The befs_follow_link function in fs/befs/linuxvfs.c in the Linux kernel before...

Vulnerability Description

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.

References

• http://www.openwall.com/lists/oss-security/2011/08/19/5
• http://www.pre-cert.de/advisories/PRE-SA-2011-06.txt
• http://www.securityfocus.com/bid/49256
• http://www.openwall.com/lists/oss-security/2011/08/19/1
• http://www.securityfocus.com/archive/1/519387/100/0/threaded
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=338d0f0a6fbc82407864606f5b64b75aeb3c70f2
• https://exchange.xforce.ibmcloud.com/vulnerabilities/69343
• http://securityreason.com/securityalert/8360
• http://www.kernel.org/pub/linux/kernel/v3.0/testing/ChangeLog-3.1-rc3