USN-1286-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-1286-1

2nd December, 2011

linux vulnerabilities

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 handled.
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 being
incorrectly handled. A local attacker could exploit this to crash the
system, leading to a denial of service. (CVE-2011-2525)

Update instructions

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

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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2011-2491, CVE-2011-2496, CVE-2011-2517, CVE-2011-2525