What is CVE-2026-64408?

CVE-2026-64408 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 3.13 onward and patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64408 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64408?

CVE-2026-64408 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-2026-64408?

Yes, CVE-2026-64408 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 3.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64408 actively exploited?

CVE-2026-64408 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2026-64408

High

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: bnep: pin L2CAP connection during netdev registration bnep_add_connection() reads the L2CAP connection without holding the channel lock, then passes its HCI device to register_netdev(). Controller teardown can clear and release that connection concurrently, leaving the network device registration path to dereference a freed parent device. Take a reference to the L2CAP connection while holding the channel lock. Retain it until register_netdev() has taken the parent device reference.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-10-19

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-416

CVE-2026-64408 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.13 and later are affected. Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 and their respective stable series.

Affected from

≥ 3.13

Fixed in

✓ 5.10.261 5.10.x ✓ 5.15.212 5.15.x ✓ 6.1.178 6.1.x ✓ 6.6.145 6.6.x ✓ 6.12.96 6.12.x ✓ 6.18.39 6.18.x ✓ 7.1.4 7.1.x ✓ 7.2

References

8 total

Kernel Git
https://git.kernel.org/stable/c/390b5db3ff8745187f094c4e915663b7b1f98944

Patch
Kernel Git
https://git.kernel.org/stable/c/46a88784c4c9b96954dd86f747ce93f65efa1302

Patch
Kernel Git
https://git.kernel.org/stable/c/551ae773ec64045b4e72099132654887e0270bcc

Patch
Kernel Git
https://git.kernel.org/stable/c/563a8573047182f550b1e1e030615755cd8c41da

Patch
Kernel Git
https://git.kernel.org/stable/c/a6b22dbd80926556290ad2243be25218d6956a19

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-64408

Severity High

CVSS score 8.8 / 10

CVSS version 3.1

Published 2026-07-25

Modified 2026-10-19

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64408?

CVE-2026-64408 is a High severity Linux kernel vulnerability with a CVSS score of 8.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 3.13 onward and has been patched in 5.10.261, 5.15.212, 6.1.178 and others. CVE-2026-64408 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64408?

CVE-2026-64408 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-2026-64408?

Yes. CVE-2026-64408 has been patched. Fixed versions include 5.10.261, 5.15.212, 6.1.178 and others. If you are running Linux kernel 3.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64408 actively exploited?

No. CVE-2026-64408 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.