Advisory Published

USN-1243-1: Linux kernel vulnerabilities

First published: Tue Oct 25 2011(Updated: )

It was discovered that the security fix for CVE-2010-4250 introduced a regression. A remote attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-1479) Vasiliy Kulikov discovered that taskstats did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2494) Vasiliy Kulikov discovered that /proc/PID/io did not enforce access restrictions. A local attacker could exploit this to read certain information, leading to a loss of privacy. (CVE-2011-2495) It was discovered that the EXT4 filesystem contained multiple off-by-one flaws. A local attacker could exploit this to crash the system, leading to a denial of service. (CVE-2011-2695) Christian Ohm discovered that the perf command looks for configuration files in the current directory. If a privileged user were tricked into running perf in a directory containing a malicious configuration file, an attacker could run arbitrary commands and possibly gain privileges. (CVE-2011-2905) Vasiliy Kulikov discovered that the Comedi driver did not correctly clear memory. A local attacker could exploit this to read kernel stack memory, leading to a loss of privacy. (CVE-2011-2909) Dan Kaminsky discovered that the kernel incorrectly handled random sequence number generation. An attacker could use this flaw to possibly predict sequence numbers and inject packets. (CVE-2011-3188) Yogesh Sharma discovered that CIFS did not correctly handle UNCs that had no prefixpaths. A local attacker with access to a CIFS partition could exploit this to crash the system, leading to a denial of service. (CVE-2011-3363)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-2.6.35-30-powerpc-smp<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-versatile<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-server<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-powerpc64-smp<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-virtual<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-generic-pae<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-omap<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-generic<2.6.35-30.61
2.6.35-30.61
=10.10
All of
ubuntu/linux-image-2.6.35-30-powerpc<2.6.35-30.61
2.6.35-30.61
=10.10

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