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…

Overview

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

• linux_kernel >= 3.18.139, < 3.19
• linux_kernel >= 4.4.179, < 4.5
• linux_kernel >= 4.9.170, < 4.10
• linux_kernel >= 4.14.113, < 4.15
• linux_kernel >= 4.19.36, < 5.10.258
• linux_kernel >= 5.11, < 5.15.209
• linux_kernel >= 5.16, < 6.1.175
• linux_kernel >= 6.2, < 6.6.140
• linux_kernel >= 6.7, < 6.12.88
• linux_kernel >= 6.13, < 6.18.30
• linux_kernel >= 6.19, < 7.0.7
• linux_kernel = 7.1

Remediation

Upgrade past the affected range:

• linux_kernel 7.0.7