Description
The fs_pin implementation in the Linux kernel before 4.0.5 does not ensure the internal consistency of a certain list data structure, which allows local users to cause a denial of service (system crash) by leveraging user-namespace root access for an MNT_DETACH umount2 system call, related to fs/fs_pin.c and include/linux/fs_pin.h.
References
- [oss-security] 20150529 CVE request Linux kernel: ns: user namespaces panic mailing-list
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.5
- https://bugzilla.redhat.com/show_bug.cgi?id=1249849
- [oss-security] 20150529 Re: CVE request Linux kernel: ns: user namespaces panic mailing-list
- [oss-security] 20150604 Re: Re: CVE request Linux kernel: ns: user namespaces panic mailing-list
- https://github.com/torvalds/linux/commit/820f9f147dcce2602eefd9b575bbbd9ea14f0953
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=820f9f147dcce2602eefd9b575bbbd9ea14f0953