The __do_follow_link function in fs/namei.c in the Linux kernel before 2.6.33 does not properly handle the last pathname component during use of certain filesystems, which allows local users to cause a denial of service (incorrect free operations and system crash) via an open system call.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
| Link | Tags |
|---|---|
| http://secunia.com/advisories/59262 | third party advisory broken link |
| http://www.securityfocus.com/bid/68125 | vdb entry third party advisory |
| http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=86acdca1b63e6890540fa19495cfc708beff3d8b | |
| http://secunia.com/advisories/59309 | third party advisory broken link |
| http://secunia.com/advisories/59406 | third party advisory broken link |
| http://mirror.linux.org.au/linux/kernel/v2.6/ChangeLog-2.6.33 | broken link |
| http://linux.oracle.com/errata/ELSA-2014-0771.html | third party advisory |
| http://secunia.com/advisories/59560 | third party advisory broken link |
| http://linux.oracle.com/errata/ELSA-2014-3043.html | third party advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1094363 | issue tracking patch exploit third party advisory |
| https://github.com/torvalds/linux/commit/86acdca1b63e6890540fa19495cfc708beff3d8b | third party advisory patch |