An update for kernel is now available for Red Hat Enterprise Linux 5.

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 race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system. (CVE-2016-5195, Important)

* It was found that stacking a file system over procfs in the Linux kernel could lead to a kernel stack overflow due to deep nesting, as demonstrated by mounting ecryptfs over procfs and creating a recursion by mapping /proc/environ. An unprivileged, local user could potentially use this flaw to escalate their privileges on the system.
(CVE-2016-1583, Important)

Red Hat would like to thank Phil Oester for reporting CVE-2016-5195.

Bug Fix(es) :

* In some cases, a kernel crash or file system corruption occurred when running journal mode 'ordered'. The kernel crash was caused by a NULL pointer dereference due to a race condition between two journal functions. The file system corruption occurred due to a race condition between the do_get_write_access() function and buffer writeout. This update fixes both race conditions. As a result, neither the kernel crash, nor the file system corruption now occur. (BZ#1067708)

* Prior to this update, some Global File System 2 (GFS2) files had incorrect time stamp values due to two problems with handling time stamps of such files. The first problem concerned the atime time stamp, which ended up with an arbitrary value ahead of the actual value, when a GFS2 file was accessed. The second problem was related to the mtime and ctime time stamp updates, which got lost when a GFS2 file was written to from one node and read from or written to from another node. With this update, a set of patches has been applied that fix these problems. As a result, the time stamps of GFS2 files are now handled correctly. (BZ#1374861)

Security Fix(es) :

  - A race condition was found in the way the Linux kernel's     memory subsystem handled the copy-on-write (COW)     breakage of private read-only memory mappings. An     unprivileged, local user could use this flaw to gain     write access to otherwise read-only memory mappings and     thus increase their privileges on the system.
    (CVE-2016-5195, Important)

  - It was found that stacking a file system over procfs in     the Linux kernel could lead to a kernel stack overflow     due to deep nesting, as demonstrated by mounting     ecryptfs over procfs and creating a recursion by mapping     /proc/environ. An unprivileged, local user could     potentially use this flaw to escalate their privileges     on the system. (CVE-2016-1583, Important)

Bug Fix(es) :

  - In some cases, a kernel crash or file system corruption     occurred when running journal mode 'ordered'. The kernel     crash was caused by a NULL pointer dereference due to a     race condition between two journal functions. The file     system corruption occurred due to a race condition     between the do_get_write_access() function and buffer     writeout. This update fixes both race conditions. As a     result, neither the kernel crash, nor the file system     corruption now occur.

  - Prior to this update, some Global File System 2 (GFS2)     files had incorrect time stamp values due to two     problems with handling time stamps of such files. The     first problem concerned the atime time stamp, which     ended up with an arbitrary value ahead of the actual     value, when a GFS2 file was accessed. The second problem     was related to the mtime and ctime time stamp updates,     which got lost when a GFS2 file was written to from one     node and read from or written to from another node. With     this update, a set of patches has been applied that fix     these problems. As a result, the time stamps of GFS2     files are now handled correctly.

Justin Yackoski discovered that the Atheros L2 Ethernet Driver in the Linux kernel incorrectly enables scatter/gather I/O. A remote attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-2117)

Jann Horn discovered that eCryptfs improperly attempted to use the mmap() handler of a lower filesystem that did not implement one, causing a recursive page fault to occur. A local unprivileged attacker could use to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges. (CVE-2016-1583)

Jason A. Donenfeld discovered multiple out-of-bounds reads in the OZMO USB over wifi device drivers in the Linux kernel. A remote attacker could use this to cause a denial of service (system crash) or obtain potentially sensitive information from kernel memory. (CVE-2015-4004)

Ralf Spenneberg discovered that the Linux kernel's GTCO digitizer USB device driver did not properly validate endpoint descriptors. An attacker with physical access could use this to cause a denial of service (system crash). (CVE-2016-2187)

Hector Marco and Ismael Ripoll discovered that the Linux kernel would improperly disable Address Space Layout Randomization (ASLR) for x86 processes running in 32 bit mode if stack-consumption resource limits were disabled. A local attacker could use this to make it easier to exploit an existing vulnerability in a setuid/setgid program.
(CVE-2016-3672)

Andrey Konovalov discovered that the CDC Network Control Model USB driver in the Linux kernel did not cancel work events queued if a later error occurred, resulting in a use-after-free. An attacker with physical access could use this to cause a denial of service (system crash). (CVE-2016-3951)

It was discovered that an out-of-bounds write could occur when handling incoming packets in the USB/IP implementation in the Linux kernel. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-3955)

Vitaly Kuznetsov discovered that the Linux kernel did not properly suppress hugetlbfs support in X86 paravirtualized guests. An attacker in the guest OS could cause a denial of service (guest system crash).
(CVE-2016-3961)

Kangjie Lu discovered an information leak in the ANSI/IEEE 802.2 LLC type 2 Support implementations in the Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-4485)

Kangjie Lu discovered an information leak in the routing netlink socket interface (rtnetlink) implementation in the Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-4486)

Jann Horn discovered that the InfiniBand interfaces within the Linux kernel could be coerced into overwriting kernel memory. A local unprivileged attacker could use this to possibly gain administrative privileges on systems where InifiniBand related kernel modules are loaded. (CVE-2016-4565)

It was discovered that in some situations the Linux kernel did not handle propagated mounts correctly. A local unprivileged attacker could use this to cause a denial of service (system crash).
(CVE-2016-4581).

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.

Justin Yackoski discovered that the Atheros L2 Ethernet Driver in the Linux kernel incorrectly enables scatter/gather I/O. A remote attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-2117)

Jann Horn discovered that eCryptfs improperly attempted to use the mmap() handler of a lower filesystem that did not implement one, causing a recursive page fault to occur. A local unprivileged attacker could use to cause a denial of service (system crash) or possibly execute arbitrary code with administrative privileges. (CVE-2016-1583)

Jason A. Donenfeld discovered multiple out-of-bounds reads in the OZMO USB over wifi device drivers in the Linux kernel. A remote attacker could use this to cause a denial of service (system crash) or obtain potentially sensitive information from kernel memory. (CVE-2015-4004)

Andy Lutomirski discovered a race condition in the Linux kernel's translation lookaside buffer (TLB) handling of flush events. A local attacker could use this to cause a denial of service or possibly leak sensitive information. (CVE-2016-2069)

Ralf Spenneberg discovered that the Linux kernel's GTCO digitizer USB device driver did not properly validate endpoint descriptors. An attacker with physical access could use this to cause a denial of service (system crash). (CVE-2016-2187)

Hector Marco and Ismael Ripoll discovered that the Linux kernel would improperly disable Address Space Layout Randomization (ASLR) for x86 processes running in 32 bit mode if stack-consumption resource limits were disabled. A local attacker could use this to make it easier to exploit an existing vulnerability in a setuid/setgid program.
(CVE-2016-3672)

Andrey Konovalov discovered that the CDC Network Control Model USB driver in the Linux kernel did not cancel work events queued if a later error occurred, resulting in a use-after-free. An attacker with physical access could use this to cause a denial of service (system crash). (CVE-2016-3951)

It was discovered that an out-of-bounds write could occur when handling incoming packets in the USB/IP implementation in the Linux kernel. A remote attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2016-3955)

Kangjie Lu discovered an information leak in the ANSI/IEEE 802.2 LLC type 2 Support implementations in the Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-4485)

Kangjie Lu discovered an information leak in the routing netlink socket interface (rtnetlink) implementation in the Linux kernel. A local attacker could use this to obtain potentially sensitive information from kernel memory. (CVE-2016-4486)

It was discovered that in some situations the Linux kernel did not handle propagated mounts correctly. A local unprivileged attacker could use this to cause a denial of service (system crash).
(CVE-2016-4581).

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.

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

  - Array index error in the tcm_vhost_make_tpg function in     drivers/vhost/scsi.c in the Linux kernel before 4.0     might allow guest OS users to cause a denial of service     (memory corruption) or possibly have unspecified other     impact via a crafted VHOST_SCSI_SET_ENDPOINT ioctl     call. NOTE: the affected function was renamed to     vhost_scsi_make_tpg before the vulnerability was     announced.(CVE-2015-4036)

  - The ecryptfs_privileged_open function in     fs/ecryptfs/kthread.c in the Linux kernel before 4.6.3     allows local users to gain privileges or cause a denial     of service (stack memory consumption) via vectors     involving crafted mmap calls for /proc pathnames,     leading to recursive pagefault handling.(CVE-2016-1583)

  - It was found that SCSI driver in the Linux kernel can     improperly access userspace memory outside the provided     buffer. A local privileged attacker could potentially     use this flaw to expose information from the kernel     memory.(CVE-2017-13168)

  - The acpi_ds_create_operands() function in     drivers/acpi/acpica/dsutils.c in the Linux kernel     through 4.12.9 does not flush the operand cache and     causes a kernel stack dump, which allows local users to     obtain sensitive information from kernel memory and     bypass the KASLR protection mechanism (in the kernel     through 4.9) via a crafted ACPI table.(CVE-2017-13693)

  - The acpi_ps_complete_final_op() function in     drivers/acpi/acpica/psobject.c in the Linux kernel     through 4.12.9 does not flush the node and node_ext     caches and causes a kernel stack dump, which allows     local users to obtain sensitive information from kernel     memory and bypass the KASLR protection mechanism (in     the kernel through 4.9) via a crafted ACPI     table.(CVE-2017-13694)

  - The acpi_ns_evaluate() function in     drivers/acpi/acpica/nseval.c in the Linux kernel     through 4.12.9 does not flush the operand cache and     causes a kernel stack dump, which allows local users to     obtain sensitive information from kernel memory and     bypass the KASLR protection mechanism (in the kernel     through 4.9) via a crafted ACPI table.(CVE-2017-13695)

  - The XFS_IS_REALTIME_INODE macro in fs/xfs/xfs_linux.h     in the Linux kernel before 4.13.2 does not verify that     a filesystem has a realtime device, which allows local     users to cause a denial of service (NULL pointer     dereference and OOPS) via vectors related to setting an     RHINHERIT flag on a directory.(CVE-2017-14340)

  - The xfs_bmap_extents_to_btree function in     fs/xfs/libxfs/xfs_bmap.c in the Linux kernel through     4.16.3 allows local users to cause a denial of service     (xfs_bmapi_write NULL pointer dereference) via a     crafted xfs image.(CVE-2018-10323)

  - A flaw was found in Linux kernel in the ext4 filesystem     code. A use-after-free is possible in     ext4_ext_remove_space() function when mounting and     operating a crafted ext4 image.(CVE-2018-10876)

  - A flaw was found in the Linux kernel ext4 filesystem.
    An out-of-bound access is possible in the     ext4_ext_drop_refs() function when operating on a     crafted ext4 filesystem image.(CVE-2018-10877)

  - The pcpu_embed_first_chunk function in mm/percpu.c in     the Linux kernel through 4.14.14 allows local users to     obtain sensitive address information by reading dmesg     data from a(CVE-2018-5995)

  - Memory leak in the irda_bind function in     net/irda/af_irda.c and later in     drivers/staging/irda/net/af_irda.c in the Linux kernel     before 4.17 allows local users to cause a denial of     service (memory consumption) by repeatedly binding an     AF_IRDA socket.(CVE-2018-6554)

  - A NULL pointer dereference was found in the     net/rds/rdma.c __rds_rdma_map() function in the Linux     kernel before 4.14.7 allowing local attackers to cause     a system panic and a denial-of-service, related to     RDS_GET_MR and RDS_GET_MR_FOR_DEST.(CVE-2018-7492)

  - ** DISPUTED ** Race condition in the     store_int_with_restart() function in     arch/x86/kernel/cpu/mcheck/mce.c in the Linux kernel     through 4.15.7 allows local users to cause a denial of     service (panic) by leveraging root access to write to     the check_interval file in a     /sys/devices/system/machinecheck/machinecheck<cpu     number> directory. NOTE: a third party has indicated     that this report is not security     relevant.(CVE-2018-7995)

  - Non-optimized code for key handling of shared futexes     was found in the Linux kernel in the form of unbounded     contention time due to the page lock for real-time     users. Before the fix, the page lock was an     unnecessarily heavy lock for the futex path that     protected too much. After the fix, the page lock is     only required in a specific corner case.(CVE-2018-9422)

  - A memory leak in the ccp_run_sha_cmd() function in     drivers/crypto/ccp/ccp-ops.c in the Linux kernel     through 5.3.9 allows attackers to cause a denial of     service (memory consumption), aka     CID-128c66429247.(CVE-2019-18808)

  - In the Linux kernel before 5.1, there is a memory leak     in __feat_register_sp() in net/dccp/feat.c, which may     cause denial of service, aka     CID-1d3ff0950e2b.(CVE-2019-20096)

  - An issue was discovered in the Linux kernel before     5.4.7. The prb_calc_retire_blk_tmo() function in     net/packet/af_packet.c can result in a denial of     service (CPU consumption and soft lockup) in a certain     failure case involving TPACKET_V3, aka     CID-b43d1f9f7067.(CVE-2019-20812)

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.

ID	Name	Product	Family	Published	Updated	Severity
94409	CentOS 5 : kernel (CESA-2016:2124) (Dirty COW)	Nessus	CentOS Local Security Checks	10/31/2016	6/3/2021	high
94432	Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (20161028) (Dirty COW)	Nessus	Scientific Linux Local Security Checks	10/31/2016	6/3/2021	high
91563	Ubuntu 14.04 LTS : linux-lts-vivid vulnerabilities (USN-3001-1)	Nessus	Ubuntu Local Security Checks	6/10/2016	9/18/2019	critical
91565	Ubuntu 15.10 : linux vulnerabilities (USN-3003-1)	Nessus	Ubuntu Local Security Checks	6/10/2016	9/18/2019	critical
91566	Ubuntu 15.10 : linux-raspi2 vulnerabilities (USN-3004-1)	Nessus	Ubuntu Local Security Checks	6/10/2016	9/18/2019	critical
91560	Ubuntu 12.04 LTS : linux-lts-trusty vulnerabilities (USN-2998-1)	Nessus	Ubuntu Local Security Checks	6/10/2016	9/18/2019	critical
141697	EulerOS Virtualization 3.0.2.2 : kernel (EulerOS-SA-2020-2222)	Nessus	Huawei Local Security Checks	10/21/2020	1/6/2021	high

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