CVE-2024-56709 - "Linux Kernel io_uring Task Work – Deadlock Prevention"

CVE-2024-56709 - "Linux Kernel io_uring Task Work – Deadlock Prevention"

https://cvefeed.io/rssfeed/latest.atom / Sun, 12/29/2024 - 12:22
CVE ID : CVE-2024-56709
Published : Dec. 29, 2024, 9:15 a.m. | 2 hours, 7 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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