Issued:
2016-08-19
Updated:
2016-08-19

RHSA-2016:1640 - 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 6.6 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):

  • A flaw was found in the way certain interfaces of the Linux kernel's Infiniband subsystem used write() as bi-directional ioctl() replacement, which could lead to insufficient memory security checks when being invoked using the splice() system call. A local unprivileged user on a system with either Infiniband hardware present or RDMA Userspace Connection Manager Access module explicitly loaded, could use this flaw to escalate their privileges on the system. (CVE-2016-4565, Important)

Red Hat would like to thank Jann Horn for reporting this issue.

Bug Fix(es):

  • After upgrading the kernel, the CPU load average was higher compared to the prior kernel version due to the modification of the scheduler. The provided patchset rolls back the calculation algorithm of the load average to the status of the previous system version, thus resulting in lower values in the same system load. (BZ#1343013)

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 Support6.6x86_64
Red Hat Enterprise Linux for x86_64 - Extended Update Support6.6i386
Red Hat Enterprise Linux for Power, big endian - Extended Update Support6.6ppc64
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support6.6s390x
Red Hat Enterprise Linux Server - TUS6.6x86_64
Red Hat Enterprise Linux Server - AUS6.6x86_64
Red Hat Enterprise Linux EUS Compute Node6.6x86_64

Updated Packages

  • kernel-debug-devel-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-firmware-2.6.32-504.51.1.el6.noarch.rpm
  • kernel-debug-devel-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-bootwrapper-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-debuginfo-common-s390x-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-debug-2.6.32-504.51.1.el6.ppc64.rpm
  • perf-2.6.32-504.51.1.el6.i686.rpm
  • perf-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-headers-2.6.32-504.51.1.el6.x86_64.rpm
  • perf-2.6.32-504.51.1.el6.x86_64.rpm
  • python-perf-2.6.32-504.51.1.el6.i686.rpm
  • kernel-headers-2.6.32-504.51.1.el6.i686.rpm
  • kernel-debug-debuginfo-2.6.32-504.51.1.el6.i686.rpm
  • kernel-headers-2.6.32-504.51.1.el6.ppc64.rpm
  • perf-debuginfo-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-abi-whitelists-2.6.32-504.51.1.el6.noarch.rpm
  • kernel-debug-debuginfo-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-debuginfo-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-debuginfo-common-x86_64-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-debug-2.6.32-504.51.1.el6.i686.rpm
  • kernel-devel-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-kdump-debuginfo-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-debuginfo-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-kdump-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-debug-devel-2.6.32-504.51.1.el6.i686.rpm
  • kernel-devel-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-2.6.32-504.51.1.el6.i686.rpm
  • perf-2.6.32-504.51.1.el6.s390x.rpm
  • python-perf-2.6.32-504.51.1.el6.s390x.rpm
  • python-perf-debuginfo-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-2.6.32-504.51.1.el6.src.rpm
  • kernel-debug-debuginfo-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-debug-debuginfo-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-debuginfo-2.6.32-504.51.1.el6.i686.rpm
  • perf-debuginfo-2.6.32-504.51.1.el6.i686.rpm
  • kernel-debug-2.6.32-504.51.1.el6.x86_64.rpm
  • perf-debuginfo-2.6.32-504.51.1.el6.ppc64.rpm
  • python-perf-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-kdump-devel-2.6.32-504.51.1.el6.s390x.rpm
  • python-perf-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-debuginfo-2.6.32-504.51.1.el6.ppc64.rpm
  • python-perf-debuginfo-2.6.32-504.51.1.el6.i686.rpm
  • python-perf-debuginfo-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-devel-2.6.32-504.51.1.el6.x86_64.rpm
  • kernel-debug-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-headers-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-devel-2.6.32-504.51.1.el6.i686.rpm
  • kernel-debuginfo-common-ppc64-2.6.32-504.51.1.el6.ppc64.rpm
  • kernel-debuginfo-common-i686-2.6.32-504.51.1.el6.i686.rpm
  • perf-debuginfo-2.6.32-504.51.1.el6.x86_64.rpm
  • python-perf-debuginfo-2.6.32-504.51.1.el6.s390x.rpm
  • kernel-doc-2.6.32-504.51.1.el6.noarch.rpm
  • kernel-debug-devel-2.6.32-504.51.1.el6.s390x.rpm

Fixes

CVEs

References

Additional information