Memory Allocation Issue in Linux Kernel Affects CAN Frame Handling

CVE-2025-21775

What is CVE-2025-21775?

A memory allocation issue has been identified in the Linux kernel that affects the handling of CAN frame structures. Specifically, if the socket buffer (skb) allocation fails, the pointer to the can_frame structure becomes NULL. Although most functions within ctucan_err_interrupt() properly handle this NULL pointer scenario, there exists a location where this check is omitted, potentially leading to undefined behavior. This vulnerability was discovered by the Linux Verification Center using the SVACE static analysis tool, emphasizing the need for consistent error handling in kernel code.

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