{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98491",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.353Z",
        "datePublished": "2026-10-18T15:16:20.069Z",
        "dateUpdated": "2026-10-19T09:20:28.394Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T09:20:28.394Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry\n\nIn a case where skb with an unconfirmed ct entry gets cloned, we may\nend up committing both but with different sets of extensions.\n\nThe series of events:\n\n 1. The first clone wants to commit and runs the helpers wiring up\n    the extension pointer into the expectation list.\n 2. Then it looses the confirmation keeping the entry unconfirmed.\n 3. Second clone now wants to commit labels and adds the new extension\n    for that breaking the pointer in the expectation list causing\n    UAF on the destruction path later.\n\nWhile this is possible to trigger, there should be no practical\nnetwork pipeline where committing both clones without modifications\ninto the same zone is needed.  So, let's just reset the entry in case\nfor some reason we got an skb with a shared one during commit.  This\ndoesn't affect any known use cases, but avoids any potential problems\nwith sharing and modification of the unconfirmed ct entry.\n\nThe fixes tag points to the introduction of helpers, since that's the\nmain UAF trigger for the sharing."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/net/netfilter/nf_conntrack.h",
                        "net/openvswitch/conntrack.c"
                    ],
                    "versions": [
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "37e3c878b183a115f9a114067f9ef3b408ad27fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "707c2dc77891a874f4e8c52c285a511079164ec8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "de41ee24f77b0fc45397db3e277cae2adbd43dfe",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "55e5256adf3940e71802e2f749cacf81518726b0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "e2829ae5459ddb5fce526b2e84697edf6c0c3cef",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "cae3a2627520c3795b54533c5328b77af3405dbe",
                            "lessThan": "26b2bd70d22457556e2fa01cbf1192cb1a94d619",
                            "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/net/netfilter/nf_conntrack.h",
                        "net/openvswitch/conntrack.c"
                    ],
                    "versions": [
                        {
                            "version": "4.3",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.3",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.271",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.222",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.189",
                            "lessThanOrEqual": "6.1.*",
                            "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": "4.3",
                                    "versionEndExcluding": "5.10.271"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "5.15.222"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "6.1.189"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "6.6.158"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "6.12.112"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "6.18.55"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "7.2.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "4.3",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/e0fa5ea434b7e8467ef3adc64e3858b1ca2a642d"
                },
                {
                    "url": "https://git.kernel.org/stable/c/37e3c878b183a115f9a114067f9ef3b408ad27fb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/707c2dc77891a874f4e8c52c285a511079164ec8"
                },
                {
                    "url": "https://git.kernel.org/stable/c/de41ee24f77b0fc45397db3e277cae2adbd43dfe"
                },
                {
                    "url": "https://git.kernel.org/stable/c/55e5256adf3940e71802e2f749cacf81518726b0"
                },
                {
                    "url": "https://git.kernel.org/stable/c/e2829ae5459ddb5fce526b2e84697edf6c0c3cef"
                },
                {
                    "url": "https://git.kernel.org/stable/c/457e0df1b5711fbeb7ba1b6bfd826f5ef30e7e55"
                },
                {
                    "url": "https://git.kernel.org/stable/c/26b2bd70d22457556e2fa01cbf1192cb1a94d619"
                }
            ],
            "title": "net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}