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Red Hat Security Advisory 2015-1211-01

Red Hat Security Advisory 2015-1211-01
Posted Jul 7, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1211-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. It was found that the Linux kernel's implementation of vectored pipe read and write functionality did not take into account the I/O vectors that were already processed when retrying after a failed atomic access operation, potentially resulting in memory corruption due to an I/O vector array overrun. A local, unprivileged user could use this flaw to crash the system or, potentially, escalate their privileges on the system.

tags | advisory, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2015-1805
MD5 | fb77d21c99540f347daaff0194267691

Red Hat Security Advisory 2015-1211-01

Change Mirror Download
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Hash: SHA1

=====================================================================
Red Hat Security Advisory

Synopsis: Important: kernel security and bug fix update
Advisory ID: RHSA-2015:1211-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1211.html
Issue date: 2015-07-07
CVE Names: CVE-2015-1805
=====================================================================

1. Summary:

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 Important 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.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Server AUS (v. 6.4) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - i386, ppc64, s390x, x86_64

3. Description:

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

* It was found that the Linux kernel's implementation of vectored pipe read
and write functionality did not take into account the I/O vectors that were
already processed when retrying after a failed atomic access operation,
potentially resulting in memory corruption due to an I/O vector array
overrun. A local, unprivileged user could use this flaw to crash the system
or, potentially, escalate their privileges on the system. (CVE-2015-1805,
Important)

The security impact of this issue was discovered by Red Hat.

This update also fixes the following bugs:

* The backlog data could previously not be consumed when the
audit_log_start() function was running even if audit_log_start() called the
wait_for_auditd() function to consume it. As only auditd could consume the
backlog data, audit_log_start() terminated unexpectedly. Consequently, the
system became unresponsive until the backlog timeout was up. With this
update, audit_log_start() no longer terminates and the system shuts down
and reboots gracefully in a timely manner. (BZ#1140489)

* Direct I/O writes extending a parallel file could previously race to
update the size of the file. If the writes executed in the out-of-order
manner, the file size could move backwards and push a previously completed
write beyond EOF, causing it to be lost. With this update, file size
updates are always executed in appropriate order, thus fixing this bug.
(BZ#1218497)

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.

4. 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1202855 - CVE-2015-1805 kernel: pipe: iovec overrun leading to memory corruption

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 6.4):

Source:
kernel-2.6.32-358.62.1.el6.src.rpm

i386:
kernel-2.6.32-358.62.1.el6.i686.rpm
kernel-debug-2.6.32-358.62.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-358.62.1.el6.i686.rpm
kernel-debug-devel-2.6.32-358.62.1.el6.i686.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-358.62.1.el6.i686.rpm
kernel-devel-2.6.32-358.62.1.el6.i686.rpm
kernel-headers-2.6.32-358.62.1.el6.i686.rpm
perf-2.6.32-358.62.1.el6.i686.rpm
perf-debuginfo-2.6.32-358.62.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.i686.rpm

noarch:
kernel-doc-2.6.32-358.62.1.el6.noarch.rpm
kernel-firmware-2.6.32-358.62.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-358.62.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debug-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-358.62.1.el6.ppc64.rpm
kernel-devel-2.6.32-358.62.1.el6.ppc64.rpm
kernel-headers-2.6.32-358.62.1.el6.ppc64.rpm
perf-2.6.32-358.62.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-358.62.1.el6.s390x.rpm
kernel-debug-2.6.32-358.62.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-358.62.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-358.62.1.el6.s390x.rpm
kernel-devel-2.6.32-358.62.1.el6.s390x.rpm
kernel-headers-2.6.32-358.62.1.el6.s390x.rpm
kernel-kdump-2.6.32-358.62.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-358.62.1.el6.s390x.rpm
perf-2.6.32-358.62.1.el6.s390x.rpm
perf-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debug-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.62.1.el6.x86_64.rpm
kernel-devel-2.6.32-358.62.1.el6.x86_64.rpm
kernel-headers-2.6.32-358.62.1.el6.x86_64.rpm
perf-2.6.32-358.62.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 6.4):

Source:
kernel-2.6.32-358.62.1.el6.src.rpm

i386:
kernel-debug-debuginfo-2.6.32-358.62.1.el6.i686.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-358.62.1.el6.i686.rpm
perf-debuginfo-2.6.32-358.62.1.el6.i686.rpm
python-perf-2.6.32-358.62.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-358.62.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm
python-perf-2.6.32-358.62.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-358.62.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
perf-debuginfo-2.6.32-358.62.1.el6.s390x.rpm
python-perf-2.6.32-358.62.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-358.62.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm
python-perf-2.6.32-358.62.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-358.62.1.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2015-1805
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2015 Red Hat, Inc.
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