CVE-2025-21773 can: etas_es58x: fix potential NULL pointer dereference on udev->serial
A local attacker can cause a denial of service by spoofing a USB device with a null serial number, triggering a kernel crash in the etas_es58x driver.
- 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-2025-21773?
CVE-2025-21773 is a medium-severity vulnerability in Linux kernel, published on 27 Feb 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:
can: etas_es58x: fix potential NULL pointer dereference on udev->serial
The driver assumed that es58x_dev->udev->serial could never be NULL. While this is true on commercially available devices, an attacker could spoof the device identity providing a NULL USB serial number. That would trigger a NULL pointer dereference.
Add a check on es58x_dev->udev->serial before accessing it.
Weakness: CWE-476
Which versions are affected by CVE-2025-21773?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21773?
Apply the vendor's patch.
Is CVE-2025-21773 being exploited?
There is no known exploitation of CVE-2025-21773 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-57929, BELL-CVE-2025-21773, DEBIAN-CVE-2025-21773, GHSA-p4x7-wjcj-5xfj, ROOT-OS-UBUNTU-2404-CVE-2025-21773, UBUNTU-CVE-2025-21773.