Use After Free in Linux
CVE-2023-53374
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early Not calling hci_(dis)connect_cfm before deleting conn referred to by a socket generally results to use-after-free. When cleaning up SCO connections when the parent ACL is deleted too early, use hci_conn_failed to do the connection cleanup properly. We also need to clean up ISO connections in a similar situation when connecting has started but LE Create CIS is not yet sent, so do it too here.
Vulnerability class: Use-After-Free
EPSS: 0.001 (4.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Linux — versions 6.4, 6.5.3, 6.6
- Linux Linux_kernel — versions 6.4
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2023-53374?
- CVE-2023-53374 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 8.8/10. Published 2025-09-18.
- How severe is CVE-2023-53374?
- High severity. CVSS v3 base score is 8.8 out of 10.