CVE ID : CVE-2024-56709

Published : Dec. 29, 2024, 9:15 a.m. | 1 hour, 3 minutes ago

Description : In the Linux kernel, the following vulnerability has been resolved:

io_uring: check if iowq is killed before queuing

task work can be executed after the task has gone through io_uring
termination, whether it’s the final task_work run or the fallback path.
In this case, task work will find ->io_wq being already killed and
null’ed, which is a problem if it then tries to forward the request to
io_queue_iowq(). Make io_queue_iowq() fail requests in this case.

Note that it also checks PF_KTHREAD, because the user can first close
a DEFER_TASKRUN ring and shortly after kill the task, in which case
->iowq check would race.

Severity: 0.0 | NA

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