What is CVE-2026-53072?

CVE-2026-53072 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10, classified as a Improper Locking flaw (CWE-667), affecting Linux kernel versions from 3.17 onward and patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-53072 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-53072?

CVE-2026-53072 has a CVSS score of 8.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-53072?

Yes, CVE-2026-53072 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 3.17 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-53072 actively exploited?

CVE-2026-53072 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Improper Locking (CWE-667)?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/667.html

CVE-2026-53072

High

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.

Package Linux Kernel

Published 2026-06-24

Last modified 2026-07-21

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.8

out of 10

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-667

CVE-2026-53072 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.17 and later are affected. Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10, 7.1 and their respective stable series.

Affected from

≥ 3.17

Fixed in

✓ 5.10.258 5.10.x ✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.141 6.6.x ✓ 6.12.91 6.12.x ✓ 6.18.33 6.18.x ✓ 7.0.10 7.0.x ✓ 7.1

References

8 total

Kernel Git
https://git.kernel.org/stable/c/385b2d0468a0871fc716c549fa3b0c257c7dbcb3

Patch
Kernel Git
https://git.kernel.org/stable/c/541d5bf9b5afaf41090b2a3aa7b47f2db2ff801f

Patch
Kernel Git
https://git.kernel.org/stable/c/5c7209a341ff2ac338b2b0375c34a307b37c9ac2

Patch
Kernel Git
https://git.kernel.org/stable/c/60e3f4ff02d1f2d55bfbf2ca32a97285a9771ee4

Patch
Kernel Git
https://git.kernel.org/stable/c/6b4d226d01ab7da0d2027a2a1e3a6079152e5065

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-53072

Severity High

CVSS score 8.8 / 10

CVSS version 3.1

Published 2026-06-24

Modified 2026-07-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-53072?

CVE-2026-53072 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 3.17 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-53072 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-53072?

CVE-2026-53072 has a CVSS score of 8.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-53072?

Yes. CVE-2026-53072 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 3.17 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-53072 actively exploited?

No. CVE-2026-53072 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.