CVE-2025-37802 ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING"
A race condition in the ksmbd module causes a kernel warning and potential instability when acquiring a mutex in an uninterruptible state.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-37802?
CVE-2025-37802 is a high-severity vulnerability in Linux kernel, published on 8 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING"
wait_event_timeout() will set the state of the current task to TASK_UNINTERRUPTIBLE, before doing the condition check. This means that ksmbd_durable_scavenger_alive() will try to acquire the mutex while already in a sleeping state. The scheduler warns us by giving the following warning:
do not call blocking ops when !TASK_RUNNING; state=2 set at [<0000000061515a6f>] prepare_to_wait_event+0x9f/0x6c0 WARNING: CPU: 2 PID: 4147 at kernel/sched/core.c:10099 __might_sleep+0x12f/0x160
mutex lock is not needed in ksmbd_durable_scavenger_alive().
Weakness: CWE-667
Which versions are affected by CVE-2025-37802?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-37802?
Apply the vendor's patch.
Is CVE-2025-37802 being exploited?
There is no known exploitation of CVE-2025-37802 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-37802, DEBIAN-CVE-2025-37802, GHSA-56c5-8gc7-wj67, ROOT-OS-DEBIAN-12-CVE-2025-37802, ROOT-OS-UBUNTU-2204-CVE-2025-37802, ROOT-OS-UBUNTU-2404-CVE-2025-37802 and 1 more.