CVE-2023-52704 freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL
A race condition in the Linux kernel's usermode helper execution can lead to a use-after-free or crash when a process is killed, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-52704?
CVE-2023-52704 is a high-severity vulnerability in Linux kernel, published on 21 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL
Tetsuo-San noted that commit f5d39b020809 ("freezer,sched: Rewrite core freezer logic") broke call_usermodehelper_exec() for the KILLABLE case.
Specifically it was missed that the second, unconditional, wait_for_completion() was not optional and ensures the on-stack completion is unused before going out-of-scope.
Which versions are affected by CVE-2023-52704?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52704?
Apply the vendor's patch.
Is CVE-2023-52704 being exploited?
There is no known exploitation of CVE-2023-52704 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52704, DEBIAN-CVE-2023-52704, GHSA-6qj4-5856-5f22, UBUNTU-CVE-2023-52704.