CVE-2024-58042 rhashtable: Fix potential deadlock by moving schedule_work outside lock
A potential deadlock in the Linux kernel rhashtable component can cause a denial of service by triggering circular locking dependencies.
- 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-2024-58042?
CVE-2024-58042 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 2025. 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:
rhashtable: Fix potential deadlock by moving schedule_work outside lock
Move the hash table growth check and work scheduling outside the rht lock to prevent a possible circular locking dependency.
The original implementation could trigger a lockdep warning due to a potential deadlock scenario involving nested locks between rhashtable bucket, rq lock, and dsq lock. By relocating the growth check and work scheduling after releasing the rth lock, we break this potential deadlock chain.
This change expands the flexibility of rhashtable by removing restrictive locking that previously limited its use in scheduler and workqueue contexts.
Import to say that this calls rht_grow_above_75(), which reads from struct rhashtable without holding the lock, if this is a problem, we can move the check to the lock, and schedule the workqueue after the lock.
Modified so that atomic_inc is also moved outside of the bucket lock along with the growth above 75% check.
Weakness: CWE-667
Which versions are affected by CVE-2024-58042?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-58042?
Apply the vendor's patch.
Is CVE-2024-58042 being exploited?
There is no known exploitation of CVE-2024-58042 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-58042, DEBIAN-CVE-2024-58042, GHSA-mffp-559q-rchq, UBUNTU-CVE-2024-58042.