{"api_version":"1","generated_at":"2026-07-20T14:42:27+00:00","cve":"CVE-2026-64095","urls":{"html":"https://cve.report/CVE-2026-64095","api":"https://cve.report/api/cve/CVE-2026-64095.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64095","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64095"},"summary":{"title":"batman-adv: bla: avoid double decrement of bla.num_requests","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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:50","updated_at":"2026-07-19 16:17:50"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470","name":"https://git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3","name":"https://git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0","name":"https://git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c","name":"https://git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/83ab69bd12b80f6ea169c8bea6977701b53a043d","name":"https://git.kernel.org/stable/c/83ab69bd12b80f6ea169c8bea6977701b53a043d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705","name":"https://git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a9393751ecf7e9096f93cb6eed02db4f79125765","name":"https://git.kernel.org/stable/c/a9393751ecf7e9096f93cb6eed02db4f79125765","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8ff9c59d1b7b48c2596878341a5310f32895d52b","name":"https://git.kernel.org/stable/c/8ff9c59d1b7b48c2596878341a5310f32895d52b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64095","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64095","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 1f013bc94154f2e78e97d0296175664224c796e0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 5328b95960774f2e189f22485616bc7b8eb2f7e3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 8ff9c59d1b7b48c2596878341a5310f32895d52b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 a9393751ecf7e9096f93cb6eed02db4f79125765 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 461f1e3dfb888701895b766446c55db2b10db705 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 45384612f29692fbf0c770200361a7acff90125c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 65497ad155a3246df177b5ef662cd6e5a32cb470 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23721387c409087fd3b97e274f34d3ddc0970b74 83ab69bd12b80f6ea169c8bea6977701b53a043d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.10.259 5.10.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.210 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.176 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.143 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.93 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.34 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.11 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/bridge_loop_avoidance.c","net/batman-adv/mesh-interface.c","net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"1f013bc94154f2e78e97d0296175664224c796e0","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"5328b95960774f2e189f22485616bc7b8eb2f7e3","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"8ff9c59d1b7b48c2596878341a5310f32895d52b","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"a9393751ecf7e9096f93cb6eed02db4f79125765","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"461f1e3dfb888701895b766446c55db2b10db705","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"45384612f29692fbf0c770200361a7acff90125c","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"65497ad155a3246df177b5ef662cd6e5a32cb470","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"},{"lessThan":"83ab69bd12b80f6ea169c8bea6977701b53a043d","status":"affected","version":"23721387c409087fd3b97e274f34d3ddc0970b74","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/bridge_loop_avoidance.c","net/batman-adv/mesh-interface.c","net/batman-adv/types.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.5"},{"lessThan":"3.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.259","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.210","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.176","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.143","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.93","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.34","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.259","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.210","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"3.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"3.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-07-19T15:40:02.360Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/1f013bc94154f2e78e97d0296175664224c796e0"},{"url":"https://git.kernel.org/stable/c/5328b95960774f2e189f22485616bc7b8eb2f7e3"},{"url":"https://git.kernel.org/stable/c/8ff9c59d1b7b48c2596878341a5310f32895d52b"},{"url":"https://git.kernel.org/stable/c/a9393751ecf7e9096f93cb6eed02db4f79125765"},{"url":"https://git.kernel.org/stable/c/461f1e3dfb888701895b766446c55db2b10db705"},{"url":"https://git.kernel.org/stable/c/45384612f29692fbf0c770200361a7acff90125c"},{"url":"https://git.kernel.org/stable/c/65497ad155a3246df177b5ef662cd6e5a32cb470"},{"url":"https://git.kernel.org/stable/c/83ab69bd12b80f6ea169c8bea6977701b53a043d"}],"title":"batman-adv: bla: avoid double decrement of bla.num_requests","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64095","datePublished":"2026-07-19T15:40:02.360Z","dateReserved":"2026-07-19T07:54:57.033Z","dateUpdated":"2026-07-19T15:40:02.360Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:50","lastModifiedDate":"2026-07-19 16:17:50","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64095","Ordinal":"1","Title":"batman-adv: bla: avoid double decrement of bla.num_requests","CVE":"CVE-2026-64095","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64095","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"batman-adv: bla: avoid double decrement of bla.num_requests"}]}}}