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A vulnerability in the Linux kernel's batman-adv subsystem related to improper atomic handling of the bla.num_requests counter has been resolved. The issue involves a race condition where concurrent operations on request_sent state and bla.num_requests counter are not properly synchronized, potentially leading to a double decrement of bla.num_requests. This flaw could cause instability or denial of service in the affected subsystem. The vulnerability has been assigned CVE-2026-64095 and is rated with a CVSS score of 7.1 (medium severity). A patch is available and included in Linux kernel updates for various Ubuntu releases.

CVE-2026-64095 addresses a concurrency flaw in the Linux kernel's batman-adv mesh networking subsystem. The vulnerability arises because the bla.num_requests counter and the request_sent state are modified without proper locking, leading to a time-of-check to time-of-use (TOCTOU) race condition. Specifically, batadv_bla_send_request() may set request_sent to 1 and be interrupted, allowing batadv_handle_announce() to reset request_sent to 0 and decrement bla.num_requests before the increment occurs. This can cause a double decrement of bla.num_requests, potentially destabilizing the subsystem. The fix involves introducing locking to ensure atomic modification of request_sent and bla.num_requests, and simplifying related state variables accordingly. The issue affects multiple Ubuntu kernel versions prior to 7.0.0-28.28~24.04.1 and similar versions, with patches released as part of Ubuntu security notices USN-8593-1 and USN-8603-1.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The b

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The bla.num_requests… (CVE-2026-64095) - Live Threat Intelligence - Threat Radar | OffSeq.com

In the Linux kernel, the following vulnerability has been resolved: batman-adv: bla: avoid double decrement of bla.num_requests The bla.num_requests… (CVE-2026-64095)

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