Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-53072
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:21 UTC
Updated2026-07-21 17:40:24 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.002470000 probability, percentile 0.159540000 (date 2026-07-14)

Problem Types: CWE-667

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4 git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 c7777f534a8018ae4bb1c80d8925af4df588a314 git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 6b4d226d01ab7da0d2027a2a1e3a6079152e5065 git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 385b2d0468a0871fc716c549fa3b0c257c7dbcb3 git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 c27224daf0b08efbb2b24ed64b6139b294f5473a git Not specified
CNA Linux Linux affected 70c464256310e1c3716099b9d02ece4169272f73 5c7209a341ff2ac338b2b0375c34a307b37c9ac2 git Not specified
CNA Linux Linux affected 3.17 Not specified
CNA Linux Linux unaffected 3.17 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c7777f534a8018ae4bb1c80d8925af4df588a314 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/6b4d226d01ab7da0d2027a2a1e3a6079152e5065 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/c27224daf0b08efbb2b24ed64b6139b294f5473a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/385b2d0468a0871fc716c549fa3b0c257c7dbcb3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/5c7209a341ff2ac338b2b0375c34a307b37c9ac2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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