{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53172",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-06-09T07:44:35.389Z",
        "datePublished": "2026-06-25T08:38:50.056Z",
        "dateUpdated": "2026-08-05T12:33:41.473Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:33:41.473Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/ethosu: fix IFM region index out-of-bounds in command stream parser\n\nNPU_SET_IFM_REGION extracts the region index with param & 0x7f, giving\na maximum value of 127. However region_size[] and output_region[] in\nstruct ethosu_validated_cmdstream_info are both sized to\nNPU_BASEP_REGION_MAX (8), giving valid indices [0..7].\n\nEvery other region assignment in the same switch uses param & 0x7:\n  NPU_SET_OFM_REGION:  st.ofm.region  = param & 0x7;\n  NPU_SET_IFM2_REGION: st.ifm2.region = param & 0x7;\n  NPU_SET_WEIGHT_REGION: st.weight[0].region = param & 0x7;\n  NPU_SET_SCALE_REGION:  st.scale[0].region  = param & 0x7;\n\nThe 0x7f mask on IFM is inconsistent and appears to be a typo.\n\nfeat_matrix_length() and calc_sizes() use the region index directly\nas an array subscript into the kzalloc'd info struct:\n  info->region_size[fm->region] = max(...);\n\nA userspace caller supplying NPU_SET_IFM_REGION with param > 7 causes\na write up to 127*8 = 1016 bytes past the start of region_size[],\ncorrupting adjacent kernel heap data.\n\nFix by applying the same & 0x7 mask used by all other region\nassignments."
                }
            ],
            "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 parser is reached through the local DRM accel ioctl DRM_IOCTL_ETHOSU_CMDSTREAM_BO_CREATE on /dev/accel/accel*, with the command stream supplied from a userspace pointer.\nAC:L - A crafted command stream can directly set an IFM region index above 7 and then trigger size calculation; no race or condition outside attacker control is required.\nPR:L - The attacker needs local access to the Ethos-U accel device node as an unprivileged userspace client, but the ioctl has no CAP_SYS_ADMIN, DRM_MASTER, or DRM_AUTH gate.\nUI:N - No victim action is required beyond the attacker issuing the ioctl with a malformed command stream.\nS:U - The bug is standard kernel heap memory corruption reachable from a local kernel device interface and does not cross a VM, IOMMU, or separate security authority boundary.\nC:H - The out-of-bounds region_size access performs an 8-byte heap read during max() and memory corruption can plausibly be leveraged for kernel information disclosure.\nI:H - The bug performs an out-of-bounds 8-byte heap write up to roughly 1KB beyond the allocated validation info object with attacker-influenced command stream values.\nA:H - The same out-of-bounds heap corruption can readily crash or destabilize the kernel, and repeated local triggering is straightforward."
                        }
                    ]
                }
            ],
            "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": "ee7bed779def61ebff1b92b0e851f412176fa416",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
                            "lessThan": "00f547e0dfecf83014fb32bcba587c6b684c1362",
                            "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/ee7bed779def61ebff1b92b0e851f412176fa416"
                },
                {
                    "url": "https://git.kernel.org/stable/c/00f547e0dfecf83014fb32bcba587c6b684c1362"
                }
            ],
            "title": "accel/ethosu: fix IFM region index out-of-bounds in command stream parser",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}