{"id":"CVE-2026-89948","title":"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_backb…","summary":"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_backb…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 844a95a734f178d56c7acce14c5cce2cecff7e1a","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < baeb1a28fd8e2f68193650d3664a8cd1adfd85c6","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < aacffa780a37e06cd5a13d33740a6e96c3a67e6c","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 76aedcde5a2489cc971d4d1e396e784a49565e96","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < f50edb69082a8ba990cc23d642089829f99afe6a","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 871acdf97f64cee8398f72b88b89e8b4f4816dbe","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 9a0c47023d3254048a1588534755d4476bcc3abc","Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 8d128c932bced74e3b1625ba3d7c78ef122a88a7","Linux 3.5"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T11:17:04.890","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89948","references":[{"url":"https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.963Z","epss":0.00211,"epssPercentile":0.1159,"slug":"CVE-2026-89948","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}