{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43442",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:56.009Z",
        "datePublished": "2026-05-08T14:22:10.656Z",
        "dateUpdated": "2026-08-05T12:27:59.003Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:27:59.003Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops\n\nWhen IORING_SETUP_SQE_MIXED is used without IORING_SETUP_NO_SQARRAY,\nthe boundary check for 128-byte SQE operations in io_init_req()\nvalidated the logical SQ head position rather than the physical SQE\nindex.\n\nThe existing check:\n\n  !(ctx->cached_sq_head & (ctx->sq_entries - 1))\n\nensures the logical position isn't at the end of the ring, which is\ncorrect for NO_SQARRAY rings where physical == logical. However, when\nsq_array is present, an unprivileged user can remap any logical\nposition to an arbitrary physical index via sq_array. Setting\nsq_array[N] = sq_entries - 1 places a 128-byte operation at the last\nphysical SQE slot, causing the 128-byte memcpy in\nio_uring_cmd_sqe_copy() to read 64 bytes past the end of the SQE\narray.\n\nReplace the cached_sq_head alignment check with a direct validation\nof the physical SQE index, which correctly handles both sq_array and\nNO_SQARRAY cases."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                        "baseScore": 7.1,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable path is reached through local io_uring syscalls and userspace-controlled SQ/SQE mappings, not by remote packets or physical access.\nAC:L - The attacker controls ring setup flags, sq_array contents, SQEs, and submission order; no race or external timing condition is required.\nPR:L - A basic unprivileged local user can create io_uring instances on the default kernel.io_uring_disabled=0 configuration and can use accessible uring_cmd files such as /dev/null or sockets.\nUI:N - Exploitation only requires the attacker's own syscall sequence and mapped ring manipulation, with no victim action.\nS:U - The issue remains within the kernel security authority and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - The bad 128-byte memcpy can read 64 bytes past the SQE array; for page-boundary layouts this can read adjacent kernel memory, so confidentiality impact is high.\nI:N - The investigated primitive is an out-of-bounds read into a valid request buffer, with no out-of-bounds write or direct arbitrary modification primitive identified.\nA:H - The same out-of-bounds read can fault or trigger kernel diagnostics/oops conditions and is repeatable by the local attacker."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/io_uring.c"
                    ],
                    "versions": [
                        {
                            "version": "1cba30bf9fdd6c982708f3587f609a30c370d889",
                            "lessThan": "1f794f9bed3e5cf7250a3b4daf112a72ed1513e9",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "1cba30bf9fdd6c982708f3587f609a30c370d889",
                            "lessThan": "6f02c6b196036dbb6defb4647d8707d29b7fe95b",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "io_uring/io_uring.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.9",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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": "6.19.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/1f794f9bed3e5cf7250a3b4daf112a72ed1513e9"
                },
                {
                    "url": "https://git.kernel.org/stable/c/6f02c6b196036dbb6defb4647d8707d29b7fe95b"
                }
            ],
            "title": "io_uring: fix physical SQE bounds check for SQE_MIXED 128-byte ops",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}