Debian DSA-2094-1 : linux-2.6 - privilege escalation/denial of service/information leak
Critical Nessus Plugin ID 48387
SynopsisThe remote Debian host is missing a security-related update.
DescriptionSeveral 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-2009-4895 Kyle Bader reported an issue in the tty subsystem that allows local users to create a denial of service (NULL pointer dereference).
- CVE-2010-2226 Dan Rosenberg reported an issue in the xfs filesystem that allows local users to copy and read a file owned by another user, for which they only have write permissions, due to a lack of permission checking in the XFS_SWAPEXT ioctl.
- CVE-2010-2240 Rafal Wojtczuk reported an issue that allows users to obtain escalated privileges. Users must already have sufficient privileges to execute or connect clients to an Xorg server.
- CVE-2010-2248 Suresh Jayaraman discovered an issue in the CIFS filesystem. A malicious file server can set an incorrect 'CountHigh' value, resulting in a denial of service (BUG_ON() assertion).
- CVE-2010-2521 Neil Brown reported an issue in the NFSv4 server code. A malicious client could trigger a denial of service (Oops) on a server due to a bug in the read_buf() routine.
- CVE-2010-2798 Bob Peterson reported an issue in the GFS2 file system.
A file system user could cause a denial of service (Oops) via certain rename operations.
- CVE-2010-2803 Kees Cook reported an issue in the DRM (Direct Rendering Manager) subsystem. Local users with sufficient privileges (local X users or members of the 'video' group on a default Debian install) could acquire access to sensitive kernel memory.
- CVE-2010-2959 Ben Hawkes discovered an issue in the AF_CAN socket family. An integer overflow condition may allow local users to obtain elevated privileges.
- CVE-2010-3015 Toshiyuki Okajima reported an issue in the ext4 filesystem. Local users could trigger a denial of service (BUG assertion) by generating a specific set of filesystem operations.
This update also includes fixes a regression introduced by a previous update. See the referenced Debian bug page for details.
SolutionUpgrade the linux-2.6 and user-mode-linux packages.
For the stable distribution (lenny), this problem has been fixed in version 2.6.26-24lenny1.
The following matrix lists additional source packages that were rebuilt for compatibility with or to take advantage of this update :
Debian 5.0 (lenny) user-mode-linux 2.6.26-1um-2+24lenny1 Updates for arm and mips will be released as they become available.