CVE-2025-37906 ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd
A race condition in the Linux kernel ublk driver can cause a kernel crash, leading to 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-2025-37906?
CVE-2025-37906 is a high-severity vulnerability in Linux kernel, published on 20 May 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:
ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd
ublk_cancel_cmd() calls io_uring_cmd_done() to complete uring_cmd, but we may have scheduled task work via io_uring_cmd_complete_in_task() for dispatching request, then kernel crash can be triggered.
Fix it by not trying to canceling the command if ublk block request is started.
Weakness: CWE-362
Which versions are affected by CVE-2025-37906?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-37906?
Apply the vendor's patch.
Is CVE-2025-37906 being exploited?
There is no known exploitation of CVE-2025-37906 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-37906, DEBIAN-CVE-2025-37906, GHSA-mrmf-653p-5vh8, ROOT-OS-DEBIAN-13-CVE-2025-37906, ROOT-OS-UBUNTU-2404-CVE-2025-37906, UBUNTU-CVE-2025-37906.