CVE-2024-56709: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Linux Linux Kernel: from 5.14.1, before 6.1.122 (fixed in 6.1.122); from 6.2, before 6.6.68 (fixed in 6.6.68); from 6.7, before 6.12.7 (fixed in 6.12.7); version 5.14 only; version 6.13 only

Published 2024-12-29. Last modified 2026-08-04.