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…

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.

Scores

EPSS (exploitation in 30 days)

0.37% · top 69% of all CVEs (6 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.4.

Weakness

• CWE-362->CWE-416 (opens in a new tab)All about CWE-362 and its CVEs

Affected products

• kernel

  • affected kernel 5.13-rc5

References (4)

• https://bugzilla.redhat.com/show_bug.cgi?id=1966578 (opens in a new tab)x_transferred
• https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git/commit/?id=e305509e678b3a4af2b3cfd410f409f7cdaabb52 (opens in a new tab)x_transferred
• https://www.openwall.com/lists/oss-security/2021/06/08/2 (opens in a new tab)x_transferred
• [oss-security] 20230702 CVE-2023-3439: Linux MCTP use-after-free in mctp_sendmsg (opens in a new tab)mailing-listx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2021-3573](https://trackcve.app/badge/CVE-2021-3573.svg)](https://trackcve.app/cve/CVE-2021-3573)

Record last updated 3 Aug 2024, 17:01 UTC.