Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2009-4307Nageswara R Sastry reported an issue in the ext4 filesystem. Local users with the privileges to mount a filesystem can cause a denial of service (BUG) by providing a s_log_groups_per_flex value greater than 31. CVE-2011-1833Vasiliy Kulikov of Openwall and Dan Rosenberg discovered an information leak in the eCryptfs filesystem. Local users were able to mount arbitrary directories. CVE-2011-4347Sasha Levin reported an issue in the device assignment functionality in KVM. Local users with permission to access /dev/kvm could assign unused pci devices to a guest and cause a denial of service (crash). CVE-2012-0045Stephan Barwolf reported an issue in KVM. Local users in a 32-bit guest running on a 64-bit system can crash the guest with a syscall instruction. CVE-2012-1090CAI Qian reported an issue in the CIFS filesystem. A reference count leak can occur during the lookup of special files, resulting in a denial of service (oops) on umount. CVE-2012-1097H. Peter Anvin reported an issue in the regset infrastructure. Local users can cause a denial of service (NULL pointer dereference) by triggering the write methods of readonly regsets.

For the stable distribution (squeeze), this problem has been fixed in version 2.6.32-41squeeze2. The following matrix lists additional source packages that were rebuilt for compatibility with or to take advantage of this update: Debian 6.0 (squeeze)user-mode-linux2.6.32-1um-4+41squeeze2We recommend that you upgrade your linux-2.6 and user-mode-linux packages. Thanks to Micah Anderson for proof reading this text.

The Linux kernel is the core of the Linux operating system.

linux-2.6 on Debian Linux

This check tests the installed software version using the apt package manager.

• http://www.debian.org/security/2012/dsa-2443.html

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Updated on 2015-03-25