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CVE-2025-37802: ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING"

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-08 · updated 2026-09-14
• Weakness: CWE-667

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().

Affected products

• Linux kernel: before 6.12.26; from 6.13 before 6.14.5; 6.15-rc1, 6.15-rc2 — fixed in 6.12.26, 6.14.5

How to fix

Upgrade to a fixed version: Linux kernel 6.12.26, 6.14.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1df0d4c616138784e033ad337961b6e1a6bcd999
• https://git.kernel.org/stable/c/8f805b3746d2f41702c77cba22f94f8415fadd1a
• https://git.kernel.org/stable/c/97aabdbf7ba82da20e698f0e62917fb206d42941
• https://git.kernel.org/stable/c/cd161198e091e8a62b9bd631be970ea9a87d2d6a

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