RHEL 6 : kernel (RHSA-2015:1211)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

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.

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2015-1805.html
http://rhn.redhat.com/errata/RHSA-2015-1211.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.0
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 84610 ()

Bugtraq ID: 74951

CVE ID: CVE-2015-1805

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