Ubuntu Security Notice 1644-1 - 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.
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Ubuntu Security Notice USN-1644-1
November 30, 2012
linux vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
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 12.04 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.
References:
http://www.ubuntu.com/usn/usn-1644-1
CVE-2012-0957, CVE-2012-4565
Package Information:
https://launchpad.net/ubuntu/+source/linux/3.2.0-34.53