Integer overflow in Linux kernel - CVE-2026-53171

Detailed vulnerability description

The vulnerability allows a local user to bypass bounds validation and cause out-of-bounds memory access.

The vulnerability exists due to integer overflow and underflow handling errors in dma_length() and command stream validation in the Ethos-U accelerator driver when processing command stream DMA parameters. A local user can supply a specially crafted command stream to under-report region usage and bypass bounds validation to cause out-of-bounds memory access.

The issue affects region_size[] calculations that are later used to validate command stream accesses against GEM buffer sizes.

How to mitigate CVE-2026-53171

Sources

• https://git.kernel.org/stable/c/6bb73845d1855ceaf50e397175e5979a7bdf69bc
• https://git.kernel.org/stable/c/ee6d9b6e51626f259c6f0e38d94f91be4fd14754