Linux kernel batman-adv: prevent use-after-free on claim deletion
CVE-2026-46212 Published on May 28, 2026
batman-adv: bla: prevent use-after-free when deleting claims
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: bla: prevent use-after-free when deleting claims
When batadv_bla_del_backbone_claims() removes all claims for a backbone, it
does this by dropping the link entry in the hash list. This list entry
itself was one of the references which need to be dropped at the same time
via batadv_claim_put().
But the batadv_claim_put() must not be done before the last access to the
claim object in this function. Otherwise the claim might be freed already
by the batadv_claim_release() function before the list entry was dropped.
Products Associated with CVE-2026-46212
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Affected Versions
Linux:- Version 23721387c409087fd3b97e274f34d3ddc0970b74 and below 368449e467d5f1e2c2e987bf2bd57000ba75e10b is affected.
- Version 23721387c409087fd3b97e274f34d3ddc0970b74 and below 6c5dc6d68e6ba7f0224a757a39ed52fcdb54d472 is affected.
- Version 23721387c409087fd3b97e274f34d3ddc0970b74 and below 00155f336a5e8b1006d2ca9ae7ad8fc4a44bb401 is affected.
- Version 23721387c409087fd3b97e274f34d3ddc0970b74 and below 0cc9847c64cb6e61118bc78c9187c8209a7197fa is affected.
- Version 23721387c409087fd3b97e274f34d3ddc0970b74 and below 4ae1709a314060a196981b344610d023ea841e57 is affected.
- Version 3.5 is affected.
- Before 3.5 is unaffected.
- Version 6.6.140, <= 6.6.* is unaffected.
- Version 6.12.90, <= 6.12.* is unaffected.
- Version 6.18.32, <= 6.18.* is unaffected.
- Version 7.0.9, <= 7.0.* is unaffected.
- Version 7.1-rc4, <= * is unaffected.