RHEL 6 : kernel (RHSA-2017:0892)

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


Synopsis :

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

Description :

An update for kernel is now available for Red Hat Enterprise Linux 6.

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.

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

Security Fix(es) :

* A race condition flaw was found in the N_HLDC Linux kernel driver
when accessing n_hdlc.tbuf list that can lead to double free. A local,
unprivileged user able to set the HDLC line discipline on the tty
device could use this flaw to increase their privileges on the system.
(CVE-2017-2636, Important)

* A flaw was found in the Linux kernel's implementation of seq_file
where a local attacker could manipulate memory in the put() function
pointer. This could lead to memory corruption and possible privileged
escalation. (CVE-2016-7910, Moderate)

Red Hat would like to thank Alexander Popov for reporting
CVE-2017-2636.

Bug Fix(es) :

* Previously, Chelsio firmware included an incorrectly-formatted
firmware bin file. As a consequence, the firmware could not be
flashed. This update provides a firmware bin file that is formatted
correctly. As a result, Chelsio firmware can now be flashed
successfully. (BZ#1433865)

* When multiple simultaneous processes attempted to read from the
/proc/stat file, spinlock overhead was generated on Non-Uniform Memory
Access (NUMA) systems. Consequently, a large amount of CPU was
consumed. With this update, the underlying source code has been fixed
to avoid taking spinlock when the interrupt line does not exist. As a
result, the spinlock overhead is now generated less often, and
multiple simultaneous processes can now read /proc/stat without
consuming a large amount of CPU. (BZ#1428106)

See also :

https://www.redhat.com/security/data/cve/CVE-2016-7910.html
https://www.redhat.com/security/data/cve/CVE-2017-2636.html
http://rhn.redhat.com/errata/RHSA-2017-0892.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.9
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 99338 ()

Bugtraq ID:

CVE ID: CVE-2016-7910
CVE-2017-2636

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