batman-adv: bla: avoid double decrement of bla.num_requests

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Summary

CVECVE-2026-64095
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:50 UTC
Updated2026-07-19 16:17:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The bla.num_requests is increased when no request_sent was in progress. And it is decremented in various places (announcement was received, backbone is purged, periodic work). But the check if the request_sent is actually set to a specific state and the atomic_dec/_inc are not safe because they are not atomic (TOCTOU) and multiple such code portions can run concurrently. At the same time, it is necessary to modify request_sent (state) and bla.num_requests atomically. Otherwise batadv_bla_send_request() might set request_sent to 1 and is interrupted. batadv_handle_announce() can then set request_sent back to 0 and decrement num_requests before batadv_bla_send_request() incremented it. The two operations must therefore be locked. And since state (request_sent) and wait_periods are only accessed inside this lock, they can be converted to simpler datatypes. And to avoid that the bla.num_requests is touched by a parallel running context with a valid backbone_gw reference after batadv_bla_purge_backbone_gw() ran, a third state "stopped" is required to correctly signal that a backbone_gw is in the state of being cleaned up.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 1f013bc94154f2e78e97d0296175664224c796e0 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 5328b95960774f2e189f22485616bc7b8eb2f7e3 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 8ff9c59d1b7b48c2596878341a5310f32895d52b git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 a9393751ecf7e9096f93cb6eed02db4f79125765 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 461f1e3dfb888701895b766446c55db2b10db705 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 45384612f29692fbf0c770200361a7acff90125c git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 65497ad155a3246df177b5ef662cd6e5a32cb470 git Not specified
CNA Linux Linux affected 23721387c409087fd3b97e274f34d3ddc0970b74 83ab69bd12b80f6ea169c8bea6977701b53a043d git Not specified
CNA Linux Linux affected 3.5 Not specified
CNA Linux Linux unaffected 3.5 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.93 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/83ab69bd12b80f6ea169c8bea6977701b53a043d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a9393751ecf7e9096f93cb6eed02db4f79125765 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8ff9c59d1b7b48c2596878341a5310f32895d52b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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