{"id":"CVE-2026-74537","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-74537","summary":"Bluetooth: ISO: hold sk properly in iso_conn_ready","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: hold sk properly in iso_conn_ready\n\nsk deref in iso_conn_ready must be done either under conn->lock, or\nholding a refcount, to avoid concurrent close. conn->sk is currently\naccessed without either:\n\n    [Task 1]            [Task 2]\n                        iso_sock_release\n    iso_conn_ready\n      sk = conn->sk\n                          lock_sock(sk)\n                            conn->sk = NULL\n      lock_sock(sk)\n                          release_sock(sk)\n                          iso_sock_kill(sk)\n       UAF on sk deref\n\nFix possible UAF by holding sk refcount in iso_conn_ready().  Also\nrecheck after lock_sock that the socket is still valid.  Adjust locking\nso conn->sk is cleared only under lock_sock.","published":"2026-08-15T12:27:49.668Z","modified":"2026-08-18T03:56:50.645352474Z","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":"6.18.44"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0d255e63fcf3f13a570d7ac11678fa1164ac015c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1308d72903d792d10b82bc4ef08b8a4452308b04"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74537.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74537"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T03:56:50.645352474Z"}}