- Vulnerability/
- CVE-2024-56709
CVE-2024-56709: io_uring: check if iowq is killed before queuing
First published: Sun Dec 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| debian/linux | <=6.12.20-1<=6.12.21-1 | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 |
| debian/linux-6.1 | 6.1.129-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/2ca94c8de36091067b9ce7527ae8db3812d38781
- https://git.kernel.org/stable/c/4f95a2186b7f2af09331e1e8069bcaf34fe019cf
- https://git.kernel.org/stable/c/534d59ab38010aada88390db65985e65d0de7d9e
- https://git.kernel.org/stable/c/dbd2ca9367eb19bc5e269b8c58b0b1514ada9156
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56709
- https://nvd.nist.gov/vuln/detail/CVE-2024-56709
- https://launchpad.net/bugs/cve/CVE-2024-56709
- https://security-tracker.debian.org/tracker/CVE-2024-56709
- https://ubuntu.com/security/CVE-2024-56709
- https://git.kernel.org/linus/dbd2ca9367eb19bc5e269b8c58b0b1514ada9156
Frequently Asked Questions
What is the severity of CVE-2024-56709?
CVE-2024-56709 has a high severity rating as it could allow task work to be executed improperly after termination.
How do I fix CVE-2024-56709?
To mitigate CVE-2024-56709, update your Linux kernel to the latest version where this vulnerability has been addressed.
What versions of the Linux kernel are affected by CVE-2024-56709?
CVE-2024-56709 affects multiple versions of the Linux kernel that utilize io_uring functionality.
Is CVE-2024-56709 being actively exploited?
As of now, there have been no confirmed reports of active exploitation for CVE-2024-56709.
What impact does CVE-2024-56709 have on system performance?
CVE-2024-56709 may lead to unexpected behavior in task work execution, potentially affecting system stability and performance.
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