CVE-2024-57946 virtio-blk: don't keep queue frozen during system suspend
A race condition in the Linux kernel's virtio-blk driver during system suspend can cause a deadlock, leading to a 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-2024-57946?
CVE-2024-57946 is a medium-severity vulnerability in Linux kernel, published on 21 Jan 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:
virtio-blk: don't keep queue frozen during system suspend
Commit 4ce6e2db00de ("virtio-blk: Ensure no requests in virtqueues before deleting vqs.") replaces queue quiesce with queue freeze in virtio-blk's PM callbacks. And the motivation is to drain inflight IOs before suspending.
block layer's queue freeze looks very handy, but it is also easy to cause deadlock, such as, any attempt to call into bio_queue_enter() may run into deadlock if the queue is frozen in current context. There are all kinds of ->suspend() called in suspend context, so keeping queue frozen in the whole suspend context isn't one good idea. And Marek reported lockdep warning[1] caused by virtio-blk's freeze queue in virtblk_freeze().
[1] https://lore.kernel.org/linux-block/[email protected]/
Given the motivation is to drain in-flight IOs, it can be done by calling freeze & unfreeze, meantime restore to previous behavior by keeping queue quiesced during suspend.
Weakness: CWE-667
Which versions are affected by CVE-2024-57946?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-57946?
Apply the vendor's patch.
Is CVE-2024-57946 being exploited?
There is no known exploitation of CVE-2024-57946 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-57946, DEBIAN-CVE-2024-57946, GHSA-hgm3-gq5f-vjwg, UBUNTU-CVE-2024-57946.