Description
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.
References (4)
Core 4
Core References
Mailing List mailing-list
http://www.openwall.com/lists/oss-security/2023/07/02/1
Issue Tracking, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1966578
Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/commit/?id=e305509e678b3a4af2b3cfd410f409f7cdaabb52
Exploit, Mailing List, Third Party Advisory
https://www.openwall.com/lists/oss-security/2021/06/08/2
Scores
CVSS v3
6.4
EPSS
0.0003
EPSS Percentile
8.7%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-362
Status
published
Products (6)
fedoraproject/fedora
34
linux/linux_kernel
5.13 rc1 (4 CPE variants)
linux/linux_kernel
< 5.13
redhat/enterprise_linux
6.0
redhat/enterprise_linux
7.0
redhat/enterprise_linux
8.0
Published
Aug 13, 2021
Tracked Since
Feb 18, 2026