{"api_version":"1","generated_at":"2026-07-23T12:59:07+00:00","cve":"CVE-2026-64093","urls":{"html":"https://cve.report/CVE-2026-64093","api":"https://cve.report/api/cve/CVE-2026-64093.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64093","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64093"},"summary":{"title":"batman-adv: tp_meter: directly shut down timer on cleanup","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: directly shut down timer on cleanup\n\nbatadv_tp_sender_cleanup() was calling timer_delete_sync() followed by\ntimer_delete() to guard against the timer handler re-arming itself between\nthe two calls. This double-deletion hack relied on the sending status being\nset to 0 to suppress re-arming.\n\nReplace both calls with a single timer_shutdown_sync(). This function both\nwaits for any running timer callback to complete (like timer_delete_sync())\nand permanently disarms the timer so it cannot be re-armed afterwards,\nmaking re-arming prevention unconditional and self-documenting.\n\nThe re-arming property is also required because otherwise:\n\n1. context 0 (batadv_tp_recv_ack()) checks in\n   batadv_tp_reset_sender_timer() if sending is still 1 -> it is\n2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in\n   this process forces the kthread to stop timer in\n   batadv_tp_sender_cleanup()\n3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the\n   timer -> but the reference for it is already gone","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:50","updated_at":"2026-07-20 15:17:08"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a","name":"https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff","name":"https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c","name":"https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a","name":"https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43","name":"https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991","name":"https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e","name":"https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64093","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64093","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 74a76634055462833446684fd526d73c290ea43a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e 5bc2d50fb66b46f86543d5153a188eb1486d0b6e git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 33a3bb4a3345bb511f9c69c913da95d4693e2a4e f86b20ec8d17d77bddc02c5c86cfa2389d84ecff git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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00:13:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/tp_meter.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"74a76634055462833446684fd526d73c290ea43a","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"5bc2d50fb66b46f86543d5153a188eb1486d0b6e","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"f86b20ec8d17d77bddc02c5c86cfa2389d84ecff","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"770bf0a35f0620b526fd4193889d1e77084e4c43","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"933880a8bc9b4042223a79255c0b1021cdc36991","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"},{"lessThan":"d5487249a81ea658717614009c8f46acc5b7101a","status":"affected","version":"33a3bb4a3345bb511f9c69c913da95d4693e2a4e","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/tp_meter.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.8"},{"lessThan":"4.8","status":"unaffected","version":"0","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":"5.15.210","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.176","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.34","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.11","versionStartIncluding":"4.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"4.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: directly shut down timer on cleanup\n\nbatadv_tp_sender_cleanup() was calling timer_delete_sync() followed by\ntimer_delete() to guard against the timer handler re-arming itself between\nthe two calls. This double-deletion hack relied on the sending status being\nset to 0 to suppress re-arming.\n\nReplace both calls with a single timer_shutdown_sync(). This function both\nwaits for any running timer callback to complete (like timer_delete_sync())\nand permanently disarms the timer so it cannot be re-armed afterwards,\nmaking re-arming prevention unconditional and self-documenting.\n\nThe re-arming property is also required because otherwise:\n\n1. context 0 (batadv_tp_recv_ack()) checks in\n   batadv_tp_reset_sender_timer() if sending is still 1 -> it is\n2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in\n   this process forces the kthread to stop timer in\n   batadv_tp_sender_cleanup()\n3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the\n   timer -> but the reference for it is already gone"}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:43:14.395Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/00bf4bb9947b1190a8be8d9b6a1bcbfa3707785c"},{"url":"https://git.kernel.org/stable/c/74a76634055462833446684fd526d73c290ea43a"},{"url":"https://git.kernel.org/stable/c/5bc2d50fb66b46f86543d5153a188eb1486d0b6e"},{"url":"https://git.kernel.org/stable/c/f86b20ec8d17d77bddc02c5c86cfa2389d84ecff"},{"url":"https://git.kernel.org/stable/c/770bf0a35f0620b526fd4193889d1e77084e4c43"},{"url":"https://git.kernel.org/stable/c/933880a8bc9b4042223a79255c0b1021cdc36991"},{"url":"https://git.kernel.org/stable/c/d5487249a81ea658717614009c8f46acc5b7101a"}],"title":"batman-adv: tp_meter: directly shut down timer on cleanup","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64093","datePublished":"2026-07-19T15:40:01.172Z","dateReserved":"2026-07-19T07:54:57.032Z","dateUpdated":"2026-07-20T13:43:14.395Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:50","lastModifiedDate":"2026-07-20 15:17:08","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64093","Ordinal":"1","Title":"batman-adv: tp_meter: directly shut down timer on cleanup","CVE":"CVE-2026-64093","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64093","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tp_meter: directly shut down timer on cleanup\n\nbatadv_tp_sender_cleanup() was calling timer_delete_sync() followed by\ntimer_delete() to guard against the timer handler re-arming itself between\nthe two calls. This double-deletion hack relied on the sending status being\nset to 0 to suppress re-arming.\n\nReplace both calls with a single timer_shutdown_sync(). This function both\nwaits for any running timer callback to complete (like timer_delete_sync())\nand permanently disarms the timer so it cannot be re-armed afterwards,\nmaking re-arming prevention unconditional and self-documenting.\n\nThe re-arming property is also required because otherwise:\n\n1. context 0 (batadv_tp_recv_ack()) checks in\n   batadv_tp_reset_sender_timer() if sending is still 1 -> it is\n2. context 1 changes in batadv_tp_sender_shutdown() sending to 0 and in\n   this process forces the kthread to stop timer in\n   batadv_tp_sender_cleanup()\n3. context 0 continues in batadv_tp_reset_sender_timer() and rearms the\n   timer -> but the reference for it is already gone","Type":"Description","Title":"batman-adv: tp_meter: directly shut down timer on cleanup"}]}}}