1. Ubuntu Security Notices
  2. USN-1507-1

USN-1507-1: Linux kernel vulnerabilities

Publication date

17 July 2012

Overview

Several security issues were fixed in the kernel.

Releases

Packages

Details

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)

An error was found in the Linux kernel's IPv6 netfilter when connection
tracking is enabled. A remote attacker could exploit this flaw to crash a
system if it is using IPv6 with the nf_contrack_ipv6 kernel module loaded.
(CVE-2012-2744)

A flaw was found in the Linux kernel's KVM (Kernel Virtual Machine) virtual
cpu setup. An unprivileged local user could exploit this flaw to crash the
system leading to a denial of service. (CVE-2012-1601)

An error was found in the Linux kernel's IPv6 netfilter when connection
tracking is enabled. A remote attacker could exploit this flaw to crash a
system if it is using IPv6 with the nf_contrack_ipv6 kernel module loaded.
(CVE-2012-2744)

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
8.04 hardy linux-image-2.6.24-32-itanium –  2.6.24-32.104
linux-image-2.6.24-32-powerpc –  2.6.24-32.104
linux-image-2.6.24-32-powerpc64-smp –  2.6.24-32.104
linux-image-2.6.24-32-sparc64 –  2.6.24-32.104
linux-image-2.6.24-32-server –  2.6.24-32.104
linux-image-2.6.24-32-openvz –  2.6.24-32.104
linux-image-2.6.24-32-386 –  2.6.24-32.104
linux-image-2.6.24-32-hppa32 –  2.6.24-32.104
linux-image-2.6.24-32-lpiacompat –  2.6.24-32.104
linux-image-2.6.24-32-mckinley –  2.6.24-32.104
linux-image-2.6.24-32-lpia –  2.6.24-32.104
linux-image-2.6.24-32-xen –  2.6.24-32.104
linux-image-2.6.24-32-hppa64 –  2.6.24-32.104
linux-image-2.6.24-32-powerpc-smp –  2.6.24-32.104
linux-image-2.6.24-32-generic –  2.6.24-32.104
linux-image-2.6.24-32-rt –  2.6.24-32.104
linux-image-2.6.24-32-virtual –  2.6.24-32.104
linux-image-2.6.24-32-sparc64-smp –  2.6.24-32.104

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References

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