CVE-2026-53072
Bluetooth: fix locking in hci_conn_request_evt() with HCI_PROTO_DEFER
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.
INFO
Published Date :
June 24, 2026, 5:17 p.m.
Last Modified :
July 21, 2026, 5:40 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply kernel patch to hold lock.
- Update Linux kernel to the latest version.
- Review related locking mechanisms.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53072.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53072 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53072
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53072 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53072 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added CWE CWE-667 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.141 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.91 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.33 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.10 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.17 up to (excluding) 5.10.258 Added Reference Type kernel.org: https://git.kernel.org/stable/c/385b2d0468a0871fc716c549fa3b0c257c7dbcb3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5c7209a341ff2ac338b2b0375c34a307b37c9ac2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6b4d226d01ab7da0d2027a2a1e3a6079152e5065 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c27224daf0b08efbb2b24ed64b6139b294f5473a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c7777f534a8018ae4bb1c80d8925af4df588a314 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 28, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jun. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': '60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': '9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': 'c7777f534a8018ae4bb1c80d8925af4df588a314', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': '6b4d226d01ab7da0d2027a2a1e3a6079152e5065', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': '541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': '385b2d0468a0871fc716c549fa3b0c257c7dbcb3', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': 'c27224daf0b08efbb2b24ed64b6139b294f5473a', 'versionType': 'git'}, {'status': 'affected', 'version': '70c464256310e1c3716099b9d02ece4169272f73', 'lessThan': '5c7209a341ff2ac338b2b0375c34a307b37c9ac2', 'versionType': 'git'}], 'programFiles': ['net/bluetooth/hci_event.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '3.17'}, {'status': 'unaffected', 'version': '0', 'lessThan': '3.17', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.141', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.91', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.33', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.10', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/bluetooth/hci_event.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/385b2d0468a0871fc716c549fa3b0c257c7dbcb3 Added Reference https://git.kernel.org/stable/c/541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f Added Reference https://git.kernel.org/stable/c/5c7209a341ff2ac338b2b0375c34a307b37c9ac2 Added Reference https://git.kernel.org/stable/c/60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4 Added Reference https://git.kernel.org/stable/c/6b4d226d01ab7da0d2027a2a1e3a6079152e5065 Added Reference https://git.kernel.org/stable/c/9d4a6c0f43fc5e4d4f062e8e450e5483eb74176e Added Reference https://git.kernel.org/stable/c/c27224daf0b08efbb2b24ed64b6139b294f5473a Added Reference https://git.kernel.org/stable/c/c7777f534a8018ae4bb1c80d8925af4df588a314