Use-after-free vulnerability in the path_openat function in fs/namei.c in the Linux kernel 3.x and 4.x before 4.0.4 allows local users to cause a denial of service or possibly have unspecified other impact via O_TMPFILE filesystem operations that leverage a duplicate cleanup operation.
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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 |
|---|---|
| https://source.android.com/security/bulletin/2017-01-01.html | third party advisory patch |
| http://twitter.com/grsecurity/statuses/597127122910490624 | broken link |
| http://www.ubuntu.com/usn/USN-2680-1 | third party advisory vendor advisory |
| http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.4 | release notes vendor advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=1250047 | issue tracking third party advisory patch |
| http://www.securityfocus.com/bid/76142 | vdb entry third party advisory |
| http://www.debian.org/security/2015/dsa-3329 | third party advisory vendor advisory |
| https://github.com/torvalds/linux/commit/f15133df088ecadd141ea1907f2c96df67c729f0 | third party advisory patch |
| http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f15133df088ecadd141ea1907f2c96df67c729f0 | patch vendor advisory |
| http://www.ubuntu.com/usn/USN-2681-1 | third party advisory vendor advisory |
| http://www.openwall.com/lists/oss-security/2015/08/01/5 | third party advisory mailing list |