{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-80845",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-26T14:34:25.797Z",
        "datePublished": "2026-09-04T15:54:55.489Z",
        "dateUpdated": "2026-10-19T08:44:39.455Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:44:39.455Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: avoid lock inversion in nat keepalive work\n\nnat_keepalive_work() walks the state table while xfrm_state_walk()\nholds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock,\nwhich conflicts with the delete path taking the same locks in reverse\norder via xfrm_state_delete() and __xfrm_state_delete(). This creates\nan AB-BA deadlock that is reported by lockdep when a NAT keepalive\nworker races with SA deletion.\n\nFix this by splitting the keepalive walk into two phases. First,\ncollect the candidate states while the walk holds xfrm_state_lock and\ntake a reference on each state. Then, after the walk completes, process\neach collected state and acquire x->lock without nesting it under\nxfrm_state_lock."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/xfrm/xfrm_nat_keepalive.c"
                    ],
                    "versions": [
                        {
                            "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
                            "lessThan": "ea09210462316e5235a25eccb11ad0708d86615e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
                            "lessThan": "5c86c895d1cac81a71ead3005084c6265cf6a7a5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
                            "lessThan": "89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
                            "lessThan": "a9fa05b7a1246797748d15771052639e0d3cabf1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae",
                            "lessThan": "763fe700b7c58ad64fe5202c5638848244dd4127",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/xfrm/xfrm_nat_keepalive.c"
                    ],
                    "versions": [
                        {
                            "version": "6.11",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.11",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.108",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.49",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.13",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.3",
                            "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": "6.11",
                                    "versionEndExcluding": "6.12.108"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "6.18.49"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "7.1.13"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "7.2.3"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.11",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e"
                },
                {
                    "url": "https://git.kernel.org/stable/c/5c86c895d1cac81a71ead3005084c6265cf6a7a5"
                },
                {
                    "url": "https://git.kernel.org/stable/c/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/a9fa05b7a1246797748d15771052639e0d3cabf1"
                },
                {
                    "url": "https://git.kernel.org/stable/c/763fe700b7c58ad64fe5202c5638848244dd4127"
                }
            ],
            "title": "xfrm: avoid lock inversion in nat keepalive work",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}