Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.

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

Security Fix(es):

• A 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)
  
• The lrw_crypt() function in 'crypto/lrw.c' in the Linux kernel before 4.5 allows local users to cause a system crash and a denial of service by the NULL pointer dereference via accept(2) system call for AF_ALG socket without calling setkey() first to set a cipher key. (CVE-2015-8970, Moderate)
  

Red Hat would like to thank Igor Redko (Virtuozzo) and Andrey Ryabinin (Virtuozzo) for reporting CVE-2017-2647 and Igor Redko (Virtuozzo) and Vasily Averin (Virtuozzo) for reporting CVE-2015-8970.

Bug Fix(es):

• Writing model-specific register (MSR) registers during intel_idle initialization could previously cause exceptions. Consequently, a kernel panic occurred during this initialization. The function call to write to the MSR with
  exception handling was modified to use wrmsrl_safe() instead of wrmsrl(). In this scenario, the kernel no longer panics. (BZ#1447438)
  
• The ixgbe driver was using incorrect bitwise operations on received PTP flags. Consequently, systems that were using the ixgbe driver could not synchronize time using PTP. The provided patch corrected the bitwise operations on received PTP flags allowing these system to correctly synchronize time using PTP. (BZ#1469795) (BZ#1451821)
  

The kernel-rt packages have been upgraded to version 3.10.0-514.rt56.230,
which provides a number of security and bug fixes over the previous
version. (BZ#1463427)

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

• MRG Realtime 2 x86_64

Fixes

• BZ - 1386286 - CVE-2015-8970 kernel: crypto: GPF in lrw_crypt caused by null-deref
• BZ - 1428353 - CVE-2017-2647 kernel: Null pointer dereference in search_keyring
• BZ - 1430347 - CVE-2016-10200 kernel: l2tp: Race condition in the L2TPv3 IP encapsulation feature
• BZ - 1437675 - ftrace: pull upstream commits for correct selftest operation
• BZ - 1463427 - update the MRG 2.5.z 3.10 kernel-rt sources

CVEs

• CVE-2015-8970
• CVE-2016-10200
• CVE-2017-2647

References

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

MRG Realtime 2

SRPM
kernel-rt-3.10.0-514.rt56.231.el6rt.src.rpm	SHA-256: 501cde5cfd6f0c20a409ad666a60c571f40284dae1cbf8935eafbaddf87f02ee
x86_64
kernel-rt-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 26399fc781542416cb4453a324ce0e620a8a081dd3f57ecf5ae54c313932e915
kernel-rt-debug-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: a39261c9c0f1567cb496c9187ef9e4fba1533fbee9923ac542ff8910f6a0117e
kernel-rt-debug-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: b5fd90f0ff851039ba92e56090576e928fdff3ae2ac8ee1cc92d80bd4659de13
kernel-rt-debug-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: b44bcc2f7ac57a31682413051ffef6fa6e310ecbe7e5ffdf938eb462502194f9
kernel-rt-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 37f603a59e5bd6920c1742aaa05d8e329a87762ca277d7fcd2c3a8975fd95b16
kernel-rt-debuginfo-common-x86_64-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 749e04a3fa152c6661eb3cf7f22716469688f0590adba46729ff4c42f030d8e6
kernel-rt-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 08f7a10911447bce9cd7db3c9054ff7627f5b813e83a86719bde46e728da7f68
kernel-rt-doc-3.10.0-514.rt56.231.el6rt.noarch.rpm	SHA-256: 3a32238980da9b1d296ee768bb89086961ac46aafbc33dafc070731903486cde
kernel-rt-firmware-3.10.0-514.rt56.231.el6rt.noarch.rpm	SHA-256: 42c976dd6a51631fb3b44030e08b11cba4b9675a6677f353ccca460045d43b9a
kernel-rt-trace-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: d967cab83a3a08ac8d73a9ad49f5a9685b128834f38ca2b461969084449106e4
kernel-rt-trace-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 8322e6697dee56cb94304e107da4d2826f777dfafe0ee6a1b46b033b9e579d3d
kernel-rt-trace-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: cbcba264e7414abb14af04a1b1b34bc0914de8ac799d979c6e9e54d3313b45a8
kernel-rt-vanilla-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 7e0fc6c9524ae5171956c1c83d7ccec416d64726071256a01d5030dab0a761d3
kernel-rt-vanilla-debuginfo-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: b1db5a0812a2fad896019cdfd9735dd6bfcf0bbbb0e6034a9a32fe1354509a6e
kernel-rt-vanilla-devel-3.10.0-514.rt56.231.el6rt.x86_64.rpm	SHA-256: 0d629397e7e7415fd3a40831ee8a0bce9788420d77d8b3e9edc15cf311020695