CVE-2014-5206
The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox protection mechanisms via a "mount -o remount" command within a user namespace.
- CVSS 2.0
- 7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C
- EPSS
- 0.37% probability · 30th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-269
- Affected
- linux/linux kernel · canonical/ubuntu linux
- Source
- cve@mitre.org
References
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a6138db815df5ee542d848318e5dae681590fccd
- http://www.openwall.com/lists/oss-security/2014/08/13/4Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/69214Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2317-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2318-1Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1129662Issue Tracking, Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccdPatch, Third Party Advisory
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a6138db815df5ee542d848318e5dae681590fccd
- http://www.openwall.com/lists/oss-security/2014/08/13/4Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/69214Third Party Advisory, VDB Entry
- http://www.ubuntu.com/usn/USN-2317-1Third Party Advisory
- http://www.ubuntu.com/usn/USN-2318-1Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1129662Issue Tracking, Patch, Third Party Advisory
- https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccdPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.