Issued:
2016-10-26
Updated:
2016-10-26

RHSA-2016:2107 - Important: kernel-rt security update

Synopsis

Important: kernel-rt security update

Type/Severity

Security Advisory Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise MRG 2.5.

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.

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 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)

  • Linux kernel built with the 802.1Q/802.1ad VLAN(CONFIG_VLAN_8021Q) OR Virtual eXtensible Local Area Network(CONFIG_VXLAN) with Transparent Ethernet Bridging(TEB) GRO support, is vulnerable to a stack overflow issue. It could occur while receiving large packets via GRO path; As an unlimited recursion could unfold in both VLAN and TEB modules, leading to a stack corruption in the kernel. (CVE-2016-7039, Important)

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

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

ProductVersionArch
MRG Realtime2x86_64

Updated Packages

  • kernel-rt-3.10.0-327.rt56.198.el6rt.src.rpm
  • kernel-rt-trace-devel-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-doc-3.10.0-327.rt56.198.el6rt.noarch.rpm
  • kernel-rt-trace-debuginfo-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-debuginfo-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-vanilla-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-debug-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-vanilla-debuginfo-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-debug-debuginfo-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-vanilla-devel-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-devel-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-3.10.0-327.rt56.198.el6rt.x86_64.rpm
  • kernel-rt-firmware-3.10.0-327.rt56.198.el6rt.noarch.rpm
  • kernel-rt-trace-3.10.0-327.rt56.198.el6rt.x86_64.rpm

Fixes

CVEs

References

Additional information