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

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-28 · updated 2026-10-15
Weakness: CWE-362

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.

Affected products

Linux kernel: from 3.18.139 before 3.19; from 4.4.179 before 4.5; from 4.9.170 before 4.10; from 4.14.113 before 4.15; from 4.19.36 before 5.10.258; from 5.11 before 5.15.209 — fixed in 3.19, 4.10, 4.15, 4.5, 5.10.258, 5.15.209

How to fix

Upgrade to a fixed version: Linux kernel 3.19, 4.10, 4.15, 4.5. Check the vendor advisory for mitigations.

References

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