{"api_version":"1","generated_at":"2026-09-17T23:44:39+00:00","cve":"CVE-2026-89948","urls":{"html":"https://cve.report/CVE-2026-89948","api":"https://cve.report/api/cve/CVE-2026-89948.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89948","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89948"},"summary":{"title":"batman-adv: bla: fix freeing of claims on meshif deletion","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:17:04","updated_at":"2026-09-16 11:17:04"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc","name":"https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6","name":"https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7","name":"https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a","name":"https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe","name":"https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a","name":"https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c","name":"https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96","name":"https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89948","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89948","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 844a95a734f178d56c7acce14c5cce2cecff7e1a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 baeb1a28fd8e2f68193650d3664a8cd1adfd85c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 aacffa780a37e06cd5a13d33740a6e96c3a67e6c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 76aedcde5a2489cc971d4d1e396e784a49565e96 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/bridge_loop_avoidance.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"844a95a734f178d56c7acce14c5cce2cecff7e1a","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"baeb1a28fd8e2f68193650d3664a8cd1adfd85c6","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"aacffa780a37e06cd5a13d33740a6e96c3a67e6c","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"76aedcde5a2489cc971d4d1e396e784a49565e96","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"f50edb69082a8ba990cc23d642089829f99afe6a","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"871acdf97f64cee8398f72b88b89e8b4f4816dbe","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"9a0c47023d3254048a1588534755d4476bcc3abc","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"8d128c932bced74e3b1625ba3d7c78ef122a88a7","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/bridge_loop_avoidance.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.270","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"3.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-09-16T10:32:34.089Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89948","datePublished":"2026-09-16T10:32:34.089Z","dateReserved":"2026-09-11T19:38:34.777Z","dateUpdated":"2026-09-16T10:32:34.089Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:17:04","lastModifiedDate":"2026-09-16 11:17:04","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89948","Ordinal":"1","Title":"batman-adv: bla: fix freeing of claims on meshif deletion","CVE":"CVE-2026-89948","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89948","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"batman-adv: bla: fix freeing of claims on meshif deletion"}]}}}