{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-89948",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-11T19:38:34.777Z",
        "datePublished": "2026-09-16T10:32:34.089Z",
        "dateUpdated": "2026-10-19T08:55:22.451Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-19T08:55:22.451Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: fix freeing of claims on meshif deletion\n\nWhen the mesh interface is getting deleted, then\nbatadv_bla_del_backbone_claims() (via batadv_bla_purge_backbone_gw()) could\nmake sure that all claims gets removed. But this function is only executed\nwhen bat_priv->bla.claim_hash is not NULL. And since batadv_bla_free() is\nalways setting it to NULL before it is (indirectly) called, it was never\nactually executed.\n\nBut the batadv_bla_purge_claims() -> batadv_handle_unclaim() is at the\nmoment too fragile because the BLA code is not handling the rehashing in\nbatadv_bla_update_orig_address(). The stored backbone address doesn't have\nto be the one actually used for the hash bucket selection during the\ninitial adding of the backbone. The batadv_handle_unclaim() can therefore\nfail to find the respective backbone for the unclaim and then stop the\ndeletion.\n\nBut the actual backbone_gw object is not needed for the unclaim because all\nrelevant information is always provided by the caller. And the check for\nthe existence of the backbone_gw doesn't provide any additional security\ncheck for the deletion of a claim."
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/batman-adv/bridge_loop_avoidance.c"
                    ],
                    "versions": [
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "844a95a734f178d56c7acce14c5cce2cecff7e1a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "baeb1a28fd8e2f68193650d3664a8cd1adfd85c6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "aacffa780a37e06cd5a13d33740a6e96c3a67e6c",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "76aedcde5a2489cc971d4d1e396e784a49565e96",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "f50edb69082a8ba990cc23d642089829f99afe6a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "871acdf97f64cee8398f72b88b89e8b4f4816dbe",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "9a0c47023d3254048a1588534755d4476bcc3abc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "23721387c409087fd3b97e274f34d3ddc0970b74",
                            "lessThan": "8d128c932bced74e3b1625ba3d7c78ef122a88a7",
                            "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/batman-adv/bridge_loop_avoidance.c"
                    ],
                    "versions": [
                        {
                            "version": "3.5",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.5",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.270",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.51",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.5",
                            "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": "3.5",
                                    "versionEndExcluding": "5.10.270"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "5.15.221"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "6.1.188"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "6.6.157"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "6.12.110"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
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                                },
                                {
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                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "7.2.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "3.5",
                                    "versionEndExcluding": "7.3"
                                }
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                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6"
                },
                {
                    "url": "https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c"
                },
                {
                    "url": "https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96"
                },
                {
                    "url": "https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a"
                },
                {
                    "url": "https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe"
                },
                {
                    "url": "https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc"
                },
                {
                    "url": "https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7"
                }
            ],
            "title": "batman-adv: bla: fix freeing of claims on meshif deletion",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}