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Red Hat Product Errata RHSA-2015:1643 - Security Advisory
Issued:
2015-08-18
Updated:
2015-08-18

RHSA-2015:1643 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Moderate: kernel security and bug fix update

Type/Severity

Security Advisory: Moderate

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

Updated kernel packages that fix one security issue and two bugs are now
available for Red Hat Enterprise Linux 6.4 Advanced Update Support.

Red Hat Product Security has rated this update as having Moderate security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

Description

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

  • 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)

This update also fixes the following bugs:

  • Due to bad memory or memory corruption, an isolated BUG_ON(mm->nr_ptes)

was sometimes reported, indicating that not all the page tables allocated
could be found and freed when the exit_mmap() function cleared the user
address space. As a consequence, a kernel panic occurred. To fix this bug,
the BUG_ON() function has been replaced by WARN_ON(), which prevents the
kernel from panicking in the aforementioned situation. (BZ#1235929)

  • Previously, it was for the ext4 driver to read a metadata block and use

it without a verification. If the metadata block was corrupted, a kernel
panic could occur. With this update, verification is forced on every buffer
before it is used, which uncovers possible corruption and prevents further
use of the corrupted metadata buffer. (BZ#1242930)

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. 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

  • Red Hat Enterprise Linux Server - AUS 6.4 x86_64

Fixes

  • BZ - 1218074 - CVE-2015-3636 kernel: ping sockets: use-after-free leading to local privilege escalation

CVEs

  • CVE-2015-3636

References

  • https://access.redhat.com/security/updates/classification/#moderate
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux Server - AUS 6.4

SRPM
kernel-2.6.32-358.65.1.el6.src.rpm SHA-256: 7c0ae5db5976caaa1b489a817ce50c19c73bd10eb0fa18cde73f35c8e23ea196
x86_64
kernel-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: ea0fe3bece3e1f7d2fa0a32d645cd91d479f9f3bc2f45d8ad0f313b5e5dc63a3
kernel-debug-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: a2c6b80962787a0d7a0707647d7b1a2b1bf97431525aa1b7d5ddee6a7d815a05
kernel-debug-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: e7f7a36276e52229398a074834836983eb440f404d2a5589c39e46391b0a7e95
kernel-debug-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: e7f7a36276e52229398a074834836983eb440f404d2a5589c39e46391b0a7e95
kernel-debug-devel-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: fd25d13e91d844666899d226b613261d045c821f3b4088bc30d35d1bc625a8ad
kernel-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 52c8c903401528472c77560f2eea52b060f9827d5029674e32edda186254d6e4
kernel-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 52c8c903401528472c77560f2eea52b060f9827d5029674e32edda186254d6e4
kernel-debuginfo-common-x86_64-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 791b8d51b87ef7aa75f66c8817b4f01797cafd3ff4bce1c701fdb4a03a41507d
kernel-debuginfo-common-x86_64-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 791b8d51b87ef7aa75f66c8817b4f01797cafd3ff4bce1c701fdb4a03a41507d
kernel-devel-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 99318f0f776e1c3eb5e0c6a022e1b821a782f4226cf8411020a4da9eb112e07d
kernel-doc-2.6.32-358.65.1.el6.noarch.rpm SHA-256: e4d4c015d47f403ed343d54bed75f96c1087ebdcf1082cdfb32dc09c13a9e910
kernel-firmware-2.6.32-358.65.1.el6.noarch.rpm SHA-256: 5321ff25ce39042806a8db529dc3f443705189327397fad8e6cc1b2572e627f5
kernel-headers-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 60b9d36fbae81196c457dd66e9f03a26135878d4c28118d78aef2b7d0f389150
perf-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: d631cd540125788d654e24e278c948cb61affc35ffd89cdd5329a60e4e3eb8ae
perf-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: e1b36f7eb390351cf35ed27437856a54ac5dafecc5b7f090b7b547361b0b0b60
perf-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: e1b36f7eb390351cf35ed27437856a54ac5dafecc5b7f090b7b547361b0b0b60
python-perf-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: 0a3fb0fc07e85f901c0c42c7308ce8035ba4b163ae692da8c8c0a310df36d967
python-perf-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: cb71a9007a732f86e23d9f7fb68b95cd99b86d8989b0307b34476e11b330b76a
python-perf-debuginfo-2.6.32-358.65.1.el6.x86_64.rpm SHA-256: cb71a9007a732f86e23d9f7fb68b95cd99b86d8989b0307b34476e11b330b76a

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

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