{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53173",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.389Z",
        "datePublished": "2026-06-25T08:38:50.709Z",
        "dateUpdated": "2026-08-05T12:33:42.554Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:33:42.554Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/ethosu: fix OOB write in ethosu_gem_cmdstream_copy_and_validate()\n\nThe command stream parsing loop increments the index variable a second\ntime when a 64-bit command word is encountered (bit 14 set), but does\nnot re-check the loop bound before writing the second word:\n\n    for (i = 0; i < size / 4; i++) {\n        bocmds[i] = cmds[0];\n        if (cmd & 0x4000) {\n            i++;\n            bocmds[i] = cmds[1];   /* unchecked */\n        }\n    }\n\nThe buffer bocmds is backed by a DMA allocation of exactly size bytes\nfrom drm_gem_dma_create(ddev, size), giving valid indices [0, size/4-1].\n\nWhen i == size/4 - 1 on entry to an iteration and bit 14 of cmds[0] is\nset, bocmds[size/4-1] is written in bounds, i is then incremented to\nsize/4, and bocmds[size/4] writes four bytes past the end of the\nallocation.\n\nUserspace controls both the buffer contents and the size argument via\nthe ioctl, making this a userspace-triggerable heap out-of-bounds write.\n\nFix by checking the incremented index against the buffer bound before\nthe second write and returning -EINVAL if the buffer is too small to\ncontain the extended command."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable code is reached through the local DRM accel ioctl `DRM_IOCTL_ETHOSU_CMDSTREAM_BO_CREATE` on `/dev/accel/accel*`, not through network, adjacent, or physical input.\nAC:L - Userspace controls both the command stream contents and size, and can deterministically place a 64-bit command marker at the final word to trigger the unchecked second write. No race or external state is required.\nPR:L - The driver ioctl has no capability, root, master, or authentication check, but the attacker must be a local user/process able to open the accelerator device node.\nUI:N - No victim action is needed after the attacker has local device access; a single ioctl with attacker-controlled arguments reaches the vulnerable function.\nS:U - This is kernel memory corruption within the same host security authority and does not cross a VM, IOMMU, or other distinct security boundary.\nC:H - The bug is a userspace-triggered kernel heap/DMA allocation out-of-bounds write, which is defensibly exploitable as memory corruption and can lead to kernel compromise and disclosure of arbitrary kernel data.\nI:H - An out-of-bounds write of attacker-controlled command data past a kernel DMA-backed GEM allocation can corrupt adjacent memory and is treated as high-integrity-impact kernel memory corruption.\nA:H - Even without full exploitation, corrupting memory past the allocation can crash or destabilize the kernel, giving 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": "db6cb3e35cebf487f9a78ebd4cfa4b83708ff40d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
                            "lessThan": "c0837b9cf6eabbad8b8cbddaff1a46a6d0a2e29d",
                            "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/db6cb3e35cebf487f9a78ebd4cfa4b83708ff40d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/c0837b9cf6eabbad8b8cbddaff1a46a6d0a2e29d"
                }
            ],
            "title": "accel/ethosu: fix OOB write in ethosu_gem_cmdstream_copy_and_validate()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}