{"id":"CVE-2026-74535","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74535","summary":"Bluetooth: ISO: avoid deadlocks in iso_sock_timeout","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid deadlocks in iso_sock_timeout\n\niso_sock_timeout() takes lock_sock, so sync disabling the timer while\nholding that lock may deadlock.\n\niso_sock_timeout() may also run concurrently with iso_conn_del(), which\nleads to UAF\n\n        [Task 1]                      [Task hdev->workqueue]\n        iso_sock_timeout              iso_conn_del\n          iso_conn_hold_unless_zero     iso_chan_del\n                           `------------> iso_conn_put\n                                      caller frees hcon\n          iso_conn_put\n            iso_conn_free\n              conn->hcon->iso_data = NULL; /* UAF */\n\nFix the deadlock by removing the disable from the lock_sock sections.\nMove the timer from iso_conn to iso_pinfo to decouple it from iso_conn\nwhich may need to be freed in lock_sock section. Convert some of the\nclear_timer to disable_timer.","published":"2026-08-15T12:27:48.449Z","modified":"2026-08-18T03:56:51.053944928Z","cvss":{"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"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.12.103"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/16d89a63e08280abeef7218970a3bbd7ca62b021"},{"type":"WEB","url":"https://git.kernel.org/stable/c/200fa1629c57a3ca2b03d3ca63fd3a9bfd910c43"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c3d5f85db80145636bb991a6005e2760012b985"},{"type":"WEB","url":"https://git.kernel.org/stable/c/82e982f54f962f72646868ddbb2c3bd9ea178568"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74535.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74535"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:51.053944928Z"}}