{"id":"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-\u003elock, or\nholding a refcount, to avoid concurrent close. conn-\u003esk is currently\naccessed without either:\n\n    [Task 1]            [Task 2]\n                        iso_sock_release\n    iso_conn_ready\n      sk = conn-\u003esk\n                          lock_sock(sk)\n                            conn-\u003esk = 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-\u003esk is cleared only under lock_sock.","modified":"2026-08-18T03:56:50.645352474Z","published":"2026-08-15T12:27:49.668Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74537.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"27c24fda62b601d6f9ca5e992502578c4310876f"},{"fixed":"4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5"},{"fixed":"1308d72903d792d10b82bc4ef08b8a4452308b04"},{"fixed":"0d255e63fcf3f13a570d7ac11678fa1164ac015c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74537.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74537.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}