{"api_version":"1","generated_at":"2026-07-23T15:43:55+00:00","cve":"CVE-2026-64206","urls":{"html":"https://cve.report/CVE-2026-64206","api":"https://cve.report/api/cve/CVE-2026-64206.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64206","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64206"},"summary":{"title":"Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: cancel pending_rx_work before taking conn->lock\n\nl2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for\npending_rx_work.  process_pending_rx() takes the same mutex, so teardown\ncan deadlock against the worker it is flushing.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the l2cap_conn_ready() -> queue_work(...,\n&conn->pending_rx_work) submit path, the l2cap_conn_del() ->\ncancel_work_sync(&conn->pending_rx_work) teardown path, and the\nprocess_pending_rx() -> mutex_lock(&conn->lock) worker edge.  Lockdep\n\n  WARNING: possible circular locking dependency detected\n  process_pending_rx+0x21/0x2a [vuln_msv]\n  l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv]\n  *** DEADLOCK ***\n\nCancel pending_rx_work before taking conn->lock, matching the existing\nlock-before-drain ordering used for the two delayed works in the same\nteardown path.  The pending_rx queue is still purged after the work has\nbeen cancelled and conn->lock has been acquired.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-20 17:18:22","updated_at":"2026-07-20 17:18:22"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e96fbac8d3a73b0bc165383c092a30628561d320","name":"https://git.kernel.org/stable/c/e96fbac8d3a73b0bc165383c092a30628561d320","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2641a9e0a1dd4af2e21995470a21d55dd35e5203","name":"https://git.kernel.org/stable/c/2641a9e0a1dd4af2e21995470a21d55dd35e5203","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d5616beb3355b5fca2280d796c1cf7ada4ee6551","name":"https://git.kernel.org/stable/c/d5616beb3355b5fca2280d796c1cf7ada4ee6551","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64206","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64206","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 d5616beb3355b5fca2280d796c1cf7ada4ee6551 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 e96fbac8d3a73b0bc165383c092a30628561d320 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ab56c3a6eccb215034b0cb096e0313441cbf2a4 2641a9e0a1dd4af2e21995470a21d55dd35e5203 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ee805f9499ebd0edf0877990968543c752043b59 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.15.5 3.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 3.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc3 * 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/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d5616beb3355b5fca2280d796c1cf7ada4ee6551","status":"affected","version":"7ab56c3a6eccb215034b0cb096e0313441cbf2a4","versionType":"git"},{"lessThan":"e96fbac8d3a73b0bc165383c092a30628561d320","status":"affected","version":"7ab56c3a6eccb215034b0cb096e0313441cbf2a4","versionType":"git"},{"lessThan":"2641a9e0a1dd4af2e21995470a21d55dd35e5203","status":"affected","version":"7ab56c3a6eccb215034b0cb096e0313441cbf2a4","versionType":"git"},{"status":"affected","version":"ee805f9499ebd0edf0877990968543c752043b59","versionType":"git"},{"lessThan":"3.16","status":"affected","version":"3.15.5","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/l2cap_core.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.16"},{"lessThan":"3.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc3","versionStartIncluding":"3.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: cancel pending_rx_work before taking conn->lock\n\nl2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for\npending_rx_work.  process_pending_rx() takes the same mutex, so teardown\ncan deadlock against the worker it is flushing.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the l2cap_conn_ready() -> queue_work(...,\n&conn->pending_rx_work) submit path, the l2cap_conn_del() ->\ncancel_work_sync(&conn->pending_rx_work) teardown path, and the\nprocess_pending_rx() -> mutex_lock(&conn->lock) worker edge.  Lockdep\n\n  WARNING: possible circular locking dependency detected\n  process_pending_rx+0x21/0x2a [vuln_msv]\n  l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv]\n  *** DEADLOCK ***\n\nCancel pending_rx_work before taking conn->lock, matching the existing\nlock-before-drain ordering used for the two delayed works in the same\nteardown path.  The pending_rx queue is still purged after the work has\nbeen cancelled and conn->lock has been acquired."}],"providerMetadata":{"dateUpdated":"2026-07-20T16:27:53.885Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d5616beb3355b5fca2280d796c1cf7ada4ee6551"},{"url":"https://git.kernel.org/stable/c/e96fbac8d3a73b0bc165383c092a30628561d320"},{"url":"https://git.kernel.org/stable/c/2641a9e0a1dd4af2e21995470a21d55dd35e5203"}],"title":"Bluetooth: L2CAP: cancel pending_rx_work before taking conn->lock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64206","datePublished":"2026-07-20T16:27:53.885Z","dateReserved":"2026-07-19T15:36:31.769Z","dateUpdated":"2026-07-20T16:27:53.885Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-20 17:18:22","lastModifiedDate":"2026-07-20 17:18:22","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64206","Ordinal":"1","Title":"Bluetooth: L2CAP: cancel pending_rx_work before taking conn->loc","CVE":"CVE-2026-64206","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64206","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: cancel pending_rx_work before taking conn->lock\n\nl2cap_conn_del() takes conn->lock and then calls cancel_work_sync() for\npending_rx_work.  process_pending_rx() takes the same mutex, so teardown\ncan deadlock against the worker it is flushing.\n\nThis issue was found by our static analysis tool and then manually\nreviewed against the current tree.\n\nThe grounded PoC kept the l2cap_conn_ready() -> queue_work(...,\n&conn->pending_rx_work) submit path, the l2cap_conn_del() ->\ncancel_work_sync(&conn->pending_rx_work) teardown path, and the\nprocess_pending_rx() -> mutex_lock(&conn->lock) worker edge.  Lockdep\n\n  WARNING: possible circular locking dependency detected\n  process_pending_rx+0x21/0x2a [vuln_msv]\n  l2cap_conn_del.constprop.0+0x3f/0x4e [vuln_msv]\n  *** DEADLOCK ***\n\nCancel pending_rx_work before taking conn->lock, matching the existing\nlock-before-drain ordering used for the two delayed works in the same\nteardown path.  The pending_rx queue is still purged after the work has\nbeen cancelled and conn->lock has been acquired.","Type":"Description","Title":"Bluetooth: L2CAP: cancel pending_rx_work before taking conn->loc"}]}}}