Issued:
2017-09-19
Updated:
2017-09-19

RHSA-2017:2760 - Important: kernel security and bug fix update

Synopsis

Important: kernel security and bug fix update

Type/Severity

Security Advisory Important

Topic

An update for kernel is now available for Red Hat Enterprise Linux 6.7 Extended 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):

  • 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):

  • Previously, while the MAP_GROWSDOWN flag was set, writing to the memory which was mapped with the mmap system call failed with the SIGBUS signal. This update fixes memory management in the Linux kernel by backporting an upstream patch that enlarges the stack guard page gap. As a result, mmap now works as expected under the described circumstances. (BZ#1474721)

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
Red Hat Enterprise Linux for x86_64 - Extended Update Support6.7x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support6.7i386
Red Hat Enterprise Linux for SAP Solutions for x86_64 - Extended Update Support6.7x86_64
Red Hat Enterprise Linux for Power, big endian - Extended Update Support6.7ppc64
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support6.7s390x
Red Hat Enterprise Linux EUS Compute Node6.7x86_64

Updated Packages

  • kernel-2.6.32-573.47.1.el6.s390x.rpm
  • perf-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-headers-2.6.32-573.47.1.el6.ppc64.rpm
  • perf-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-debuginfo-common-i686-2.6.32-573.47.1.el6.i686.rpm
  • kernel-bootwrapper-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-devel-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-devel-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-kdump-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
  • perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-2.6.32-573.47.1.el6.x86_64.rpm
  • python-perf-2.6.32-573.47.1.el6.ppc64.rpm
  • perf-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
  • perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
  • kernel-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-2.6.32-573.47.1.el6.src.rpm
  • kernel-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-debuginfo-common-ppc64-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-debuginfo-common-x86_64-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-debug-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-firmware-2.6.32-573.47.1.el6.noarch.rpm
  • kernel-headers-2.6.32-573.47.1.el6.x86_64.rpm
  • perf-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-2.6.32-573.47.1.el6.i686.rpm
  • kernel-debug-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-debug-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-debug-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-debug-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-headers-2.6.32-573.47.1.el6.i686.rpm
  • kernel-debuginfo-2.6.32-573.47.1.el6.i686.rpm
  • kernel-headers-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-debug-devel-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-debug-2.6.32-573.47.1.el6.i686.rpm
  • kernel-debug-devel-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-kdump-devel-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-debug-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
  • python-perf-2.6.32-573.47.1.el6.i686.rpm
  • python-perf-2.6.32-573.47.1.el6.s390x.rpm
  • python-perf-debuginfo-2.6.32-573.47.1.el6.i686.rpm
  • python-perf-debuginfo-2.6.32-573.47.1.el6.x86_64.rpm
  • python-perf-debuginfo-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-devel-2.6.32-573.47.1.el6.i686.rpm
  • perf-2.6.32-573.47.1.el6.i686.rpm
  • perf-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-debug-devel-2.6.32-573.47.1.el6.i686.rpm
  • kernel-debug-debuginfo-2.6.32-573.47.1.el6.i686.rpm
  • kernel-doc-2.6.32-573.47.1.el6.noarch.rpm
  • kernel-abi-whitelists-2.6.32-573.47.1.el6.noarch.rpm
  • kernel-debug-devel-2.6.32-573.47.1.el6.ppc64.rpm
  • python-perf-2.6.32-573.47.1.el6.x86_64.rpm
  • kernel-devel-2.6.32-573.47.1.el6.x86_64.rpm
  • python-perf-debuginfo-2.6.32-573.47.1.el6.ppc64.rpm
  • kernel-kdump-2.6.32-573.47.1.el6.s390x.rpm
  • kernel-debuginfo-common-s390x-2.6.32-573.47.1.el6.s390x.rpm

Fixes

CVEs

References

Additional information