RHSA-2016:1033

RHSA-2016:2574

92123

http://www-01.ibm.com/support/docview.wss?uid=isg3T1023969

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) :

* It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call. (CVE-2016-3841, Important)

* Several Moderate and Low impact security issues were found in the Linux kernel. Space precludes documenting each of these issues in this advisory. Refer to the CVE links in the References section for a description of each of these vulnerabilities. (CVE-2013-4312, CVE-2015-8374, CVE-2015-8543, CVE-2015-8812, CVE-2015-8844, CVE-2015-8845, CVE-2016-2053, CVE-2016-2069, CVE-2016-2847, CVE-2016-3156, CVE-2016-4581, CVE-2016-4794, CVE-2016-5412, CVE-2016-5828, CVE-2016-5829, CVE-2016-6136, CVE-2016-6198, CVE-2016-6327, CVE-2016-6480, CVE-2015-8746, CVE-2015-8956, CVE-2016-2117, CVE-2016-2384, CVE-2016-3070, CVE-2016-3699, CVE-2016-4569, CVE-2016-4578)

Red Hat would like to thank Philip Pettersson (Samsung) for reporting CVE-2016-2053; Tetsuo Handa for reporting CVE-2016-2847; the Virtuozzo kernel team and Solar Designer (Openwall) for reporting CVE-2016-3156;
Justin Yackoski (Cryptonite) for reporting CVE-2016-2117; and Linn Crosetto (HP) for reporting CVE-2016-3699. The CVE-2015-8812 issue was discovered by Venkatesh Pottem (Red Hat Engineering); the CVE-2015-8844 and CVE-2015-8845 issues were discovered by Miroslav Vadkerti (Red Hat Engineering); the CVE-2016-4581 issue was discovered by Eric W. Biederman (Red Hat); the CVE-2016-6198 issue was discovered by CAI Qian (Red Hat); and the CVE-2016-3070 issue was discovered by Jan Stancek (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.3 Release Notes linked from the References section.

The remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2016-2574 advisory.

  - The Linux kernel before 4.4.1 allows local users to bypass file-descriptor limits and cause a denial of     service (memory consumption) by sending each descriptor over a UNIX socket before closing it, related to     net/unix/af_unix.c and net/unix/garbage.c. (CVE-2013-4312)

  - The networking implementation in the Linux kernel through 4.3.3, as used in Android and other products,     does not validate protocol identifiers for certain protocol families, which allows local users to cause a     denial of service (NULL function pointer dereference and system crash) or possibly gain privileges by     leveraging CLONE_NEWUSER support to execute a crafted SOCK_RAW application. (CVE-2015-8543)

  - The atl2_probe function in drivers/net/ethernet/atheros/atlx/atl2.c in the Linux kernel through 4.5.2     incorrectly enables scatter/gather I/O, which allows remote attackers to obtain sensitive information from     kernel memory by reading packet data. (CVE-2016-2117)

  - The filesystem layer in the Linux kernel before 4.5.5 proceeds with post-rename operations after an     OverlayFS file is renamed to a self-hardlink, which allows local users to cause a denial of service     (system crash) via a rename system call, related to fs/namei.c and fs/open.c. (CVE-2016-6198)

  - Race condition in arch/x86/mm/tlb.c in the Linux kernel before 4.4.1 allows local users to gain privileges     by triggering access to a paging structure by a different CPU. (CVE-2016-2069)

  - The IPv4 implementation in the Linux kernel before 4.5.2 mishandles destruction of device objects, which     allows guest OS users to cause a denial of service (host OS networking outage) by arranging for a large     number of IP addresses. (CVE-2016-3156)

  - fs/pnode.c in the Linux kernel before 4.5.4 does not properly traverse a mount propagation tree in a     certain case involving a slave mount, which allows local users to cause a denial of service (NULL pointer     dereference and OOPS) via a crafted series of mount system calls. (CVE-2016-4581)

  - fs/pipe.c in the Linux kernel before 4.5 does not limit the amount of unread data in pipes, which allows     local users to cause a denial of service (memory consumption) by creating many pipes with non-default     sizes. (CVE-2016-2847)

  - fs/btrfs/inode.c in the Linux kernel before 4.3.3 mishandles compressed inline extents, which allows local     users to obtain sensitive pre-truncation information from a file via a clone action. (CVE-2015-8374)

  - Multiple heap-based buffer overflows in the hiddev_ioctl_usage function in drivers/hid/usbhid/hiddev.c in     the Linux kernel through 4.6.3 allow local users to cause a denial of service or possibly have unspecified     other impact via a crafted (1) HIDIOCGUSAGES or (2) HIDIOCSUSAGES ioctl call. (CVE-2016-5829)

  - The signal implementation in the Linux kernel before 4.3.5 on powerpc platforms does not check for an MSR     with both the S and T bits set, which allows local users to cause a denial of service (TM Bad Thing     exception and panic) via a crafted application. (CVE-2015-8844)

  - The tm_reclaim_thread function in arch/powerpc/kernel/process.c in the Linux kernel before 4.4.1 on     powerpc platforms does not ensure that TM suspend mode exists before proceeding with a tm_reclaim call,     which allows local users to cause a denial of service (TM Bad Thing exception and panic) via a crafted     application. (CVE-2015-8845)

  - The rfcomm_sock_bind function in net/bluetooth/rfcomm/sock.c in the Linux kernel before 4.2 allows local     users to obtain sensitive information or cause a denial of service (NULL pointer dereference) via vectors     involving a bind system call on a Bluetooth RFCOMM socket. (CVE-2015-8956)

  - The asn1_ber_decoder function in lib/asn1_decoder.c in the Linux kernel before 4.3 allows attackers to     cause a denial of service (panic) via an ASN.1 BER file that lacks a public key, leading to mishandling by     the public_key_verify_signature function in crypto/asymmetric_keys/public_key.c. (CVE-2016-2053)

  - Double free vulnerability in the snd_usbmidi_create function in sound/usb/midi.c in the Linux kernel     before 4.5 allows physically proximate attackers to cause a denial of service (panic) or possibly have     unspecified other impact via vectors involving an invalid USB descriptor. (CVE-2016-2384)

  - The snd_timer_user_params function in sound/core/timer.c in the Linux kernel through 4.6 does not     initialize a certain data structure, which allows local users to obtain sensitive information from kernel     stack memory via crafted use of the ALSA timer interface. (CVE-2016-4569)

  - sound/core/timer.c in the Linux kernel through 4.6 does not initialize certain r1 data structures, which     allows local users to obtain sensitive information from kernel stack memory via crafted use of the ALSA     timer interface, related to the (1) snd_timer_user_ccallback and (2) snd_timer_user_tinterrupt functions.
    (CVE-2016-4578)

  - arch/powerpc/kvm/book3s_hv_rmhandlers.S in the Linux kernel through 4.7 on PowerPC platforms, when     CONFIG_KVM_BOOK3S_64_HV is enabled, allows guest OS users to cause a denial of service (host OS infinite     loop) by making a H_CEDE hypercall during the existence of a suspended transaction. (CVE-2016-5412)

  - drivers/infiniband/ulp/srpt/ib_srpt.c in the Linux kernel before 4.5.1 allows local users to cause a     denial of service (NULL pointer dereference and system crash) by using an ABORT_TASK command to abort a     device write operation. (CVE-2016-6327)

  - Race condition in the ioctl_send_fib function in drivers/scsi/aacraid/commctrl.c in the Linux kernel     through 4.7 allows local users to cause a denial of service (out-of-bounds access or system crash) by     changing a certain size value, aka a double fetch vulnerability. (CVE-2016-6480)

  - fs/nfs/nfs4proc.c in the NFS client in the Linux kernel before 4.2.2 does not properly initialize memory     for migration recovery operations, which allows remote NFS servers to cause a denial of service (NULL     pointer dereference and panic) via crafted network traffic. (CVE-2015-8746)

  - drivers/infiniband/hw/cxgb3/iwch_cm.c in the Linux kernel before 4.5 does not properly identify error     conditions, which allows remote attackers to execute arbitrary code or cause a denial of service (use-     after-free) via crafted packets. (CVE-2015-8812)

  - The trace_writeback_dirty_page implementation in include/trace/events/writeback.h in the Linux kernel     before 4.4 improperly interacts with mm/migrate.c, which allows local users to cause a denial of service     (NULL pointer dereference and system crash) or possibly have unspecified other impact by triggering a     certain page move. (CVE-2016-3070)

  - The Linux kernel, as used in Red Hat Enterprise Linux 7.2 and Red Hat Enterprise MRG 2 and when booted     with UEFI Secure Boot enabled, allows local users to bypass intended Secure Boot restrictions and execute     untrusted code by appending ACPI tables to the initrd. (CVE-2016-3699)

  - The IPv6 stack in the Linux kernel before 4.3.3 mishandles options data, which allows local users to gain     privileges or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system     call. (CVE-2016-3841)

  - Use-after-free vulnerability in mm/percpu.c in the Linux kernel through 4.6 allows local users to cause a     denial of service (BUG) or possibly have unspecified other impact via crafted use of the mmap and bpf     system calls. (CVE-2016-4794)

  - The start_thread function in arch/powerpc/kernel/process.c in the Linux kernel through 4.6.3 on powerpc     platforms mishandles transactional state, which allows local users to cause a denial of service (invalid     process state or TM Bad Thing exception, and system crash) or possibly have unspecified other impact by     starting and suspending a transaction before an exec system call. (CVE-2016-5828)

  - Race condition in the audit_log_single_execve_arg function in kernel/auditsc.c in the Linux kernel through     4.7 allows local users to bypass intended character-set restrictions or disrupt system-call auditing by     changing a certain string, aka a double fetch vulnerability. (CVE-2016-6136)

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) :

* A flaw was found in the way the Linux kernel's ASN.1 DER decoder processed certain certificate files with tags of indefinite length. A local, unprivileged user could use a specially crafted X.509 certificate DER file to crash the system or, potentially, escalate their privileges on the system. (CVE-2016-0758, Important)

Red Hat would like to thank Philip Pettersson of Samsung for reporting this issue.

Bug Fix(es) :

* Under certain conditions, the migration threads could race with the CPU hotplug, which could cause a deadlock. A set of patches has been provided to fix this bug, and the deadlock no longer occurs in the system. (BZ# 1299338)

* A bug in the code that cleans up revoked delegations could previously cause a soft lockup in the NFS server. This patch fixes the underlying source code, so the lockup no longer occurs. (BZ#1311582)

* The second attempt to reload Common Application Programming Interface (CAPI) devices on the little-endian variant of IBM Power Systems previously failed. The provided set of patches fixes this bug, and reloading works as intended. (BZ#1312396)

* Due to inconsistencies in page size of IOMMU, the NVMe device, and the kernel, the BUG_ON signal previously occurred in the nvme_setup_prps() function, leading to the system crash while setting up the DMA transfer. The provided patch sets the default NVMe page size to 4k, thus preventing the system crash. (BZ#1312399)

* Previously, on a system using the Infiniband mlx5 driver used for the SRP stack, a hard lockup previously occurred after the kernel exceeded time with lock held with interrupts blocked. As a consequence, the system panicked. This update fixes this bug, and the system no longer panics in this situation. (BZ#1313814)

* On the little-endian variant of IBM Power Systems, the kernel previously crashed in the bitmap_weight() function while running the memory affinity script. The provided patch fortifies the topology setup and prevents sd-> child from being set to NULL when it is already NULL. As a result, the memory affinity script runs successfully. (BZ#1316158)

* When a KVM guest wrote random values to the special-purpose registers (SPR) Instruction Authority Mask Register (IAMR), the guest and the corresponding QEMU process previously hung. This update adds the code which sets SPRs to a suitable neutral value on guest exit, thus fixing this bug. (BZ#1316636)

* Under heavy iSCSI traffic load, the system previously panicked due to a race in the locking code leading to a list corruption. This update fixes this bug, and the system no longer panics in this situation. (BZ#1316812)

* During SCSI exception handling (triggered by some irregularities), the driver could previously use an already retired SCSI command. As a consequence, a kernel panic or data corruption occurred. The provided patches fix this bug, and exception handling now proceeds successfully. (BZ #1316820)

* When the previously opened /dev/tty, which pointed to a pseudo terminal (pty) pair, was the last file closed, a kernel crash could previously occur. The underlying source code has been fixed, preventing this bug. (BZ# 1320297)

* Previously, when using VPLEX and FCoE via the bnx2fc driver, different degrees of data corruption occurred. The provided patch fixes the FCP Response (RSP) residual parsing in bnx2fc, which prevents the aforementioned corruption. (BZ#1322279)

The remote Oracle Linux 7 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2016-1033 advisory.

  - Integer overflow in lib/asn1_decoder.c in the Linux kernel before 4.6 allows local users to gain     privileges via crafted ASN.1 data. (CVE-2016-0758)

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

ID	Name	Product	Family	Severity
95321	CentOS 7 : kernel (CESA-2016:2574)	Nessus	CentOS Local Security Checks	critical
94697	Oracle Linux 7 : kernel (ELSA-2016-2574)	Nessus	Oracle Linux Local Security Checks	critical
94537	RHEL 7 : kernel (RHSA-2016:2574)	Nessus	Red Hat Local Security Checks	critical
91114	RHEL 7 : kernel (RHSA-2016:1033)	Nessus	Red Hat Local Security Checks	high
91112	Oracle Linux 7 : kernel (ELSA-2016-1033)	Nessus	Oracle Linux Local Security Checks	high
91105	CentOS 7 : kernel (CESA-2016:1033)	Nessus	CentOS Local Security Checks	high

CVE-2016-3044

medium

Tenable Plugins

critical

critical

critical

high

high

high