CVE-2011-2942

Published: 21 October 2011

A certain Red Hat patch to the __br_deliver function in net/bridge/br_forward.c in the Linux kernel 2.6.18 on Red Hat Enterprise Linux (RHEL) 5 allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging connectivity to a network interface that uses an Ethernet bridge device.

From the Ubuntu security team

Qianfeng Zhang discovered that the bridge networking interface incorrectly handled certain network packets. A remote attacker could exploit this to crash the system, leading to a denial of service.

Priority

Medium

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
Patches:
Vendor: https://rhn.redhat.com/errata/RHSA-2011-1386.html
Introduced by 0e34e93177fb1f642cab080e0bde664c06c7183a
Fixed by 91d2c34a4eed32876ca333b0ca44f3bc56645805
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-ec2
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-lts-backport-maverick
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-lts-backport-natty
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-lts-backport-oneiric
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-mvl-dove
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (2.6.36~rc1)

Notes

AuthorNote
apw
Redhat claims the fix below fixes the issue:
bridge: fix use after free in __br_deliver
this looks to be fixed upstream by:
bridge: Fix netpoll support
only a very small part of this delivering the actual fix.
This was introduced in the patch below:
netpoll: add generic support for bridge and bonding devices
For maverick netpoll is re-disabled for bridge by the commit below:
bridge: Partially disable netpoll support

References

Bugs