1. Ubuntu Security Notices
  2. USN-1606-1

USN-1606-1: Linux kernel vulnerabilities

Publication date

11 October 2012

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual
Machine) subsystem handled MSI (Message Signaled Interrupts). A local
unprivileged user could exploit this flaw to cause a denial of service or
potentially elevate privileges. (CVE-2012-2137)

A flaw was found in how the Linux kernel passed the replacement session
keyring to a child process. An unprivileged local user could exploit this
flaw to cause a denial of service (panic). (CVE-2012-2745)

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual
Machine) subsystem handled MSI (Message Signaled Interrupts). A local
unprivileged user could exploit this flaw to cause a denial of service or
potentially elevate privileges. (CVE-2012-2137)

A flaw was found in how the Linux kernel passed the replacement session
keyring to a child process. An unprivileged local user could exploit this
flaw to cause a denial of service (panic). (CVE-2012-2745)

Update instructions

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

Learn more about how to get the fixes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. If you use linux-restricted-modules, you have to update that package as well to get modules which work with the new kernel version. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-server, linux-powerpc), a standard system upgrade will automatically perform this as well.

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

Ubuntu Release Package Version
10.04 lucid linux-image-2.6.32-44-ia64 –  2.6.32-44.98
linux-image-2.6.32-44-386 –  2.6.32-44.98
linux-image-2.6.32-44-powerpc –  2.6.32-44.98
linux-image-2.6.32-44-preempt –  2.6.32-44.98
linux-image-2.6.32-44-generic-pae –  2.6.32-44.98
linux-image-2.6.32-44-sparc64 –  2.6.32-44.98
linux-image-2.6.32-44-server –  2.6.32-44.98
linux-image-2.6.32-44-powerpc64-smp –  2.6.32-44.98
linux-image-2.6.32-44-sparc64-smp –  2.6.32-44.98
linux-image-2.6.32-44-virtual –  2.6.32-44.98
linux-image-2.6.32-44-versatile –  2.6.32-44.98
linux-image-2.6.32-44-generic –  2.6.32-44.98
linux-image-2.6.32-44-lpia –  2.6.32-44.98
linux-image-2.6.32-44-powerpc-smp –  2.6.32-44.98

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References

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