{"schema_version":"1.9.0","id":"CVE-2026-63945","published":"2026-07-19T14:55:39.859Z","modified":"2026-08-31T18:26:05.046238879Z","related":["SUSE-SU-2026:23066-1","SUSE-SU-2026:23068-1","SUSE-SU-2026:23193-1","SUSE-SU-2026:23194-1","SUSE-SU-2026:23221-1","SUSE-SU-2026:23231-1","SUSE-SU-2026:23237-1","SUSE-SU-2026:23241-1","SUSE-SU-2026:23244-1","SUSE-SU-2026:3790-1","SUSE-SU-2026:3810-1","openSUSE-SU-2026:21555-1"],"summary":"Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock","details":"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.","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ccf74f2390d60a2f9a75ef496d2564abb478f46a"},{"fixed":"d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa"},{"fixed":"35f68f36d9883d56dec21cf85f7556d4657fc393"},{"fixed":"996c2104d0726a8fe584f85b3d6327197374a348"},{"fixed":"bc08c15746f25f41dd0508b25780d1e84acbb2ef"},{"fixed":"51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5"},{"fixed":"4b5f8e608749b7e8fa386c6e4301cf9272595859"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63945.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.0.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.35"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.12"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63945.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/35f68f36d9883d56dec21cf85f7556d4657fc393"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859"},{"type":"WEB","url":"https://git.kernel.org/stable/c/51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/996c2104d0726a8fe584f85b3d6327197374a348"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bc08c15746f25f41dd0508b25780d1e84acbb2ef"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63945.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63945"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63945.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}