RHEL 6 : kernel (RHSA-2012:1430)

This script is Copyright (C) 2013-2014 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 three bugs are
now available for Red Hat Enterprise Linux 6.1 Extended Update
Support.

The Red Hat Security Response Team 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.

This update fixes the following security issue :

* A flaw was found in the way socket buffers (skb) requiring TSO (TCP
segment offloading) were handled by the sfc driver. If the skb did not
fit within the minimum-size of the transmission queue, the network
card could repeatedly reset itself. A remote attacker could use this
flaw to cause a denial of service. (CVE-2012-3412, Important)

Red Hat would like to thank Ben Hutchings of Solarflare (tm) for
reporting this issue.

This update also fixes the following bugs :

* In the hpet_next_event() function, an interrupt could have occurred
between the read and write of the HPET (High Precision Event Timer)
and the value of HPET_COUNTER was then beyond that being written to
the comparator (HPET_Tn_CMP). Consequently, the timers were overdue
for up to several minutes. Now, a comparison is performed between the
value of the counter and the comparator in the HPET code. If the
counter is beyond the comparator, the '-ETIME' error code is returned,
which fixes this bug. (BZ#855280)

* Traffic to the NFS server could trigger a kernel oops in the
svc_tcp_clear_pages() function. The source code has been modified, and
the kernel oops no longer occurs in this scenario. (BZ#856104)

* A kernel oops occurred in the nf_nat code when a bogus pointer was
dereferenced in the nf_conn_nat structure. Consequently, if Source
Network Address Translation (SNAT) was performed, incorrect
information could be received by other CTS (Clear to Send) signals. A
conntrack entry is now placed in the source hash after SNAT has been
completed, which prevents the described problems. (BZ#865714)

Users should upgrade to these updated packages, which contain
backported patches to resolve these issues. The system must be
rebooted for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2012-3412.html
http://rhn.redhat.com/errata/RHSA-2012-1430.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.8
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 64061 ()

Bugtraq ID: 54763

CVE ID: CVE-2012-3412