What’s Vulnerable › Vulnerabilities

CVE-2014-5206

• Severity: high (CVSS 7.2 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2014-08-18 · updated 2026-06-17
• Weakness: CWE-269

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.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04
• Linux kernel: from 3.8 before 3.10.55; from 3.11 before 3.12.27; from 3.13 before 3.14.19; from 3.15 before 3.16.3 — fixed in 3.10.55, 3.12.27, 3.14.19, 3.16.3

How to fix

Upgrade to a fixed version: Linux kernel 3.10.55, 3.12.27, 3.14.19, 3.16.3. Check the vendor advisory for mitigations.

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/2014/08/13/4
• http://www.securityfocus.com/bid/69214
• http://www.ubuntu.com/usn/USN-2317-1
• http://www.ubuntu.com/usn/USN-2318-1
• https://bugzilla.redhat.com/show_bug.cgi?id=1129662
• https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccd
• http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a6138db815df5ee542d848318e5dae681590fccd
• http://www.openwall.com/lists/oss-security/2014/08/13/4
• http://www.securityfocus.com/bid/69214
• http://www.ubuntu.com/usn/USN-2317-1
• http://www.ubuntu.com/usn/USN-2318-1

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