Description
The nfs_can_extend_write function in fs/nfs/write.c in the Linux kernel before 3.13.3 relies on a write delegation to extend a write operation without a certain up-to-date verification, which allows local users to obtain sensitive information from kernel memory in opportunistic circumstances by writing to a file in an NFS filesystem and then reading the same file.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
n/a n/a
n/aaffected
References
- http://www.ubuntu.com/usn/USN-2137-1 ↗
- http://www.ubuntu.com/usn/USN-2140-1 ↗
- https://github.com/torvalds/linux/commit/263b4509ec4d47e0da3e753f85a39ea12d1eff24 ↗
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=263b4509ec4d47e0da3e753f85a39ea12d1eff24 ↗
- http://www.openwall.com/lists/oss-security/2014/02/20/16 ↗
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.13.3 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=1066939 ↗