CVE-2011-2928

Published: 29 August 2011

The befs_follow_link function in fs/befs/linuxvfs.c in the Linux kernel before 3.1-rc3 does not validate the length attribute of long symlinks, which allows local users to cause a denial of service (incorrect pointer dereference and OOPS) by accessing a long symlink on a malformed Be filesystem.

From the Ubuntu Security Team

Time Warns discovered that long symlinks were incorrectly handled on Be filesystems. A local attacker could exploit this with a malformed Be filesystem and crash the system, leading to a denial of service.

Priority

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	hardy	Released (2.6.24-29.94)
	lucid	Released (2.6.32-35.78)
	maverick	Released (2.6.35-30.60)
	natty	Released (2.6.38-12.51)
	oneiric	Not vulnerable (3.0.0-10.16)
	upstream	Released (3.1~rc3)
	Patches: upstream: http://git.kernel.org/linus/338d0f0a6fbc82407864606f5b64b75aeb3c70f2
linux-ec2 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-319.39)
	maverick	Ignored (end of life)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc3)
linux-fsl-imx51 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.31-611.29)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc3)
linux-lts-backport-maverick Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.35-30.60~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc3)
linux-lts-backport-natty Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.38-12.51~lucid1)
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc3)
linux-lts-backport-oneiric Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Not vulnerable
	maverick	Does not exist
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc3)
linux-mvl-dove Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Released (2.6.32-219.37)
	maverick	Released (2.6.32-419.37)
	natty	Does not exist
	oneiric	Does not exist
	upstream	Released (3.1~rc3)
linux-ti-omap4 Launchpad, Ubuntu, Debian	hardy	Does not exist
	lucid	Does not exist
	maverick	Released (2.6.35-903.25)
	natty	Released (2.6.38-1209.16)
	oneiric	Not vulnerable (3.0.0-1205.10)
	upstream	Released (3.1~rc3)

References

Bugs

https://launchpad.net/bugs/834124

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