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[USN-1286-1] Linux kernel vulnerabilities

Posted on 03 December 2011
Ubuntu Security

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Ubuntu Security Notice USN-1286-1
December 03, 2011

linux vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Vasily Averin discovered that the NFS Lock Manager (NLM) incorrectly
handled unlock requests. A local attacker could exploit this to cause a
denial of service. (CVE-2011-2491)

Robert Swiecki discovered that mapping extensions were incorrectly handle=
d.
A local attacker could exploit this to crash the system, leading to a
denial of service. (CVE-2011-2496)

It was discovered that the wireless stack incorrectly verified SSID
lengths. A local attacker could exploit this to cause a denial of service=

or gain root privileges. (CVE-2011-2517)

Ben Pfaff discovered that Classless Queuing Disciplines (qdiscs) were bei=
ng
incorrectly handled. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2525)

A bug was discovered in the XFS filesystem's handling of pathnames. A loc=
al
attacker could exploit this to crash the system, leading to a denial of
service, or gain root privileges. (CVE-2011-4077)

Nick Bowler discovered the kernel GHASH message digest algorithm
incorrectly handled error conditions. A local attacker could exploit this=

to cause a kernel oops. (CVE-2011-4081)

A flaw was found in the Journaling Block Device (JBD). A local attacker
able to mount ext3 or ext4 file systems could exploit this to crash the
system, leading to a denial of service. (CVE-2011-4132)

A bug was found in the way headroom check was performed in
udp6_ufo_fragment() function. A remote attacker could use this flaw to
crash the system. (CVE-2011-4326)

Clement Lecigne discovered a bug in the HFS file system bounds checking.
When a malformed HFS file system is mounted a local user could crash the
system or gain root privileges. (CVE-2011-4330)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 10.04 LTS:
linux-image-2.6.32-36-386 2.6.32-36.79
linux-image-2.6.32-36-generic 2.6.32-36.79
linux-image-2.6.32-36-generic-pae 2.6.32-36.79
linux-image-2.6.32-36-ia64 2.6.32-36.79
linux-image-2.6.32-36-lpia 2.6.32-36.79
linux-image-2.6.32-36-powerpc 2.6.32-36.79
linux-image-2.6.32-36-powerpc-smp 2.6.32-36.79
linux-image-2.6.32-36-powerpc64-smp 2.6.32-36.79
linux-image-2.6.32-36-preempt 2.6.32-36.79
linux-image-2.6.32-36-server 2.6.32-36.79
linux-image-2.6.32-36-sparc64 2.6.32-36.79
linux-image-2.6.32-36-sparc64-smp 2.6.32-36.79
linux-image-2.6.32-36-versatile 2.6.32-36.79
linux-image-2.6.32-36-virtual 2.6.32-36.79

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-1286-1
CVE-2011-2491, CVE-2011-2496, CVE-2011-2517, CVE-2011-2525,
CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4326,
CVE-2011-4330

Package Information:
https://launchpad.net/ubuntu/+source/linux/2.6.32-36.79



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