{"api_version":"1","generated_at":"2026-07-23T19:51:09+00:00","cve":"CVE-2026-63945","urls":{"html":"https://cve.report/CVE-2026-63945","api":"https://cve.report/api/cve/CVE-2026-63945.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-63945","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-63945"},"summary":{"title":"Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: serialize iso_sock_clear_timer with socket lock\n\niso_sock_close() calls iso_sock_clear_timer() before acquiring\nlock_sock(sk).\n\niso_sock_clear_timer() reads iso_pi(sk)->conn twice without the\nsocket lock held:\n\n    if (!iso_pi(sk)->conn)\n        return;\n    cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);\n\nConcurrently, iso_conn_del() executes under lock_sock(sk) and calls\niso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in\nthe final reference to the connection being dropped:\n\n    CPU0                         CPU1\n    ----                         ----\n    iso_sock_clear_timer()\n      if (conn != NULL) ...      lock_sock(sk)\n                                   iso_chan_del()\n                                   iso_pi(sk)->conn = NULL\n      cancel_delayed_work(conn)  /* NULL deref or UAF */\n\niso_pi(sk)->conn is not stable across the unlock window, causing a\nNULL pointer dereference or use-after-free.\n\nSerialize iso_sock_clear_timer() with the socket lock by moving it\ninside lock_sock()/release_sock(), matching the pattern used in\niso_conn_del() and all other call sites.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-19 16:17:13","updated_at":"2026-07-20 15:16:58"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348","name":"https://git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393","name":"https://git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859","name":"https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5","name":"https://git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef","name":"https://git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa","name":"https://git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-63945","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63945","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 35f68f36d9883d56dec21cf85f7556d4657fc393 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 996c2104d0726a8fe584f85b3d6327197374a348 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a bc08c15746f25f41dd0508b25780d1e84acbb2ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ccf74f2390d60a2f9a75ef496d2564abb478f46a 4b5f8e608749b7e8fa386c6e4301cf9272595859 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.0","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.0 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 6.18.35 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.12 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":{"cve_year":"2026","cve_id":"63945","cve":"CVE-2026-63945","epss":"0.002050000","percentile":"0.107240000","score_date":"2026-07-20","updated_at":"2026-07-21 00:13:13"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"35f68f36d9883d56dec21cf85f7556d4657fc393","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"996c2104d0726a8fe584f85b3d6327197374a348","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"bc08c15746f25f41dd0508b25780d1e84acbb2ef","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"},{"lessThan":"4b5f8e608749b7e8fa386c6e4301cf9272595859","status":"affected","version":"ccf74f2390d60a2f9a75ef496d2564abb478f46a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/bluetooth/iso.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.0"},{"lessThan":"6.0","status":"unaffected","version":"0","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":"6.18.35","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.12","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":"6.1.176","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.143","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.93","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.35","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.12","versionStartIncluding":"6.0","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: serialize iso_sock_clear_timer with socket lock\n\niso_sock_close() calls iso_sock_clear_timer() before acquiring\nlock_sock(sk).\n\niso_sock_clear_timer() reads iso_pi(sk)->conn twice without the\nsocket lock held:\n\n    if (!iso_pi(sk)->conn)\n        return;\n    cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);\n\nConcurrently, iso_conn_del() executes under lock_sock(sk) and calls\niso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in\nthe final reference to the connection being dropped:\n\n    CPU0                         CPU1\n    ----                         ----\n    iso_sock_clear_timer()\n      if (conn != NULL) ...      lock_sock(sk)\n                                   iso_chan_del()\n                                   iso_pi(sk)->conn = NULL\n      cancel_delayed_work(conn)  /* NULL deref or UAF */\n\niso_pi(sk)->conn is not stable across the unlock window, causing a\nNULL pointer dereference or use-after-free.\n\nSerialize iso_sock_clear_timer() with the socket lock by moving it\ninside lock_sock()/release_sock(), matching the pattern used in\niso_conn_del() and all other call sites."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-07-20T13:41:46.058Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa"},{"url":"https://git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393"},{"url":"https://git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348"},{"url":"https://git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef"},{"url":"https://git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5"},{"url":"https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859"}],"title":"Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-63945","datePublished":"2026-07-19T14:55:39.859Z","dateReserved":"2026-07-19T07:54:57.022Z","dateUpdated":"2026-07-20T13:41:46.058Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-19 16:17:13","lastModifiedDate":"2026-07-20 15:16:58","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"63945","Ordinal":"1","Title":"Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock","CVE":"CVE-2026-63945","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"63945","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: serialize iso_sock_clear_timer with socket lock\n\niso_sock_close() calls iso_sock_clear_timer() before acquiring\nlock_sock(sk).\n\niso_sock_clear_timer() reads iso_pi(sk)->conn twice without the\nsocket lock held:\n\n    if (!iso_pi(sk)->conn)\n        return;\n    cancel_delayed_work(&iso_pi(sk)->conn->timeout_work);\n\nConcurrently, iso_conn_del() executes under lock_sock(sk) and calls\niso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in\nthe final reference to the connection being dropped:\n\n    CPU0                         CPU1\n    ----                         ----\n    iso_sock_clear_timer()\n      if (conn != NULL) ...      lock_sock(sk)\n                                   iso_chan_del()\n                                   iso_pi(sk)->conn = NULL\n      cancel_delayed_work(conn)  /* NULL deref or UAF */\n\niso_pi(sk)->conn is not stable across the unlock window, causing a\nNULL pointer dereference or use-after-free.\n\nSerialize iso_sock_clear_timer() with the socket lock by moving it\ninside lock_sock()/release_sock(), matching the pattern used in\niso_conn_del() and all other call sites.","Type":"Description","Title":"Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock"}]}}}