Debian Security Advisory

DSA-1928-1 linux-2.6.24 -- privilege escalation/denial of service/sensitive memory leak

Date Reported:
05 Nov 2009
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2009-2846, CVE-2009-2847, CVE-2009-2848, CVE-2009-2849, CVE-2009-2903, CVE-2009-2908, CVE-2009-2909, CVE-2009-2910, CVE-2009-3001, CVE-2009-3002, CVE-2009-3228, CVE-2009-3238, CVE-2009-3286, CVE-2009-3547, CVE-2009-3612, CVE-2009-3613, CVE-2009-3620, CVE-2009-3621.
More information:

Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service, sensitive memory leak or privilege escalation. The Common Vulnerabilities and Exposures project identifies the following problems:

  • CVE-2009-2846

    Michael Buesch noticed a typing issue in the eisa-eeprom driver for the hppa architecture. Local users could exploit this issue to gain access to restricted memory.

  • CVE-2009-2847

    Ulrich Drepper noticed an issue in the do_sigalstack routine on 64-bit systems. This issue allows local users to gain access to potentially sensitive memory on the kernel stack.

  • CVE-2009-2848

    Eric Dumazet discovered an issue in the execve path, where the clear_child_tid variable was not being properly cleared. Local users could exploit this issue to cause a denial of service (memory corruption).

  • CVE-2009-2849

    Neil Brown discovered an issue in the sysfs interface to md devices. When md arrays are not active, local users can exploit this vulnerability to cause a denial of service (oops).

  • CVE-2009-2903

    Mark Smith discovered a memory leak in the appletalk implementation. When the appletalk and ipddp modules are loaded, but no ipddp"N" device is found, remote attackers can cause a denial of service by consuming large amounts of system memory.

  • CVE-2009-2908

    Loic Minier discovered an issue in the eCryptfs filesystem. A local user can cause a denial of service (kernel oops) by causing a dentry value to go negative.

  • CVE-2009-2909

    Arjan van de Ven discovered an issue in the AX.25 protocol implementation. A specially crafted call to setsockopt() can result in a denial of service (kernel oops).

  • CVE-2009-2910

    Jan Beulich discovered the existence of a sensitive kernel memory leak. Systems running the 'amd64' kernel do not properly sanitize registers for 32-bit processes.

  • CVE-2009-3001

    Jiri Slaby fixed a sensitive memory leak issue in the ANSI/IEEE 802.2 LLC implementation. This is not exploitable in the Debian lenny kernel as root privileges are required to exploit this issue.

  • CVE-2009-3002

    Eric Dumazet fixed several sensitive memory leaks in the IrDA, X.25 PLP (Rose), NET/ROM, Acorn Econet/AUN, and Controller Area Network (CAN) implementations. Local users can exploit these issues to gain access to kernel memory.

  • CVE-2009-3228

    Eric Dumazet reported an instance of uninitialized kernel memory in the network packet scheduler. Local users may be able to exploit this issue to read the contents of sensitive kernel memory.

  • CVE-2009-3238

    Linus Torvalds provided a change to the get_random_int() function to increase its randomness.

  • CVE-2009-3286

    Eric Paris discovered an issue with the NFSv4 server implementation. When an O_EXCL create fails, files may be left with corrupted permissions, possibly granting unintentional privileges to other local users.

  • CVE-2009-3547

    Earl Chew discovered a NULL pointer dereference issue in the pipe_rdwr_open function which can be used by local users to gain elevated privileges.

  • CVE-2009-3612

    Jiri Pirko discovered a typo in the initialization of a structure in the netlink subsystem that may allow local users to gain access to sensitive kernel memory.

  • CVE-2009-3613

    Alistair Strachan reported an issue in the r8169 driver. Remote users can cause a denial of service (IOMMU space exhaustion and system crash) by transmitting a large amount of jumbo frames.

  • CVE-2009-3620

    Ben Hutchings discovered an issue in the DRM manager for ATI Rage 128 graphics adapters. Local users may be able to exploit this vulnerability to cause a denial of service (NULL pointer dereference).

  • CVE-2009-3621

    Tomoki Sekiyama discovered a deadlock condition in the UNIX domain socket implementation. Local users can exploit this vulnerability to cause a denial of service (system hang).

For the oldstable distribution (etch), this problem has been fixed in version 2.6.24-6~etchnhalf.9etch1.

We recommend that you upgrade your linux-2.6.24 packages.

Note: Debian 'etch' includes linux kernel packages based upon both the 2.6.18 and 2.6.24 linux releases. All known security issues are carefully tracked against both packages and both packages will receive security updates until security support for Debian 'etch' concludes. However, given the high frequency at which low-severity security issues are discovered in the kernel and the resource requirements of doing an update, lower severity 2.6.18 and 2.6.24 updates will typically release in a staggered or "leap-frog" fashion.

Fixed in:

Debian GNU/Linux 4.0 (etch)

Architecture-independent component:
HP Precision:
Intel IA-32:
Intel IA-64:
Little-endian MIPS:

MD5 checksums of the listed files are available in the original advisory.