[USN-1644-1] Linux kernel vulnerabilities

John Johansen john.johansen at canonical.com
Fri Nov 30 08:07:51 UTC 2012

Ubuntu Security Notice USN-1644-1
November 30, 2012

linux vulnerabilities

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

- Ubuntu 12.04 LTS


Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel


Brad Spengler discovered a flaw in the Linux kernel's uname system call. An
unprivileged user could exploit this flaw to read kernel stack memory.

Rodrigo Freire discovered a flaw in the Linux kernel's TCP illinois
congestion control algorithm. A local attacker could use this to cause a
denial of service. (CVE-2012-4565)

Update instructions:

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-34-generic    3.2.0-34.53
  linux-image-3.2.0-34-generic-pae  3.2.0-34.53
  linux-image-3.2.0-34-highbank   3.2.0-34.53
  linux-image-3.2.0-34-omap       3.2.0-34.53
  linux-image-3.2.0-34-powerpc-smp  3.2.0-34.53
  linux-image-3.2.0-34-powerpc64-smp  3.2.0-34.53
  linux-image-3.2.0-34-virtual    3.2.0-34.53

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

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.

  CVE-2012-0957, CVE-2012-4565

Package Information:

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