CVE-2026-53072

Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER

State: Published
Severity: 8.8 High
Published: Jun 24, 2026
Updated: Oct 19, 2026
Reserved: Jun 9, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
LinuxLinux	70c464256310e1c3716099b9d02ece4169272f73 to before 60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4Affected 70c464256310e1c3716099b9d02ece4169272f73 to before 9d4a6c0f43fc5e4d4f062e8e450e5483eb74176eAffected 70c464256310e1c3716099b9d02ece4169272f73 to before c7777f534a8018ae4bb1c80d8925af4df588a314Affected 70c464256310e1c3716099b9d02ece4169272f73 to before 6b4d226d01ab7da0d2027a2a1e3a6079152e5065Affected 70c464256310e1c3716099b9d02ece4169272f73 to before 541d5bf9b5afaf41090b2a3aa7b47f2db2ff801fAffected 70c464256310e1c3716099b9d02ece4169272f73 to before 385b2d0468a0871fc716c549fa3b0c257c7dbcb3Affected 70c464256310e1c3716099b9d02ece4169272f73 to before c27224daf0b08efbb2b24ed64b6139b294f5473aAffected 70c464256310e1c3716099b9d02ece4169272f73 to before 5c7209a341ff2ac338b2b0375c34a307b37c9ac2Affected
LinuxLinux	3.17Affected before 3.17Not affected 5.10.258 through 5.10.Not affected 5.15.209 through 5.15.Not affected 6.1.175 through 6.1.Not affected 6.6.141 through 6.6.Not affected 6.12.91 through 6.12.Not affected 6.18.33 through 6.18.Not affected 7.0.10 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

70c464256310e1c3716099b9d02ece4169272f73 to before 60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4Affected
70c464256310e1c3716099b9d02ece4169272f73 to before 9d4a6c0f43fc5e4d4f062e8e450e5483eb74176eAffected
70c464256310e1c3716099b9d02ece4169272f73 to before c7777f534a8018ae4bb1c80d8925af4df588a314Affected
70c464256310e1c3716099b9d02ece4169272f73 to before 6b4d226d01ab7da0d2027a2a1e3a6079152e5065Affected
70c464256310e1c3716099b9d02ece4169272f73 to before 541d5bf9b5afaf41090b2a3aa7b47f2db2ff801fAffected
70c464256310e1c3716099b9d02ece4169272f73 to before 385b2d0468a0871fc716c549fa3b0c257c7dbcb3Affected
70c464256310e1c3716099b9d02ece4169272f73 to before c27224daf0b08efbb2b24ed64b6139b294f5473aAffected
70c464256310e1c3716099b9d02ece4169272f73 to before 5c7209a341ff2ac338b2b0375c34a307b37c9ac2Affected

LinuxLinux

3.17Affected
before 3.17Not affected
5.10.258 through 5.10.*Not affected
5.15.209 through 5.15.*Not affected
6.1.175 through 6.1.*Not affected
6.6.141 through 6.6.*Not affected
6.12.91 through 6.12.*Not affected
6.18.33 through 6.18.*Not affected
7.0.10 through 7.0.*Not affected
7.1 and laterNot affected

References

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