Bug 2396393 (CVE-2023-53374)

Summary: CVE-2023-53374 kernel: Bluetooth: hci_conn: fail SCO/ISO via hci_conn_failed if ACL gone early
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-09-18 14:02:29 UTC 
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.
Comment 1 Keith Grant 2025-09-18 16:26:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091855-CVE-2023-53374-d003@gregkh/T