DMA Mapping Leak in Linux Kernel's STMMAC Driver

CVE-2026-98131

What is CVE-2026-98131?

A vulnerability exists in the STMMAC driver of the Linux kernel, where a failure in DMA mapping within the stmmac_tso_xmit() function leads to a leak of DMA mappings. When a DMA mapping for a fragment fails, the already established mappings for previous parts of the frame are not properly released, resulting in potential resource exhaustion. The issue is addressed by ensuring that all previously mapped descriptors are unbound and released correctly, thus preventing the leakage of DMA mappings and enhancing overall system stability.

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