UBUNTU-CVE-2021-3573
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.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
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1 explicit affected versions
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11 explicit affected versions
1 explicit affected versions
2 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://ubuntu.com/security/CVE-2021-3573
- https://ubuntu.com/security/notices/USN-5015-1
- https://ubuntu.com/security/notices/USN-5044-1
- https://ubuntu.com/security/notices/USN-5045-1
- https://ubuntu.com/security/notices/USN-5046-1
- https://ubuntu.com/security/notices/USN-5050-1
- https://ubuntu.com/security/notices/USN-5343-1
- https://www.cve.org/CVERecord?id=CVE-2021-3573
- https://www.openwall.com/lists/oss-security/2021/06/08/2