CVE-2025-39803 scsi: ufs: core: Remove WARN_ON_ONCE() call from ufshcd_uic_cmd_compl()
A kernel warning in the UFS driver can be triggered by specific interrupt states, potentially leading to a 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-2025-39803?
CVE-2025-39803 is a high-severity denial of service vulnerability in Linux kernel, published on 15 Sep 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:
scsi: ufs: core: Remove WARN_ON_ONCE() call from ufshcd_uic_cmd_compl()
The UIC completion interrupt may be disabled while an UIC command is being processed. When the UIC completion interrupt is reenabled, an UIC interrupt is triggered and the WARN_ON_ONCE(!cmd) statement is hit. Hence this patch that removes this kernel warning.
Weakness: CWE-617
Which versions are affected by CVE-2025-39803?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-39803?
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-2025-39803 being exploited?
There is no known exploitation of CVE-2025-39803 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-39803, DEBIAN-CVE-2025-39803, GHSA-xc8h-hh3v-5wpc, UBUNTU-CVE-2025-39803.