CVE-2026-64095
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
In the Linux kernel's batman-adv (BLA) module, a vulnerability was found involving a double decrement of the bla.num_requests counter. The issue stems from non-atomic operations on the counter and the request_sent flag, leading to a race condition and incorrect state.
Risk Assessment
An attacker could exploit this vulnerability to exhaust the num_requests counter, potentially disrupting the Backbone Loop Avoidance (BLA) mechanism and causing communication issues in the mesh network.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit addressing the issue). Monitor for the patch availability for your distribution and apply it as soon as possible.
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Original NVD description (English source)
In 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.