batman-adv: bla: fix freeing of claims on meshif deletion

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89948
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:04 UTC
Updated2026-09-16 11:17:04 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: fix freeing of claims on meshif deletion When the mesh interface is getting deleted, then batadv_bla_del_backbone_claims() (via batadv_bla_purge_backbone_gw()) could make sure that all claims gets removed. But this function is only executed when bat_priv->bla.claim_hash is not NULL. And since batadv_bla_free() is always setting it to NULL before it is (indirectly) called, it was never actually executed. But the batadv_bla_purge_claims() -> batadv_handle_unclaim() is at the moment too fragile because the BLA code is not handling the rehashing in batadv_bla_update_orig_address(). The stored backbone address doesn't have to be the one actually used for the hash bucket selection during the initial adding of the backbone. The batadv_handle_unclaim() can therefore fail to find the respective backbone for the unclaim and then stop the deletion. But the actual backbone_gw object is not needed for the unclaim because all relevant information is always provided by the caller. And the check for the existence of the backbone_gw doesn't provide any additional security check for the deletion of a claim.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 844a95a734f178d56c7acce14c5cce2cecff7e1a git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 baeb1a28fd8e2f68193650d3664a8cd1adfd85c6 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 aacffa780a37e06cd5a13d33740a6e96c3a67e6c git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 76aedcde5a2489cc971d4d1e396e784a49565e96 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 f50edb69082a8ba990cc23d642089829f99afe6a git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 871acdf97f64cee8398f72b88b89e8b4f4816dbe git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 9a0c47023d3254048a1588534755d4476bcc3abc git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 8d128c932bced74e3b1625ba3d7c78ef122a88a7 git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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