{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98591",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.359Z",
        "datePublished": "2026-10-18T15:19:03.567Z",
        "dateUpdated": "2026-10-19T09:22:16.758Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:22:16.758Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix bounds check for skb-backed dynptrs\n\nThe skb_pointer_if_linear() function checks whether a\nmemory region of length len starting at offset off into\nthe skb is in the linear area, and returns a pointer to\nthe region if so. The check currently subtracts between\nskb_headlen and offset of the check, and since skb_headlen\nis unsigned the subtraction can underflow. This causes the\nbounds check to spuriously pass and generate an arbitrary\npointer of the form *(skb->data + off).\n\nThe only user of this helper is currently skb-backed BPF\ndynptr code. Returning the wrong pointer leads to the\ndynptr erroneously being backed with invalid memory.\n\nEnsure the subtraction cannot underflow, and fail the check if\nit would. Use u64 arithmetic to also prevent overflow when\ncalculating (skb_headlen(skb) - off) since off is unsigned."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/skbuff.h"
                    ],
                    "versions": [
                        {
                            "version": "6f5a630d7c57cd79b1f526a95e757311e32d41e5",
                            "lessThan": "1b923538598be768e9f2f258a77a083d00e0c78b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6f5a630d7c57cd79b1f526a95e757311e32d41e5",
                            "lessThan": "37877a24758068742fef687a7cf5362360dde1d1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6f5a630d7c57cd79b1f526a95e757311e32d41e5",
                            "lessThan": "1196903a27cac5c929c7517e987a8d159f20c5e5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6f5a630d7c57cd79b1f526a95e757311e32d41e5",
                            "lessThan": "39ffceaddb10753eac12785dba6ac0673860b4ac",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "6f5a630d7c57cd79b1f526a95e757311e32d41e5",
                            "lessThan": "ed6eec97b534979dcf28b40c389cee57bd6561d4",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/skbuff.h"
                    ],
                    "versions": [
                        {
                            "version": "6.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.158",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.112",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.55",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.9",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "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": "6.6",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.12.112"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "6.18.55"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "7.2.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.6",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/1b923538598be768e9f2f258a77a083d00e0c78b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/37877a24758068742fef687a7cf5362360dde1d1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1196903a27cac5c929c7517e987a8d159f20c5e5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/39ffceaddb10753eac12785dba6ac0673860b4ac"
                },
                {
                    "url": "https://git.kernel.org/stable/c/ed6eec97b534979dcf28b40c389cee57bd6561d4"
                }
            ],
            "title": "bpf: Fix bounds check for skb-backed dynptrs",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}