batman-adv: bla: only purge non-released claims

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Summary

CVECVE-2026-46233
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 10:16:38 UTC
Updated2026-05-28 13:44:01 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: only purge non-released claims When batadv_bla_purge_claims() goes through the list of claims, it is only traversing the hash list with an rcu_read_lock(). Due to a potential parallel batadv_claim_put(), it can happen that it encounters a claim which was actually in the process of being released+freed by batadv_claim_release(). In this case, backbone_gw is set to NULL before the delayed RCU kfree is started. Calling batadv_bla_claim_get_backbone_gw() is then no longer allowed because it would cause a NULL-ptr derefence. To avoid this, only claims with a valid reference counter must be purged. All others are already taken care of.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 7b8fbcee3184d848b5aee085ca16d0cf05c9b641 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 b65365d2b1e6095c538d49baeb140dd1c166c1b3 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 cf6b604011591865ae39ac82de8978c1120d17af git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 6.6.140 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.90 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.32 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.9 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/ab3dbd07a809a8eb30c7ddfab9ac886ed30dce8d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7b8fbcee3184d848b5aee085ca16d0cf05c9b641 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b65365d2b1e6095c538d49baeb140dd1c166c1b3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7b7ebb7222a5524ce58e48cc9c6d688320ea6cfe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf6b604011591865ae39ac82de8978c1120d17af 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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