Debian Security Advisory

DSA-2443-1 linux-2.6 -- privilege escalation/denial of service

Date Reported:
26 Mar 2012
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2009-4307, CVE-2011-1833, CVE-2011-4347, CVE-2012-0045, CVE-2012-1090, CVE-2012-1097.
More information:

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-2009-4307

    Nageswara 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-2011-1833

    Vasiliy Kulikov of Openwall and Dan Rosenberg discovered an information leak in the eCryptfs filesystem. Local users were able to mount arbitrary directories.

  • CVE-2011-4347

    Sasha 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-2012-0045

    Stephan 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-2012-1090

    CAI 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-2012-1097

    H. 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-linux 2.6.32-1um-4+41squeeze2

We recommend that you upgrade your linux-2.6 and user-mode-linux packages.

Thanks to Micah Anderson for proof reading this text.