{"cve":"CVE-2026-64095","nvd":{"published":"2026-07-19T16:17:50.470","modified":"2026-08-11T16:11:27.663","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: avoid double decrement of bla.num_requests\n\nThe bla.num_requests is increased when no request_sent was in progress. And\nit is decremented in various places (announcement was received, backbone is\npurged, periodic work). But the check if the request_sent is actually set\nto a specific state and the atomic_dec/_inc are not safe because they are\nnot atomic (TOCTOU) and multiple such code portions can run concurrently.\n\nAt the same time, it is necessary to modify request_sent (state) and\nbla.num_requests atomically. Otherwise batadv_bla_send_request() might set\nrequest_sent to 1 and is interrupted.  batadv_handle_announce() can then\nset request_sent back to 0 and decrement num_requests before\nbatadv_bla_send_request() incremented it.\n\nThe two operations must therefore be locked. And since state (request_sent)\nand wait_periods are only accessed inside this lock, they can be converted\nto simpler datatypes. And to avoid that the bla.num_requests is touched by\na parallel running context with a valid backbone_gw reference after\nbatadv_bla_purge_backbone_gw() ran, a third state \"stopped\" is required to\ncorrectly signal that a backbone_gw is in the state of being cleaned up.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","score":7.1},"cwes":[],"references":["https://git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0","https://git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c","https://git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705","https://git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3","https://git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:45:36.895656543+00:00"},"epss":{"cve":"CVE-2026-64095","score":0.00267,"percentile":0.189,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}