CVE-2025-40325 md/raid10: wait barrier before returning discard request with REQ_NOWAIT
A missing barrier wait in Linux kernel RAID10 discard handling can cause system instability or crashes when processing non-blocking discard requests.
- 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-2025-40325?
CVE-2025-40325 is a medium-severity denial of service vulnerability in Linux kernel, published on 18 Apr 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:
md/raid10: wait barrier before returning discard request with REQ_NOWAIT
raid10_handle_discard should wait barrier before returning a discard bio which has REQ_NOWAIT. And there is no need to print warning calltrace if a discard bio has REQ_NOWAIT flag. Quality engineer usually checks dmesg and reports error if dmesg has warning/error calltrace.
Which versions are affected by CVE-2025-40325?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-40325?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-40325 being exploited?
There is no known exploitation of CVE-2025-40325 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-62773, AZL-69731, BELL-CVE-2025-40325, DEBIAN-CVE-2025-40325, GHSA-vf7h-45fw-j88p, ROOT-OS-DEBIAN-12-CVE-2025-40325 and 4 more.