CVE-2024-56709

io_uring: check if iowq is killed before queuing

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.

N/A

CVSS

Severity:

EPSS 0.04%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/534d59ab38010aada88390db65985e65d0de7d9e
https://git.kernel.org/stable/c/2ca94c8de36091067b9ce7527ae8db3812d38781
https://git.kernel.org/stable/c/4f95a2186b7f2af09331e1e8069bcaf34fe019cf
https://git.kernel.org/stable/c/dbd2ca9367eb19bc5e269b8c58b0b1514ada9156

Frequently Asked Questions

What is the severity of CVE-2024-56709?: CVE-2024-56709 has not yet been assigned a CVSS score.
How to fix CVE-2024-56709?: To fix CVE-2024-56709, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-56709 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-56709 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-56709?: CVE-2024-56709 affects Linux Linux, Linux Linux.

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