accel/ethosu: fix arithmetic issues in dma_length()_CVE-2026-53171

8.8 / 10

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Description

In 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.

AI Analysis

Arithmetic issues in dma_length() can lead to under-reporting of region usage and bypassing of bounds validation

Basic Information

ID CVE-2026-53171

Source Linux

Published Jun 25, 2026 at 08:38

Modified Jun 28, 2026 at 06:39

Affected Product

Vendor Linux

Product Linux

Version 5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b

Affected Versions Linux Linux 5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b
Linux Linux 5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b
Linux Linux 6.19

AI Assessment

AI Score 8.8 / 10

AI Severity High

Vendor The Linux Foundation

Product Linux Kernel

Version 6.19

References

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    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/ethosu: fix arithmetic issues in dma_length()\n\ndma_length() derives DMA region usage from command stream values and\nupdates region_size[]:\n\n    len = ((len + stride[0]) * size0 + stride[1]) * size1\n    region_size[region] = max(..., len + dma->offset)\n\nSeveral arithmetic issues can corrupt the derived region size:\n\n- signed stride values may underflow when added to len\n- intermediate multiplications may overflow\n- len + dma->offset may overflow during region_size updates\n- dma_length() error returns were not validated by the caller\n\nregion_size[] is later used by ethosu_job.c to validate command stream\naccesses against GEM buffer sizes. Arithmetic wraparound can therefore\nunder-report region usage and bypass the bounds validation.\n\nFix by validating signed additions, using overflow helpers for\nmultiplications and offset updates, and propagating dma_length()\nfailures to the caller.",
    "published": "2026-06-25T08:38:49.392Z",
    "modified": "2026-06-28T06:39:43.532Z",
    "type": "cve",
    "title": "accel/ethosu: fix arithmetic issues in dma_length()",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/6bb73845d1855ceaf50e397175e5979a7bdf69bc\nhttps://git.kernel.org/stable/c/ee6d9b6e51626f259c6f0e38d94f91be4fd14754",
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