USN-1286-1: Linux kernel vulnerabilities

3 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 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

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