integer overflows in the MDSS driver for the     Linux kernel 3.x, as used in Qualcomm Innovation Center     (QuIC) Android contributions for MSM devices and other     products, allow attackers to cause a denial of service     or possibly have unspecified other impact via a large     size value, related to mdss_compat_utils.c, mdss_fb.c,     and mdss_rotator.c.(CVE-2016-5344i1/4%0

  - kernel/bpf/verifier.c in the Linux kernel through     4.14.8 ignores unreachable code, even though it would     still be processed by JIT compilers. This behavior,     also considered an improper branch-pruning logic issue,     could possibly be used by local users for denial of     service.(CVE-2017-17862i1/4%0

  - A flaw was found in the Linux kernel's implementation     of the SCTP protocol. A remote attacker could trigger     an out-of-bounds read with an offset of up to 64kB     potentially causing the system to     crash.(CVE-2016-9555i1/4%0

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2018-0015 for details.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0174 for details.

The remote Oracle Linux 6 / 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2017-3659 advisory.

  - A missing authorization check in the fscrypt_process_policy function in fs/crypto/policy.c in the ext4 and     f2fs filesystem encryption support in the Linux kernel before 4.7.4 allows a user to assign an encryption     policy to a directory owned by a different user, potentially creating a denial of service.
    (CVE-2016-10318)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote OracleVM system is missing necessary patches to address critical security updates : please see Oracle VM Security Advisory OVMSA-2017-0145 for details.

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-3609 advisory.

  - The xen_biovec_phys_mergeable function in drivers/xen/biomerge.c in Xen might allow local OS guest users     to corrupt block device data streams and consequently obtain sensitive memory information, cause a denial     of service, or gain host OS privileges by leveraging incorrect block IO merge-ability calculation.
    (CVE-2017-12134)

  - The Linux Kernel imposes a size restriction on the arguments and environmental strings passed through     RLIMIT_STACK/RLIM_INFINITY (1/4 of the size), but does not take the argument and environment pointers into     account, which allows attackers to bypass this limitation. This affects Linux Kernel versions 4.11.5 and     earlier. It appears that this feature was introduced in the Linux Kernel version 2.6.23.
    (CVE-2017-1000365)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update for kernel is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* An use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system.
(CVE-2016-10200, Important)

* A flaw was found that can be triggered in keyring_search_iterator in keyring.c if type->match is NULL. A local user could use this flaw to crash the system or, potentially, escalate their privileges.
(CVE-2017-2647, Important)

* It was found that the NFSv4 server in the Linux kernel did not properly validate layout type when processing NFSv4 pNFS LAYOUTGET and GETDEVICEINFO operands. A remote attacker could use this flaw to soft-lockup the system and thus cause denial of service.
(CVE-2017-8797, Important)

This update also fixes multiple Moderate and Low impact security issues :

* CVE-2015-8839, CVE-2015-8970, CVE-2016-9576, CVE-2016-7042, CVE-2016-7097, CVE-2016-8645, CVE-2016-9576, CVE-2016-9588, CVE-2016-9806, CVE-2016-10088, CVE-2016-10147, CVE-2017-2596, CVE-2017-2671, CVE-2017-5970, CVE-2017-6001, CVE-2017-6951, CVE-2017-7187, CVE-2017-7616, CVE-2017-7889, CVE-2017-8890, CVE-2017-9074, CVE-2017-8890, CVE-2017-9075, CVE-2017-8890, CVE-2017-9076, CVE-2017-8890, CVE-2017-9077, CVE-2017-9242, CVE-2014-7970, CVE-2014-7975, CVE-2016-6213, CVE-2016-9604, CVE-2016-9685

Documentation for these issues is available from the Release Notes document linked from the References section.

Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin (Virtuozzo) for reporting CVE-2017-2647; Igor Redko (Virtuozzo) and Vasily Averin (Virtuozzo) for reporting CVE-2015-8970; Marco Grassi for reporting CVE-2016-8645; and Dmitry Vyukov (Google Inc.) for reporting CVE-2017-2596. The CVE-2016-7042 issue was discovered by Ondrej Kozina (Red Hat); the CVE-2016-7097 issue was discovered by Andreas Gruenbacher (Red Hat) and Jan Kara (SUSE); the CVE-2016-6213 and CVE-2016-9685 issues were discovered by Qian Cai (Red Hat); and the CVE-2016-9604 issue was discovered by David Howells (Red Hat).

Additional Changes :

For detailed information on other changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

Security Fix(es) :

  - An use-after-free flaw was found in the Linux kernel     which enables a race condition in the L2TPv3 IP     Encapsulation feature. A local user could use this flaw     to escalate their privileges or crash the system.
    (CVE-2016-10200, Important)

  - A flaw was found that can be triggered in     keyring_search_iterator in keyring.c if type->match is     NULL. A local user could use this flaw to crash the     system or, potentially, escalate their privileges.
    (CVE-2017-2647, Important)

  - It was found that the NFSv4 server in the Linux kernel     did not properly validate layout type when processing     NFSv4 pNFS LAYOUTGET and GETDEVICEINFO operands. A     remote attacker could use this flaw to soft- lockup the     system and thus cause denial of service. (CVE-2017-8797,     Important)

This update also fixes multiple Moderate and Low impact security issues :

  - CVE-2015-8839, CVE-2015-8970, CVE-2016-9576,     CVE-2016-7042, CVE-2016-7097, CVE-2016-8645,     CVE-2016-9576, CVE-2016-9588, CVE-2016-9806,     CVE-2016-10088, CVE-2016-10147, CVE-2017-2596,     CVE-2017-2671, CVE-2017-5970, CVE-2017-6001,     CVE-2017-6951, CVE-2017-7187, CVE-2017-7616,     CVE-2017-7889, CVE-2017-8890, CVE-2017-9074,     CVE-2017-8890, CVE-2017-9075, CVE-2017-8890,     CVE-2017-9076, CVE-2017-8890, CVE-2017-9077,     CVE-2017-9242, CVE-2014-7970, CVE-2014-7975,     CVE-2016-6213, CVE-2016-9604, CVE-2016-9685

The remote OracleVM system is missing necessary patches to address critical security updates :

  - dentry name snapshots (Al Viro) [Orabug: 26630936]     (CVE-2017-7533)

  - scsi: libiscsi: use kvzalloc for iscsi_pool_init (Kyle     Fortin) 

  - mm: introduce kv[mz]alloc helpers (Kyle Fortin) [Orabug:
    26621191]

  - KEYS: Disallow keyrings beginning with '.' to be joined     as session keyrings (David Howells) [Orabug: 26621179]     (CVE-2016-9604) (CVE-2016-9604)

  - l2tp: fix racy SOCK_ZAPPED flag check in     l2tp_ip[,6]_bind (Guillaume Nault) [Orabug: 26621176]     (CVE-2016-10200)

  - mnt: Add a per mount namespace limit on the number of     mounts (Eric W. Biederman) [Orabug: 26621171]     (CVE-2016-6213) (CVE-2016-6213)

  - ipv6: fix out of bound writes in __ip6_append_data (Eric     Dumazet) [Orabug: 26621163] (CVE-2017-9242)

The remote Oracle Linux 6 / 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-3605 advisory.

  - Race condition in the L2TPv3 IP Encapsulation feature in the Linux kernel before 4.8.14 allows local users     to gain privileges or cause a denial of service (use-after-free) by making multiple bind system calls     without properly ascertaining whether a socket has the SOCK_ZAPPED status, related to net/l2tp/l2tp_ip.c     and net/l2tp/l2tp_ip6.c. (CVE-2016-10200)

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - It was discovered in the Linux kernel before 4.11-rc8 that root can gain direct access to an internal     keyring, such as '.dns_resolver' in RHEL-7 or '.builtin_trusted_keys' upstream, by joining it as its     session keyring. This allows root to bypass module signature verification by adding a new public key of     its own devising to the keyring. (CVE-2016-9604)

  - The __ip6_append_data function in net/ipv6/ip6_output.c in the Linux kernel through 4.11.3 is too late in     checking whether an overwrite of an skb data structure may occur, which allows local users to cause a     denial of service (system crash) via crafted system calls. (CVE-2017-9242)

  - Race condition in the fsnotify implementation in the Linux kernel through 4.12.4 allows local users to     gain privileges or cause a denial of service (memory corruption) via a crafted application that leverages     simultaneous execution of the inotify_handle_event and vfs_rename functions. (CVE-2017-7533)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Oracle Linux host is missing a security update for the kernel package(s).

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2017-1842 advisory.

  - The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the     CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which     allows local users to cause a denial of service (loss of writability) by making certain unshare system     calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call. (CVE-2014-7975)

  - The proc_keys_show function in security/keys/proc.c in the Linux kernel through 4.8.2, when the GNU     Compiler Collection (gcc) stack protector is enabled, uses an incorrect buffer size for certain timeout     data, which allows local users to cause a denial of service (stack memory corruption and panic) by reading     the /proc/keys file. (CVE-2016-7042)

  - Race condition in the netlink_dump function in net/netlink/af_netlink.c in the Linux kernel before 4.6.3     allows local users to cause a denial of service (double free) or possibly have unspecified other impact     via a crafted application that makes sendmsg system calls, leading to a free operation associated with a     new dump that started earlier than anticipated. (CVE-2016-9806)

  - The blk_rq_map_user_iov function in block/blk-map.c in the Linux kernel before 4.8.14 does not properly     restrict the type of iterator, which allows local users to read or write to arbitrary kernel memory     locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg device.
    (CVE-2016-9576)

  - The sg implementation in the Linux kernel through 4.9 does not properly restrict write operations in     situations where the KERNEL_DS option is set, which allows local users to read or write to arbitrary     kernel memory locations or cause a denial of service (use-after-free) by leveraging access to a /dev/sg     device, related to block/bsg.c and drivers/scsi/sg.c. NOTE: this vulnerability exists because of an     incomplete fix for CVE-2016-9576. (CVE-2016-10088)

  - The filesystem implementation in the Linux kernel through 4.8.2 preserves the setgid bit during a setxattr     call, which allows local users to gain group privileges by leveraging the existence of a setgid program     with restrictions on execute permissions. (CVE-2016-7097)

  - The sg_ioctl function in drivers/scsi/sg.c in the Linux kernel through 4.10.4 allows local users to cause     a denial of service (stack-based buffer overflow) or possibly have unspecified other impact via a large     command size in an SG_NEXT_CMD_LEN ioctl call, leading to out-of-bounds write access in the sg_write     function. (CVE-2017-7187)

  - crypto/mcryptd.c in the Linux kernel before 4.8.15 allows local users to cause a denial of service (NULL     pointer dereference and system crash) by using an AF_ALG socket with an incompatible algorithm, as     demonstrated by mcryptd(md5). (CVE-2016-10147)

  - arch/x86/kvm/vmx.c in the Linux kernel through 4.9 mismanages the #BP and #OF exceptions, which allows     guest OS users to cause a denial of service (guest OS crash) by declining to handle an exception thrown by     an L2 guest. (CVE-2016-9588)

  - The nested_vmx_check_vmptr function in arch/x86/kvm/vmx.c in the Linux kernel through 4.9.8 improperly     emulates the VMXON instruction, which allows KVM L1 guest OS users to cause a denial of service (host OS     memory consumption) by leveraging the mishandling of page references. (CVE-2017-2596)

  - The TCP stack in the Linux kernel before 4.8.10 mishandles skb truncation, which allows local users to     cause a denial of service (system crash) via a crafted application that makes sendto system calls, related     to net/ipv4/tcp_ipv4.c and net/ipv6/tcp_ipv6.c. (CVE-2016-8645)

  - The ipv4_pktinfo_prepare function in net/ipv4/ip_sockglue.c in the Linux kernel through 4.9.9 allows     attackers to cause a denial of service (system crash) via (1) an application that makes crafted system     calls or possibly (2) IPv4 traffic with invalid IP options. (CVE-2017-5970)

  - Race condition in kernel/events/core.c in the Linux kernel before 4.9.7 allows local users to gain     privileges via a crafted application that makes concurrent perf_event_open system calls for moving a     software group into a hardware context. NOTE: this vulnerability exists because of an incomplete fix for     CVE-2016-6786. (CVE-2017-6001)

  - The KEYS subsystem in the Linux kernel before 3.18 allows local users to gain privileges or cause a denial     of service (NULL pointer dereference and system crash) via vectors involving a NULL value for a certain     match field, related to the keyring_search_iterator function in keyring.c. (CVE-2017-2647)

  - The inet_csk_clone_lock function in net/ipv4/inet_connection_sock.c in the Linux kernel through 4.10.15     allows attackers to cause a denial of service (double free) or possibly have unspecified other impact by     leveraging use of the accept system call. (CVE-2017-8890)

  - The tcp_v6_syn_recv_sock function in net/ipv6/tcp_ipv6.c in the Linux kernel through 4.11.1 mishandles     inheritance, which allows local users to cause a denial of service or possibly have unspecified other     impact via crafted system calls, a related issue to CVE-2017-8890. (CVE-2017-9077)

  - The pivot_root implementation in fs/namespace.c in the Linux kernel through 3.17 does not properly     interact with certain locations of a chroot directory, which allows local users to cause a denial of     service (mount-tree loop) via . (dot) values in both arguments to the pivot_root system call.
    (CVE-2014-7970)

  - crypto/algif_skcipher.c in the Linux kernel before 4.4.2 does not verify that a setkey operation has been     performed on an AF_ALG socket before an accept system call is processed, which allows local users to cause     a denial of service (NULL pointer dereference and system crash) via a crafted application that does not     supply a key, related to the lrw_crypt function in crypto/lrw.c. (CVE-2015-8970)

  - Race condition in the L2TPv3 IP Encapsulation feature in the Linux kernel before 4.8.14 allows local users     to gain privileges or cause a denial of service (use-after-free) by making multiple bind system calls     without properly ascertaining whether a socket has the SOCK_ZAPPED status, related to net/l2tp/l2tp_ip.c     and net/l2tp/l2tp_ip6.c. (CVE-2016-10200)

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - It was discovered in the Linux kernel before 4.11-rc8 that root can gain direct access to an internal     keyring, such as '.dns_resolver' in RHEL-7 or '.builtin_trusted_keys' upstream, by joining it as its     session keyring. This allows root to bypass module signature verification by adding a new public key of     its own devising to the keyring. (CVE-2016-9604)

  - The ping_unhash function in net/ipv4/ping.c in the Linux kernel through 4.10.8 is too late in obtaining a     certain lock and consequently cannot ensure that disconnect function calls are safe, which allows local     users to cause a denial of service (panic) by leveraging access to the protocol value of IPPROTO_ICMP in a     socket system call. (CVE-2017-2671)

  - The keyring_search_aux function in security/keys/keyring.c in the Linux kernel through 3.14.79 allows     local users to cause a denial of service (NULL pointer dereference and OOPS) via a request_key system call     for the dead type. (CVE-2017-6951)

  - Incorrect error handling in the set_mempolicy and mbind compat syscalls in mm/mempolicy.c in the Linux     kernel through 4.10.9 allows local users to obtain sensitive information from uninitialized stack data by     triggering failure of a certain bitmap operation. (CVE-2017-7616)

  - The mm subsystem in the Linux kernel through 3.2 does not properly enforce the CONFIG_STRICT_DEVMEM     protection mechanism, which allows local users to read or write to kernel memory locations in the first     megabyte (and bypass slab-allocation access restrictions) via an application that opens the /dev/mem file,     related to arch/x86/mm/init.c and drivers/char/mem.c. (CVE-2017-7889)

  - The IPv6 fragmentation implementation in the Linux kernel through 4.11.1 does not consider that the     nexthdr field may be associated with an invalid option, which allows local users to cause a denial of     service (out-of-bounds read and BUG) or possibly have unspecified other impact via crafted socket and send     system calls. (CVE-2017-9074)

  - The dccp_v6_request_recv_sock function in net/dccp/ipv6.c in the Linux kernel through 4.11.1 mishandles     inheritance, which allows local users to cause a denial of service or possibly have unspecified other     impact via crafted system calls, a related issue to CVE-2017-8890. (CVE-2017-9076)

  - The __ip6_append_data function in net/ipv6/ip6_output.c in the Linux kernel through 4.11.3 is too late in     checking whether an overwrite of an skb data structure may occur, which allows local users to cause a     denial of service (system crash) via crafted system calls. (CVE-2017-9242)

  - Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local     users to cause a denial of service (disk corruption) by writing to a page that is associated with a     different user's file after unsynchronized hole punching and page-fault handling. (CVE-2015-8839)

  - Multiple memory leaks in error paths in fs/xfs/xfs_attr_list.c in the Linux kernel before 4.5.1 allow     local users to cause a denial of service (memory consumption) via crafted XFS filesystem operations.
    (CVE-2016-9685)

  - The NFSv4 server in the Linux kernel before 4.11.3 does not properly validate the layout type when     processing the NFSv4 pNFS GETDEVICEINFO or LAYOUTGET operand in a UDP packet from a remote attacker. This     type value is uninitialized upon encountering certain error conditions. This value is used as an array     index for dereferencing, which leads to an OOPS and eventually a DoS of knfsd and a soft-lockup of the     whole system. (CVE-2017-8797)

  - The sctp_v6_create_accept_sk function in net/sctp/ipv6.c in the Linux kernel through 4.11.1 mishandles     inheritance, which allows local users to cause a denial of service or possibly have unspecified other     impact via crafted system calls, a related issue to CVE-2017-8890. (CVE-2017-9075)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es) :

* An use-after-free flaw was found in the Linux kernel which enables a race condition in the L2TPv3 IP Encapsulation feature. A local user could use this flaw to escalate their privileges or crash the system.
(CVE-2016-10200, Important)

* A flaw was found that can be triggered in keyring_search_iterator in keyring.c if type->match is NULL. A local user could use this flaw to crash the system or, potentially, escalate their privileges.
(CVE-2017-2647, Important)

* It was found that the NFSv4 server in the Linux kernel did not properly validate layout type when processing NFSv4 pNFS LAYOUTGET and GETDEVICEINFO operands. A remote attacker could use this flaw to soft-lockup the system and thus cause denial of service.
(CVE-2017-8797, Important)

This update also fixes multiple Moderate and Low impact security issues :

* CVE-2015-8839, CVE-2015-8970, CVE-2016-9576, CVE-2016-7042, CVE-2016-7097, CVE-2016-8645, CVE-2016-9576, CVE-2016-9588, CVE-2016-9806, CVE-2016-10088, CVE-2016-10147, CVE-2017-2596, CVE-2017-2671, CVE-2017-5970, CVE-2017-6001, CVE-2017-6951, CVE-2017-7187, CVE-2017-7616, CVE-2017-7889, CVE-2017-8890, CVE-2017-9074, CVE-2017-8890, CVE-2017-9075, CVE-2017-8890, CVE-2017-9076, CVE-2017-8890, CVE-2017-9077, CVE-2017-9242, CVE-2014-7970, CVE-2014-7975, CVE-2016-6213, CVE-2016-9604, CVE-2016-9685

Documentation for these issues is available from the Release Notes document linked from the References section.

Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin (Virtuozzo) for reporting CVE-2017-2647; Igor Redko (Virtuozzo) and Vasily Averin (Virtuozzo) for reporting CVE-2015-8970; Marco Grassi for reporting CVE-2016-8645; and Dmitry Vyukov (Google Inc.) for reporting CVE-2017-2596. The CVE-2016-7042 issue was discovered by Ondrej Kozina (Red Hat); the CVE-2016-7097 issue was discovered by Andreas Gruenbacher (Red Hat) and Jan Kara (SUSE); the CVE-2016-6213 and CVE-2016-9685 issues were discovered by Qian Cai (Red Hat); and the CVE-2016-9604 issue was discovered by David Howells (Red Hat).

Additional Changes :

For detailed information on other changes in this release, see the Red Hat Enterprise Linux 7.4 Release Notes linked from the References section.

CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel's mount table. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-6213)

Andreas Gruenbacher and Jan Kara discovered that the filesystem implementation in the Linux kernel did not clear the setgid bit during a setxattr call. A local attacker could use this to possibly elevate group privileges. (CVE-2016-7097)

Marco Grassi discovered that the driver for Areca RAID Controllers in the Linux kernel did not properly validate control messages. A local attacker could use this to cause a denial of service (system crash) or possibly gain privileges. (CVE-2016-7425)

It was discovered that the KVM implementation for x86/x86_64 in the Linux kernel could dereference a NULL pointer. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the KVM host. (CVE-2016-8630)

Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation in the Linux kernel contained a buffer overflow when handling fragmented packets. A remote attacker could use this to possibly execute arbitrary code with administrative privileges.
(CVE-2016-8633)

Marco Grassi discovered that the TCP implementation in the Linux kernel mishandles socket buffer (skb) truncation. A local attacker could use this to cause a denial of service (system crash).
(CVE-2016-8645)

It was discovered that the keyring implementation in the Linux kernel improperly handled crypto registration in conjunction with successful key- type registration. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-9313)

Andrey Konovalov discovered that the SCTP implementation in the Linux kernel improperly handled validation of incoming data. A remote attacker could use this to cause a denial of service (system crash).
(CVE-2016-9555).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel's mount table. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-6213)

It was discovered that the KVM implementation for x86/x86_64 in the Linux kernel could dereference a NULL pointer. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the KVM host. (CVE-2016-8630)

Eyal Itkin discovered that the IP over IEEE 1394 (FireWire) implementation in the Linux kernel contained a buffer overflow when handling fragmented packets. A remote attacker could use this to possibly execute arbitrary code with administrative privileges.
(CVE-2016-8633)

Marco Grassi discovered that the TCP implementation in the Linux kernel mishandles socket buffer (skb) truncation. A local attacker could use this to cause a denial of service (system crash).
(CVE-2016-8645)

It was discovered that the keyring implementation in the Linux kernel improperly handled crypto registration in conjunction with successful key- type registration. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-9313)

Andrey Konovalov discovered that the SCTP implementation in the Linux kernel improperly handled validation of incoming data. A remote attacker could use this to cause a denial of service (system crash).
(CVE-2016-9555).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3161-4 advisory.

  - The tty_set_termios_ldisc function in drivers/tty/tty_ldisc.c in the Linux kernel before 4.5 allows local     users to obtain sensitive information from kernel memory by reading a tty data structure. (CVE-2015-8964)

  - drivers/media/v4l2-core/videobuf2-v4l2.c in the Linux kernel before 4.5.3 allows local users to cause a     denial of service (kernel memory write operation) or possibly have unspecified other impact via a crafted     number of planes in a VIDIOC_DQBUF ioctl call. (CVE-2016-4568)

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - The filesystem implementation in the Linux kernel through 4.8.2 preserves the setgid bit during a setxattr     call, which allows local users to gain group privileges by leveraging the existence of a setgid program     with restrictions on execute permissions. (CVE-2016-7097)

  - The arcmsr_iop_message_xfer function in drivers/scsi/arcmsr/arcmsr_hba.c in the Linux kernel through 4.8.2     does not restrict a certain length field, which allows local users to gain privileges or cause a denial of     service (heap-based buffer overflow) via an ARCMSR_MESSAGE_WRITE_WQBUFFER control code. (CVE-2016-7425)

  - The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is     enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M     byte in an undefined instruction. (CVE-2016-8630)

  - drivers/firewire/net.c in the Linux kernel before 4.8.7, in certain unusual hardware configurations,     allows remote attackers to execute arbitrary code via crafted fragmented packets. (CVE-2016-8633)

  - The TCP stack in the Linux kernel before 4.8.10 mishandles skb truncation, which allows local users to     cause a denial of service (system crash) via a crafted application that makes sendto system calls, related     to net/ipv4/tcp_ipv4.c and net/ipv6/tcp_ipv6.c. (CVE-2016-8645)

  - Stack-based buffer overflow in the brcmf_cfg80211_start_ap function in     drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the Linux kernel before 4.7.5 allows local     users to cause a denial of service (system crash) or possibly have unspecified other impact via a long     SSID Information Element in a command to a Netlink socket. (CVE-2016-8658)

  - The sctp_sf_ootb function in net/sctp/sm_statefuns.c in the Linux kernel before 4.8.8 lacks chunk-length     checking for the first chunk, which allows remote attackers to cause a denial of service (out-of-bounds     slab access) or possibly have unspecified other impact via crafted SCTP data. (CVE-2016-9555)

  - The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28     contains extended asm statements that are incompatible with the exception table, which allows local users     to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists     because of incorrect backporting of the CVE-2016-9178 patch to older kernels. (CVE-2016-9644)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3161-3 advisory.

  - The tty_set_termios_ldisc function in drivers/tty/tty_ldisc.c in the Linux kernel before 4.5 allows local     users to obtain sensitive information from kernel memory by reading a tty data structure. (CVE-2015-8964)

  - drivers/media/v4l2-core/videobuf2-v4l2.c in the Linux kernel before 4.5.3 allows local users to cause a     denial of service (kernel memory write operation) or possibly have unspecified other impact via a crafted     number of planes in a VIDIOC_DQBUF ioctl call. (CVE-2016-4568)

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - The proc_keys_show function in security/keys/proc.c in the Linux kernel through 4.8.2, when the GNU     Compiler Collection (gcc) stack protector is enabled, uses an incorrect buffer size for certain timeout     data, which allows local users to cause a denial of service (stack memory corruption and panic) by reading     the /proc/keys file. (CVE-2016-7042)

  - The filesystem implementation in the Linux kernel through 4.8.2 preserves the setgid bit during a setxattr     call, which allows local users to gain group privileges by leveraging the existence of a setgid program     with restrictions on execute permissions. (CVE-2016-7097)

  - The arcmsr_iop_message_xfer function in drivers/scsi/arcmsr/arcmsr_hba.c in the Linux kernel through 4.8.2     does not restrict a certain length field, which allows local users to gain privileges or cause a denial of     service (heap-based buffer overflow) via an ARCMSR_MESSAGE_WRITE_WQBUFFER control code. (CVE-2016-7425)

  - The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is     enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M     byte in an undefined instruction. (CVE-2016-8630)

  - drivers/firewire/net.c in the Linux kernel before 4.8.7, in certain unusual hardware configurations,     allows remote attackers to execute arbitrary code via crafted fragmented packets. (CVE-2016-8633)

  - The TCP stack in the Linux kernel before 4.8.10 mishandles skb truncation, which allows local users to     cause a denial of service (system crash) via a crafted application that makes sendto system calls, related     to net/ipv4/tcp_ipv4.c and net/ipv6/tcp_ipv6.c. (CVE-2016-8645)

  - Stack-based buffer overflow in the brcmf_cfg80211_start_ap function in     drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c in the Linux kernel before 4.7.5 allows local     users to cause a denial of service (system crash) or possibly have unspecified other impact via a long     SSID Information Element in a command to a Netlink socket. (CVE-2016-8658)

  - The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not     initialize a certain integer variable, which allows local users to obtain sensitive information from     kernel stack memory by triggering failure of a get_user_ex call. (CVE-2016-9178)

  - The sctp_sf_ootb function in net/sctp/sm_statefuns.c in the Linux kernel before 4.8.8 lacks chunk-length     checking for the first chunk, which allows remote attackers to cause a denial of service (out-of-bounds     slab access) or possibly have unspecified other impact via crafted SCTP data. (CVE-2016-9555)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3161-2 advisory.

  - The tty_set_termios_ldisc function in drivers/tty/tty_ldisc.c in the Linux kernel before 4.5 allows local     users to obtain sensitive information from kernel memory by reading a tty data structure. (CVE-2015-8964)

  - drivers/media/v4l2-core/videobuf2-v4l2.c in the Linux kernel before 4.5.3 allows local users to cause a     denial of service (kernel memory write operation) or possibly have unspecified other impact via a crafted     number of planes in a VIDIOC_DQBUF ioctl call. (CVE-2016-4568)

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is     enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M     byte in an undefined instruction. (CVE-2016-8630)

  - drivers/firewire/net.c in the Linux kernel before 4.8.7, in certain unusual hardware configurations,     allows remote attackers to execute arbitrary code via crafted fragmented packets. (CVE-2016-8633)

  - The TCP stack in the Linux kernel before 4.8.10 mishandles skb truncation, which allows local users to     cause a denial of service (system crash) via a crafted application that makes sendto system calls, related     to net/ipv4/tcp_ipv4.c and net/ipv6/tcp_ipv6.c. (CVE-2016-8645)

  - The sctp_sf_ootb function in net/sctp/sm_statefuns.c in the Linux kernel before 4.8.8 lacks chunk-length     checking for the first chunk, which allows remote attackers to cause a denial of service (out-of-bounds     slab access) or possibly have unspecified other impact via crafted SCTP data. (CVE-2016-9555)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3161-1 advisory.

  - The tty_set_termios_ldisc function in drivers/tty/tty_ldisc.c in the Linux kernel before 4.5 allows local     users to obtain sensitive information from kernel memory by reading a tty data structure. (CVE-2015-8964)

  - drivers/media/v4l2-core/videobuf2-v4l2.c in the Linux kernel before 4.5.3 allows local users to cause a     denial of service (kernel memory write operation) or possibly have unspecified other impact via a crafted     number of planes in a VIDIOC_DQBUF ioctl call. (CVE-2016-4568)

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - The x86_decode_insn function in arch/x86/kvm/emulate.c in the Linux kernel before 4.8.7, when KVM is     enabled, allows local users to cause a denial of service (host OS crash) via a certain use of a ModR/M     byte in an undefined instruction. (CVE-2016-8630)

  - drivers/firewire/net.c in the Linux kernel before 4.8.7, in certain unusual hardware configurations,     allows remote attackers to execute arbitrary code via crafted fragmented packets. (CVE-2016-8633)

  - The TCP stack in the Linux kernel before 4.8.10 mishandles skb truncation, which allows local users to     cause a denial of service (system crash) via a crafted application that makes sendto system calls, related     to net/ipv4/tcp_ipv4.c and net/ipv6/tcp_ipv6.c. (CVE-2016-8645)

  - The sctp_sf_ootb function in net/sctp/sm_statefuns.c in the Linux kernel before 4.8.8 lacks chunk-length     checking for the first chunk, which allows remote attackers to cause a denial of service (out-of-bounds     slab access) or possibly have unspecified other impact via crafted SCTP data. (CVE-2016-9555)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

USN-3160-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 LTS.

CAI Qian discovered that shared bind mounts in a mount namespace exponentially added entries without restriction to the Linux kernel's mount table. A local attacker could use this to cause a denial of service (system crash). (CVE-2016-6213)

It was discovered that a race condition existed in the procfs environ_read function in the Linux kernel, leading to an integer underflow. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2016-7916).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-3160-1 advisory.

  - fs/namespace.c in the Linux kernel before 4.9 does not restrict how many mounts may exist in a mount     namespace, which allows local users to cause a denial of service (memory consumption and deadlock) via     MS_BIND mount system calls, as demonstrated by a loop that triggers exponential growth in the number of     mounts. (CVE-2016-6213)

  - Race condition in the environ_read function in fs/proc/base.c in the Linux kernel before 4.5.4 allows     local users to obtain sensitive information from kernel memory by reading a /proc/*/environ file during a     process-setup time interval in which environment-variable copying is incomplete. (CVE-2016-7916)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
124837	EulerOS Virtualization for ARM 64 3.0.1.0 : kernel (EulerOS-SA-2019-1516)	Nessus	Huawei Local Security Checks	critical
106469	OracleVM 3.4 : Unbreakable / etc (OVMSA-2018-0015) (BlueBorne) (Meltdown) (Spectre) (Stack Clash)	Nessus	OracleVM Local Security Checks	critical
105248	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0174) (BlueBorne) (Dirty COW) (Stack Clash)	Nessus	OracleVM Local Security Checks	high
105247	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2017-3659)	Nessus	Oracle Linux Local Security Checks	high
102774	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0145) (Stack Clash)	Nessus	OracleVM Local Security Checks	critical
102773	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2017-3609)	Nessus	Oracle Linux Local Security Checks	critical
102734	CentOS 7 : kernel (CESA-2017:1842) (Stack Clash)	Nessus	CentOS Local Security Checks	high
102645	Scientific Linux Security Update : kernel on SL7.x x86_64 (20170801)	Nessus	Scientific Linux Local Security Checks	high
102573	OracleVM 3.4 : Unbreakable / etc (OVMSA-2017-0143)	Nessus	OracleVM Local Security Checks	high
102572	Oracle Linux 6 / 7 : Unbreakable Enterprise kernel (ELSA-2017-3605)	Nessus	Oracle Linux Local Security Checks	high
102511	Oracle Linux 7 : kernel (ELSA-2017-1842-1) (Stack Clash)	Nessus	Oracle Linux Local Security Checks	critical
102281	Oracle Linux 7 : kernel (ELSA-2017-1842)	Nessus	Oracle Linux Local Security Checks	high
102151	RHEL 7 : kernel-rt (RHSA-2017:2077)	Nessus	Red Hat Local Security Checks	high
102143	RHEL 7 : kernel (RHSA-2017:1842) (Stack Clash)	Nessus	Red Hat Local Security Checks	high
96000	Ubuntu 16.10 : linux-raspi2 vulnerabilities (USN-3162-2)	Nessus	Ubuntu Local Security Checks	critical
95999	Ubuntu 16.10 : linux vulnerabilities (USN-3162-1)	Nessus	Ubuntu Local Security Checks	critical
95998	Ubuntu 16.04 LTS : Linux kernel (Qualcomm Snapdragon) vulnerabilities (USN-3161-4)	Nessus	Ubuntu Local Security Checks	critical
95997	Ubuntu 16.04 LTS : Linux kernel (Raspberry Pi 2) vulnerabilities (USN-3161-3)	Nessus	Ubuntu Local Security Checks	critical
95996	Ubuntu 14.04 LTS : Linux kernel (Xenial HWE) vulnerabilities (USN-3161-2)	Nessus	Ubuntu Local Security Checks	critical
95995	Ubuntu 16.04 LTS : Linux kernel vulnerabilities (USN-3161-1)	Nessus	Ubuntu Local Security Checks	critical
95994	Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-3160-2)	Nessus	Ubuntu Local Security Checks	medium
95993	Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-3160-1)	Nessus	Ubuntu Local Security Checks	medium

Detections

Analytics

CVE-2016-6213

medium

Tenable Plugins

critical

critical

high

high

critical

critical

high

high

high

high

critical

high

high

high

critical

critical

critical

critical

critical

critical

medium

medium