{"id":"CVE-2021-3573","details":"A use-after-free in function hci_sock_bound_ioctl() of the Linux kernel HCI subsystem was found in the way user calls ioct HCIUNBLOCKADDR or other way triggers race condition of the call hci_unregister_dev() together with one of the calls hci_sock_blacklist_add(), hci_sock_blacklist_del(), hci_get_conn_info(), hci_get_auth_info(). A privileged local user could use this flaw to crash the system or escalate their privileges on the system. This flaw affects the Linux kernel versions prior to 5.13-rc5.","modified":"2026-04-16T04:37:34.983336307Z","published":"2021-08-13T14:15:07.617Z","related":["ALSA-2021:4356","SUSE-SU-2021:2303-1","SUSE-SU-2021:2305-1","SUSE-SU-2021:2325-1","SUSE-SU-2021:2352-1","SUSE-SU-2021:2426-1","SUSE-SU-2021:3360-1","SUSE-SU-2021:3361-1","SUSE-SU-2021:3371-1","SUSE-SU-2021:3374-1","SUSE-SU-2021:3401-1","SUSE-SU-2021:3440-1","SUSE-SU-2021:3443-1","SUSE-SU-2021:3459-1","openSUSE-SU-2021:2305-1","openSUSE-SU-2021:2352-1"],"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2023/07/02/1"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=1966578"},{"type":"FIX","url":"https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/commit/?id=e305509e678b3a4af2b3cfd410f409f7cdaabb52"},{"type":"EVIDENCE","url":"https://www.openwall.com/lists/oss-security/2021/06/08/2"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"5.13"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"6.0"}]},{"events":[{"introduced":"0"},{"last_affected":"7.0"}]},{"events":[{"introduced":"0"},{"last_affected":"8.0"}]},{"events":[{"introduced":"0"},{"last_affected":"34"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3573.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"}]}