CVE-2025-21775 can: ctucanfd: handle skb allocation failure

What is CVE-2025-21775?

CVE-2025-21775 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: ctucanfd: handle skb allocation failure

If skb allocation fails, the pointer to struct can_frame is NULL. This is actually handled everywhere inside ctucan_err_interrupt() except for the only place.

Add the missed NULL check.

Found by Linux Verification Center (linuxtesting.org) with SVACE static analysis tool.

Weakness: CWE-476

Which versions are affected by CVE-2025-21775?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-21775?

Apply the vendor's patch.

Is CVE-2025-21775 being exploited?

There is no known exploitation of CVE-2025-21775 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-57884, BELL-CVE-2025-21775, DEBIAN-CVE-2025-21775, GHSA-5v6r-j86q-gwmh, ROOT-OS-UBUNTU-2404-CVE-2025-21775, UBUNTU-CVE-2025-21775.