Synopsis

Important: kernel security update

Type/Severity

Security Advisory: Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.4 Advanced Update Support.

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.

Description

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)
  
• A flaw was found in the Linux kernel's keyring handling code: the key_reject_and_link() function could be forced to free an arbitrary memory block. An attacker could use this flaw to trigger a use-after-free condition on the system, potentially allowing for privilege escalation. (CVE-2016-4470, Important)
  

Red Hat would like to thank Phil Oester for reporting CVE-2016-5195. The CVE-2016-4470 issue was discovered by David Howells (Red Hat).

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux Server - AUS 6.4 x86_64

Fixes

• BZ - 1341716 - CVE-2016-4470 kernel: Uninitialized variable in request_key handling causes kernel crash in error handling path
• BZ - 1384344 - CVE-2016-5195 kernel: mm: privilege escalation via MAP_PRIVATE COW breakage

CVEs

• CVE-2016-4470
• CVE-2016-5195

References

• https://access.redhat.com/security/updates/classification/#important

Red Hat Enterprise Linux Server - AUS 6.4

SRPM
kernel-2.6.32-358.75.1.el6.src.rpm	SHA-256: 740df836dad8278a46aac340648d32099c182d383a3f0d48ef466e469bee968b
x86_64
kernel-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 8e6181c577bd727f456a7d6ea77ac9853a204397cf6b07bf1388ec124113b851
kernel-debug-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 34d8b6eb8b009d36e3bf76b8bc9288d7f38f28f8b7c1a46ef2861e3efe260e14
kernel-debug-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 0f82325cb38a66ed6a8588a7b93cb730caa5a9278073b5ea305b5d8875fbd6cf
kernel-debug-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 0f82325cb38a66ed6a8588a7b93cb730caa5a9278073b5ea305b5d8875fbd6cf
kernel-debug-devel-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 822419f37dd3d0270d45fd0a29bf65a60e04673c6c786830ce6222f021ef5824
kernel-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: c5046f3269761a93d049511b4d6de3132d1d2e53f9062727611431bd41749cda
kernel-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: c5046f3269761a93d049511b4d6de3132d1d2e53f9062727611431bd41749cda
kernel-debuginfo-common-x86_64-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 08d53cba010e399c4ab49c07053cee27dd50b221e93532e87d8168a5c502c3e5
kernel-debuginfo-common-x86_64-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 08d53cba010e399c4ab49c07053cee27dd50b221e93532e87d8168a5c502c3e5
kernel-devel-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: bc7be5fb5e4552b740c6c69146aab9ad023ca3f34732ae99410b5598a4c7a130
kernel-doc-2.6.32-358.75.1.el6.noarch.rpm	SHA-256: 796d78ffe2eaf51a507b9abefc055036f3063a4e3d94553ed5fb8909635f1aac
kernel-firmware-2.6.32-358.75.1.el6.noarch.rpm	SHA-256: 1b14916b79525c6ad4d83618edbdf05af99c0d300d0b8f037c9467c42ed17697
kernel-headers-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: f51979830311736ae941aafb0aede4503616e214b8889137fef501d46a109227
perf-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 62aab0474d32e3329411f764e7b694d130292a7ed8b3e199a71be3b6ce56a7b1
perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 5788ef3808837a1831fbe58e8b7e34e4414153c2e0ab847e1743b984fc5d0707
perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 5788ef3808837a1831fbe58e8b7e34e4414153c2e0ab847e1743b984fc5d0707
python-perf-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: acc869b8a2d0fc1e0abac9189d1da78b1d96aa785b819408b92dee515186c494
python-perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 8b8b03cfd8cbabfb78c9e8176ff531756ecc3fa7d47ae91a83e41295fe05b18b
python-perf-debuginfo-2.6.32-358.75.1.el6.x86_64.rpm	SHA-256: 8b8b03cfd8cbabfb78c9e8176ff531756ecc3fa7d47ae91a83e41295fe05b18b