batman-adv: bla: fix freeing of claims on meshif deletion
Published Sep 16, 2026
No CVSS score
EPSS 0.21%
Description
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.
Affected products
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- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
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- Version
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- Version 3.5StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<3.5
- Version 5.10.270StatusunaffectedConstraints<=5.10.*
- Version 5.15.221StatusunaffectedConstraints<=5.15.*
- Version 6.1.188StatusunaffectedConstraints<=6.1.*
- Version 6.12.110StatusunaffectedConstraints<=6.12.*
- Version 6.18.51StatusunaffectedConstraints<=6.18.*
- Version 6.6.157StatusunaffectedConstraints<=6.6.*
- Version 7.2.5StatusunaffectedConstraints<=7.2.*
- Version 7.3-rc1StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
No CWE recorded.
References (9)
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-80548 Advisory
- https://git.kernel.org/stable/c/76aedcde5a2489cc971d4d1e396e784a49565e96
- https://git.kernel.org/stable/c/844a95a734f178d56c7acce14c5cce2cecff7e1a
- https://git.kernel.org/stable/c/871acdf97f64cee8398f72b88b89e8b4f4816dbe
- https://git.kernel.org/stable/c/8d128c932bced74e3b1625ba3d7c78ef122a88a7
- https://git.kernel.org/stable/c/9a0c47023d3254048a1588534755d4476bcc3abc
- https://git.kernel.org/stable/c/aacffa780a37e06cd5a13d33740a6e96c3a67e6c
- https://git.kernel.org/stable/c/baeb1a28fd8e2f68193650d3664a8cd1adfd85c6
- https://git.kernel.org/stable/c/f50edb69082a8ba990cc23d642089829f99afe6a
Change history (0)
No recorded changes yet.