Linux Kernel Vulnerability in XDP UMEM Validation

CVE-2026-43093

What is CVE-2026-43093?

A vulnerability in the Linux kernel's XDP UMEM registration process could lead to insufficient allocation of space required for the reception of minimum-sized Ethernet frames. The current validation mechanism does not adequately consider tailroom, particularly when handling multi-buffer configurations. As a result, the shared information (skb_shared_info) stored at the end of the XSK frame can become corrupted, potentially impacting network operations. To mitigate this, and to ensure compatibility with hardware that typically works in 128-byte aligned sizes, adjustments to accommodate additional tailroom must be enforced during the setup phase.

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