CVE-2025-21917 usb: renesas_usbhs: Flush the notify_hotplug_work
A null pointer dereference in the Renesas USBHS driver causes a kernel crash during continuous unbind/bind operations, 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-2025-21917?
CVE-2025-21917 is a medium-severity vulnerability in Linux kernel, published on 1 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:
usb: renesas_usbhs: Flush the notify_hotplug_work
When performing continuous unbind/bind operations on the USB drivers available on the Renesas RZ/G2L SoC, a kernel crash with the message "Unable to handle kernel NULL pointer dereference at virtual address" may occur. This issue points to the usbhsc_notify_hotplug() function.
Flush the delayed work to avoid its execution when driver resources are unavailable.
Weakness: CWE-476
Which versions are affected by CVE-2025-21917?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21917?
Apply the vendor's patch.
Is CVE-2025-21917 being exploited?
There is no known exploitation of CVE-2025-21917 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-59925, AZL-59963, BELL-CVE-2025-21917, DEBIAN-CVE-2025-21917, GHSA-hf5w-7g55-wh36, ROOT-OS-UBUNTU-2404-CVE-2025-21917 and 1 more.