{"id":"CVE-2026-89948","published":"2026-09-16T11:17:04.890","lastModified":"2026-09-16T11:17:04.890","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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96","tags":[]},{"url":"https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a","tags":[]},{"url":"https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe","tags":[]},{"url":"https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7","tags":[]},{"url":"https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc","tags":[]},{"url":"https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c","tags":[]},{"url":"https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6","tags":[]},{"url":"https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}