{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53170",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.389Z",
        "datePublished": "2026-06-25T08:38:48.728Z",
        "dateUpdated": "2026-08-05T12:33:39.324Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:33:39.324Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/ethosu: reject DMA commands with uninitialized length\n\ncmd_state_init() initializes the command state with memset(0xff),\nleaving dma->len at U64_MAX to signal missing setup. The only setter\nis NPU_SET_DMA0_LEN; if userspace omits this command and issues\nNPU_OP_DMA_START, dma->len remains U64_MAX.\n\nIn dma_length(), a positive stride added to U64_MAX wraps to a small\nvalue. With size0 == 1, check_mul_overflow() does not trigger and\ndma_length() returns 0 instead of U64_MAX. The caller's U64_MAX check\nthen passes, region_size[] stays 0, and the bounds check in\nethosu_job.c is bypassed, allowing hardware to execute DMA with stale\nphysical addresses.\n\nFix by checking for U64_MAX at the start of dma_length() before any\narithmetic, consistent with the sentinel value used throughout the\ndriver to detect uninitialized fields."
                }
            ],
            "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 device ioctls for Ethos-U command stream creation and job submission. There is no network, adjacent, or physical packet/device insertion path to this parser.\nAC:L - The attacker controls the userspace command stream, can omit NPU_SET_DMA0_LEN, set the DMA mode/stride/size values needed for wraparound, and can prime stale base registers with prior jobs. No race or condition outside the attacker’s control is required.\nPR:L - The Ethos-U ioctls are registered without DRM_ROOT_ONLY, DRM_AUTH, or DRM_MASTER checks, so no kernel capability or administrator privilege is required. Exploitation requires a local low-privileged user able to open the accel device node.\nUI:N - Once the local attacker can issue the ioctls, the command stream validation bypass and hardware job execution occur without any victim action. No user needs to open a file, mount anything, or approve the job.\nS:C - The bug lets a userspace client drive an external DMA-capable NPU using stale DMA addresses outside the per-job GEM/DMA isolation the driver is supposed to enforce. This is a DMA boundary bypass, so impact can extend beyond the vulnerable parser’s normal security authority.\nC:H - A malicious DMA command can use a stale source base address and copy data from another or freed DMA mapping into attacker-controlled memory. In the highest reasonable embedded deployment, stale physical DMA access can expose sensitive kernel or cross-process memory.\nI:H - A malicious DMA command can use a stale destination base address and write attacker-controlled data outside the authorized GEM buffer. This can corrupt other DMA buffers or reused kernel memory and is defensibly an arbitrary memory modification primitive.\nA:H - Invalid or malicious DMA can trigger NPU bus faults, scheduler resets, hangs, or broader kernel memory corruption. Repeated local submission can therefore cause high availability impact."
                        }
                    ]
                }
            ],
            "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": "fb25c76a820ca8a547aa478bfb503da0a11494ab",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
                            "lessThan": "d9d021218162b6c4fe0bdf42b2b340f1aae23a12",
                            "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/fb25c76a820ca8a547aa478bfb503da0a11494ab"
                },
                {
                    "url": "https://git.kernel.org/stable/c/d9d021218162b6c4fe0bdf42b2b340f1aae23a12"
                }
            ],
            "title": "accel/ethosu: reject DMA commands with uninitialized length",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}