Articles / Ubuntu: Security update for…

Ubuntu: Security update for 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.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1646-1
November 30, 2012

linux vulnerabilities
==========================================================================

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

- Ubuntu 12.10

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

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.
(CVE-2012-0957)

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 12.10:
 linux-image-3.5.0-19-generic    3.5.0-19.30
 linux-image-3.5.0-19-highbank   3.5.0-19.30
 linux-image-3.5.0-19-omap       3.5.0-19.30
 linux-image-3.5.0-19-powerpc-smp  3.5.0-19.30
 linux-image-3.5.0-19-powerpc64-smp  3.5.0-19.30

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

References:
 http://www.ubuntu.com/usn/usn-1646-1
 CVE-2012-0957, CVE-2012-4565

Package Information:
 https://launchpad.net/ubuntu/+source/linux/3.5.0-19.30
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