Issued:
2015-07-14
Updated:
2015-07-14

RHSA-2015:1221 - Moderate: kernel security, bug fix, and enhancement update

Synopsis

Moderate: kernel security, bug fix, and enhancement update

Type/Severity

Security Advisory Moderate

Topic

Updated kernel packages that fix multiple security issues, several bugs, and add one enhancement are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

Description

The kernel packages contain the Linux kernel, the core of any Linux operating system.

  • A NULL pointer dereference flaw was found in the way the Linux kernel's virtual console implementation handled reference counting when accessing pseudo-terminal device files (/dev/pts/*). A local, unprivileged attacker could use this flaw to crash the system. (CVE-2011-5321, Moderate)

  • It was found that the Linux kernel's ping socket implementation did not properly handle socket unhashing during spurious disconnects, which could lead to a use-after-free flaw. On x86-64 architecture systems, a local user able to create ping sockets could use this flaw to crash the system. On non-x86-64 architecture systems, a local user able to create ping sockets could use this flaw to escalate their privileges on the system. (CVE-2015-3636, Moderate)

  • An integer overflow flaw was found in the way the Linux kernel randomized the stack for processes on certain 64-bit architecture systems, such as x86-64, causing the stack entropy to be reduced by four. (CVE-2015-1593, Low)

  • A flaw was found in the way the Linux kernel's 32-bit emulation implementation handled forking or closing of a task with an 'int80' entry. A local user could potentially use this flaw to escalate their privileges on the system. (CVE-2015-2830, Low)

  • It was found that the Linux kernel's TCP/IP protocol suite implementation for IPv6 allowed the Hop Limit value to be set to a smaller value than the default one. An attacker on a local network could use this flaw to prevent systems on that network from sending or receiving network packets. (CVE-2015-2922, Low)

These updated kernel packages also include numerous bug fixes and one enhancement. Space precludes documenting all of these changes in this advisory. For information on the most significant of these changes, users are directed to the following article on the Red Hat Customer Portal:

https://access.redhat.com/articles/1506133

All kernel users are advised to upgrade to these updated packages, which contain backported patches to correct these issues and add this enhancement. The system must be rebooted for this update to take effect.

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

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

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 Scientific Computing6x86_64
Red Hat Enterprise Linux for Power, big endian6ppc64
Red Hat Enterprise Linux for Power, big endian - Extended Update Support6.6ppc64
Red Hat Enterprise Linux for IBM z Systems6s390x
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support6.6s390x
Red Hat Enterprise Linux Workstation6x86_64
Red Hat Enterprise Linux Workstation6i386
Red Hat Enterprise Linux Server6x86_64
Red Hat Enterprise Linux Server6i386
Red Hat Enterprise Linux Server from RHUI6x86_64
Red Hat Enterprise Linux Server from RHUI6i386
Red Hat Enterprise Linux Server - TUS6.6x86_64
Red Hat Enterprise Linux Server - Retired Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Update Support from RHUI6.6x86_64
Red Hat Enterprise Linux Server - Extended Update Support from RHUI6.6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6x86_64
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension6i386
Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension (for IBM z Systems)6s390x
Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems)6s390x
Red Hat Enterprise Linux Server - AUS6.6x86_64
Red Hat Enterprise Linux EUS Compute Node6.6x86_64
Red Hat Enterprise Linux Desktop6x86_64
Red Hat Enterprise Linux Desktop6i386

Updated Packages

  • kernel-debuginfo-common-s390x-2.6.32-504.30.3.el6.s390x.rpm
  • perf-2.6.32-504.30.3.el6.ppc64.rpm
  • kernel-devel-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-debug-2.6.32-504.30.3.el6.ppc64.rpm
  • kernel-headers-2.6.32-504.30.3.el6.i686.rpm
  • kernel-debuginfo-common-ppc64-2.6.32-504.30.3.el6.ppc64.rpm
  • kernel-debuginfo-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-debug-debuginfo-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-kdump-2.6.32-504.30.3.el6.s390x.rpm
  • python-perf-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debuginfo-common-x86_64-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debug-debuginfo-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debuginfo-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debuginfo-2.6.32-504.30.3.el6.i686.rpm
  • kernel-firmware-2.6.32-504.30.3.el6.noarch.rpm
  • kernel-devel-2.6.32-504.30.3.el6.i686.rpm
  • perf-debuginfo-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debug-debuginfo-2.6.32-504.30.3.el6.ppc64.rpm
  • kernel-bootwrapper-2.6.32-504.30.3.el6.ppc64.rpm
  • kernel-doc-2.6.32-504.30.3.el6.noarch.rpm
  • kernel-debug-devel-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debug-devel-2.6.32-504.30.3.el6.ppc64.rpm
  • python-perf-debuginfo-2.6.32-504.30.3.el6.i686.rpm
  • kernel-headers-2.6.32-504.30.3.el6.ppc64.rpm
  • perf-debuginfo-2.6.32-504.30.3.el6.i686.rpm
  • kernel-debug-2.6.32-504.30.3.el6.i686.rpm
  • kernel-abi-whitelists-2.6.32-504.30.3.el6.noarch.rpm
  • python-perf-debuginfo-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-2.6.32-504.30.3.el6.i686.rpm
  • kernel-debug-devel-2.6.32-504.30.3.el6.i686.rpm
  • kernel-debug-2.6.32-504.30.3.el6.x86_64.rpm
  • python-perf-2.6.32-504.30.3.el6.i686.rpm
  • kernel-debug-debuginfo-2.6.32-504.30.3.el6.i686.rpm
  • perf-2.6.32-504.30.3.el6.i686.rpm
  • kernel-devel-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-debuginfo-common-i686-2.6.32-504.30.3.el6.i686.rpm
  • kernel-debuginfo-2.6.32-504.30.3.el6.ppc64.rpm
  • python-perf-debuginfo-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-kdump-debuginfo-2.6.32-504.30.3.el6.s390x.rpm
  • python-perf-2.6.32-504.30.3.el6.ppc64.rpm
  • python-perf-debuginfo-2.6.32-504.30.3.el6.ppc64.rpm
  • perf-debuginfo-2.6.32-504.30.3.el6.s390x.rpm
  • python-perf-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-debug-devel-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-headers-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-2.6.32-504.30.3.el6.x86_64.rpm
  • perf-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-headers-2.6.32-504.30.3.el6.x86_64.rpm
  • perf-2.6.32-504.30.3.el6.x86_64.rpm
  • kernel-devel-2.6.32-504.30.3.el6.ppc64.rpm
  • kernel-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-kdump-devel-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-debug-2.6.32-504.30.3.el6.s390x.rpm
  • kernel-2.6.32-504.30.3.el6.src.rpm
  • kernel-2.6.32-504.30.3.el6.ppc64.rpm
  • perf-debuginfo-2.6.32-504.30.3.el6.ppc64.rpm

Fixes

CVEs

References

Additional information