CVE-2026-89948
UnknownSummary
In the Linux kernel batman-adv module, when the mesh interface is deleted, batadv_bla_del_backbone_claims() is not executed because batadv_bla_free() sets claim_hash to NULL before the call, preventing all claims from being freed. Additionally, batadv_handle_unclaim() may fail to find the backbone due to missing rehashing handling. The fix simplifies the claim freeing process.
Risk Assessment
The vulnerability can lead to a memory leak (unfreed claim objects) when mesh interfaces are repeatedly created and deleted, potentially exhausting system resources over time. It affects systems using batman-adv with BLA.
Recommendation
Update the Linux kernel to a version containing the fix that properly frees claims on mesh interface deletion. Monitor memory usage in systems with dynamically created mesh interfaces.
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Original NVD description (English source)
In 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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS