cve/2024/CVE-2024-56709.md

CVE-2024-56709

Description

In the Linux kernel, the following vulnerability has been resolved:io_uring: check if iowq is killed before queuingtask work can be executed after the task has gone through io_uringtermination, whether it's the final task_work run or the fallback path.In this case, task work will find ->io_wq being already killed andnull'ed, which is a problem if it then tries to forward the request toio_queue_iowq(). Make io_queue_iowq() fail requests in this case.Note that it also checks PF_KTHREAD, because the user can first closea DEFER_TASKRUN ring and shortly after kill the task, in which case->iowq check would race.

POC

Reference

No PoCs from references.

Github

• https://github.com/cku-heise/euvd-api-doc
• https://github.com/fkie-cad/nvd-json-data-feeds
• https://github.com/oogasawa/Utility-security
• https://github.com/w4zu/Debian_security