Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2009-2692

Published: 13 August 2009

The Linux kernel 2.6.0 through 2.6.30.4, and 2.4.4 through 2.4.37.4, does not initialize all function pointers for socket operations in proto_ops structures, which allows local users to trigger a NULL pointer dereference and gain privileges by using mmap to map page zero, placing arbitrary code on this page, and then invoking an unavailable operation, as demonstrated by the sendpage operation (sock_sendpage function) on a PF_PPPOX socket.

Mitigation

Ubuntu 8.04 and later have a default setting of 65536 in
/proc/sys/vm/mmap_min_addr.  When set, this issue is blocked.  If your
value is 0, please purge the "wine" and "dosemu" packages, and reset the
value:
  sudo apt-get purge wine dosemu
  echo 65536 | sudo tee /proc/sys/vm/mmap_min_addr
On Ubuntu 6.06, we recommend the work-around detailed in the linked bug.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux-source-2.6.15
Launchpad, Ubuntu, Debian
dapper
Released (2.6.15-54.79)
hardy Does not exist

intrepid Does not exist

jaunty Does not exist

upstream
Released (2.6.31~rc6)
Patches:

upstream: http://git.kernel.org/linus/e694958388c50148389b0e9b9e9e8945cf0f1b98
linux
Launchpad, Ubuntu, Debian
upstream
Released (2.6.31~rc6)
dapper Does not exist

hardy
Released (2.6.24-24.59)
intrepid
Released (2.6.27-14.39)
jaunty
Released (2.6.28-15.49)
Patches:
upstream: http://git.kernel.org/linus/e694958388c50148389b0e9b9e9e8945cf0f1b98

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H