accel/ethosu: fix arithmetic issues in dma_length()

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Summary

CVECVE-2026-53171
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:34 UTC
Updated2026-06-25 09:16:34 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: accel/ethosu: fix arithmetic issues in dma_length() dma_length() derives DMA region usage from command stream values and updates region_size[]: len = ((len + stride[0]) * size0 + stride[1]) * size1 region_size[region] = max(..., len + dma->offset) Several arithmetic issues can corrupt the derived region size: - signed stride values may underflow when added to len - intermediate multiplications may overflow - len + dma->offset may overflow during region_size updates - dma_length() error returns were not validated by the caller region_size[] is later used by ethosu_job.c to validate command stream accesses against GEM buffer sizes. Arithmetic wraparound can therefore under-report region usage and bypass the bounds validation. Fix by validating signed additions, using overflow helpers for multiplications and offset updates, and propagating dma_length() failures to the caller.

Risk And Classification

EPSS: 0.001720000 probability, percentile 0.068660000 (date 2026-06-26)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b 6bb73845d1855ceaf50e397175e5979a7bdf69bc git Not specified
CNA Linux Linux affected 5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b ee6d9b6e51626f259c6f0e38d94f91be4fd14754 git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ee6d9b6e51626f259c6f0e38d94f91be4fd14754 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6bb73845d1855ceaf50e397175e5979a7bdf69bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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