{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53171",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.389Z",
        "datePublished": "2026-06-25T08:38:49.392Z",
        "dateUpdated": "2026-08-05T12:33:40.393Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:33:40.393Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable path is reached through local DRM accel ioctls on the Ethos-U device, via user-supplied command stream creation and job submission.\nAC:L - The attacker controls the command stream fields that trigger the arithmetic wraparound, and no race or external state is required beyond access to an affected Ethos-U device.\nPR:L - No kernel capability check is present on the relevant driver ioctls, but exploitation requires a local unprivileged process able to open the accel device node.\nUI:N - After local device access, the attacker can create buffers and submit the malicious command stream directly without victim interaction.\nS:C - The validation bypass can let NPU DMA access memory outside the intended GEM buffer, crossing the intended DMA/object isolation boundary and potentially affecting kernel or other-process memory.\nC:H - An out-of-bounds DMA source can copy memory outside the attacker’s buffer into an attacker-readable destination buffer, giving a plausible high-impact memory disclosure primitive.\nI:H - An out-of-bounds DMA destination can write outside the validated GEM buffer, giving a plausible high-impact memory corruption primitive.\nA:H - Out-of-bounds DMA can corrupt system memory or trigger bus/device faults and scheduler resets, with a plausible kernel crash or system-level denial of service."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/accel/ethosu/ethosu_gem.c"
                    ],
                    "versions": [
                        {
                            "version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
                            "lessThan": "6bb73845d1855ceaf50e397175e5979a7bdf69bc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
                            "lessThan": "ee6d9b6e51626f259c6f0e38d94f91be4fd14754",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/accel/ethosu/ethosu_gem.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.13",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.0.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.1"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/6bb73845d1855ceaf50e397175e5979a7bdf69bc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ee6d9b6e51626f259c6f0e38d94f91be4fd14754"
                }
            ],
            "title": "accel/ethosu: fix arithmetic issues in dma_length()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}