CVE-2022-50554 blk-mq: avoid double ->queue_rq() because of early timeout
A race condition in the Linux kernel block layer can cause a double queue request, leading to a kernel panic and 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-2022-50554?
CVE-2022-50554 is a medium-severity vulnerability in Linux kernel, published on 7 Oct 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:
blk-mq: avoid double ->queue_rq() because of early timeout
David Jeffery found one double ->queue_rq() issue, so far it can be triggered in VM use case because of long vmexit latency or preempt latency of vCPU pthread or long page fault in vCPU pthread, then block IO req could be timed out before queuing the request to hardware but after calling blk_mq_start_request() during ->queue_rq(), then timeout handler may handle it by requeue, then double ->queue_rq() is caused, and kernel panic.
So far, it is driver's responsibility to cover the race between timeout and completion, so it seems supposed to be solved in driver in theory, given driver has enough knowledge.
But it is really one common problem, lots of driver could have similar issue, and could be hard to fix all affected drivers, even it isn't easy for driver to handle the race. So David suggests this patch by draining in-progress ->queue_rq() for solving this issue.
Which versions are affected by CVE-2022-50554?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-50554?
Apply the vendor's patch.
Is CVE-2022-50554 being exploited?
There is no known exploitation of CVE-2022-50554 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-76767, DEBIAN-CVE-2022-50554, GHSA-rmfg-487h-3qfx, ROOT-OS-DEBIAN-11-CVE-2022-50554, ROOT-OS-UBUNTU-2204-CVE-2022-50554, UBUNTU-CVE-2022-50554.