PT-2026-51966 · Linux · Linux

Published 2026-06-24 · Updated 2026-06-24 · CVE-2026-53072

Mitre

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: fix locking in hci conn request evt() with HCI PROTO DEFER

When protocol sets HCI PROTO DEFER, hci conn request evt() calls hci connect cfm(conn) without hdev->lock. Generally hci connect cfm() assumes it is held, and if conn is deleted concurrently -> UAF.

Only SCO and ISO set HCI PROTO DEFER and only for defer setup listen, and HCI EV CONN REQUEST is not generated for ISO. In the non-deferred listening socket code paths, hci connect cfm(conn) is called with hdev->lock held.

Fix by holding the lock.

Related Identifiers

CVE-2026-53072

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-53072 · Security Note
• https://git.kernel.org/stable/c/60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4 · Note
• https://git.kernel.org/stable/c/541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f · Note
• https://git.kernel.org/stable/c/385b2d0468a0871fc716c549fa3b0c257c7dbcb3 · Note
• https://git.kernel.org/stable/c/c7777f534a8018ae4bb1c80d8925af4df588a314 · Note
• https://git.kernel.org/stable/c/9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e · Note
• https://git.kernel.org/stable/c/6b4d226d01ab7da0d2027a2a1e3a6079152e5065 · Note
• https://git.kernel.org/stable/c/c27224daf0b08efbb2b24ed64b6139b294f5473a · Note
• https://git.kernel.org/stable/c/5c7209a341ff2ac338b2b0375c34a307b37c9ac2 · Note