{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98442",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.349Z",
        "datePublished": "2026-10-18T15:14:52.614Z",
        "dateUpdated": "2026-10-21T12:55:03.600Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-21T12:55:03.600Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: fix helper UAF due to extensions realloc\n\nWhile calling the helpers, a raw pointer to the extensions area is\nwired into expectations list:\n\n  -> nf_ct_helper()\n   -> helper->help()\n    -> nf_ct_expect_related_report()\n     -> nf_ct_expect_insert()\n      -> hlist_add_head_rcu(&exp->lnode, &master_help->expectations)\n\nIn case the connection is not confirmed yet, more extensions can be\nadded afterwards with *_ext_add() calls reallocating the extension\nspace and leaving the now invalid pointer in the expectations list\nthat is later accessed while removing the expectation.\n\nMake sure that helpers are called at the end after all the other\nextensions are already added.\n\nNote that the helper rejection now leaves the mark and labels set,\nbut that's not different from how the NAT was handled before or how\nthe mark and the labels were handled on confirmation failure.  And\nthere are no atomicity guarantees provided by the API anyway."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/sched/act_ct.c"
                    ],
                    "versions": [
                        {
                            "version": "a21b06e7319129994f339ed47f512bbe57b77f5b",
                            "lessThan": "31f5fe29a572037ee19c233dfe506849940c484b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a21b06e7319129994f339ed47f512bbe57b77f5b",
                            "lessThan": "1679bbf5fbeac52a310b1a58b2b301bbf388bdbf",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a21b06e7319129994f339ed47f512bbe57b77f5b",
                            "lessThan": "812c16a255e7773a544e88b39ae6daed25544d30",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a21b06e7319129994f339ed47f512bbe57b77f5b",
                            "lessThan": "8988f4d11f3fba0ab38122178836c683ad516a05",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a21b06e7319129994f339ed47f512bbe57b77f5b",
                            "lessThan": "dad19b59da050cb60d3f7023dac2a042a84bf0bd",
                            "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/sched/act_ct.c"
                    ],
                    "versions": [
                        {
                            "version": "6.2",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.2",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.160",
                            "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": "6.2",
                                    "versionEndExcluding": "6.6.160"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.2",
                                    "versionEndExcluding": "6.12.112"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.2",
                                    "versionEndExcluding": "6.18.55"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.2",
                                    "versionEndExcluding": "7.2.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.2",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/31f5fe29a572037ee19c233dfe506849940c484b"
                },
                {
                    "url": "https://git.kernel.org/stable/c/1679bbf5fbeac52a310b1a58b2b301bbf388bdbf"
                },
                {
                    "url": "https://git.kernel.org/stable/c/812c16a255e7773a544e88b39ae6daed25544d30"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8988f4d11f3fba0ab38122178836c683ad516a05"
                },
                {
                    "url": "https://git.kernel.org/stable/c/dad19b59da050cb60d3f7023dac2a042a84bf0bd"
                }
            ],
            "title": "net/sched: act_ct: fix helper UAF due to extensions realloc",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}