RHEL 5 : kernel (RHSA-2010:0893)

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 5.3 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 :

* Buffer overflow flaws were found in the Linux kernel's
implementation of the server-side External Data Representation (XDR)
for the Network File System (NFS) version 4. An attacker on the local
network could send a specially-crafted large compound request to the
NFSv4 server, which could possibly result in a kernel panic (denial of
service) or, potentially, code execution. (CVE-2010-2521, Important)

This update also fixes the following bugs :

* A race condition existed when generating new process IDs with the
result that the wrong process could have been signaled or killed
accidentally, leading to various application faults. This update
detects and disallows the reuse of PID numbers. (BZ#638864)

* When multiple JBD-based (Journaling Block Device) file systems were
mounted concurrently, and no other JBD-based file systems were already
mounted, a race could occur between JBD slab cache creation and
deletion. (BZ#645653)

* A missing memory barrier caused a race condition in the AIO
subsystem between the read_events() and aio_complete() functions. This
may have caused a thread in read_events() to sleep indefinitely,
possibly causing an application hang. (BZ#638868)

Users should 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-2010-2521.html
http://rhn.redhat.com/errata/RHSA-2010-0893.html

Solution :

Update the affected packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 63958 ()

Bugtraq ID: 42249

CVE ID: CVE-2010-2521