What is CVE-2026-64384?

CVE-2026-64384 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 6.6.32 onward and patched in 6.6.145, 6.12.96, 6.18.39 and others. CVE-2026-64384 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64384?

CVE-2026-64384 has a CVSS score of 9.8 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2026-64384?

Yes, CVE-2026-64384 has been patched. Fixed versions include 6.6.145, 6.12.96, 6.18.39 and others. If you are running Linux kernel 6.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64384 actively exploited?

CVE-2026-64384 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64384

Critical

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

Package Linux Kernel

Published 2026-07-25

Last modified 2026-09-04

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.8

out of 10

Critical

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-415

CVE-2026-64384 is classified as CWE-415

See CWE-415 on MITRE CWE for full details on this weakness type.

Affected versions

Linux kernel versions 6.6.32, 6.8 and later are affected. Fixed in 6.6.145, 6.12.96, 6.18.39, 7.1.4, 7.2 and their respective stable series.

Affected from

≥ 6.6.32 ≥ 6.8

Fixed in

✓ 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

5 total

Kernel Git
https://git.kernel.org/stable/c/145f820dcbb2cced374f2532f8a61a44dce4a615

Patch
Kernel Git
https://git.kernel.org/stable/c/52af1975f0dfae990c5a0e85872cc41be0e88a68

Patch
Kernel Git
https://git.kernel.org/stable/c/5821f9dbb8b5b24391850a13418e633edd0fb003

Patch
Kernel Git
https://git.kernel.org/stable/c/901891513951bc8322ece754863909ea45af95c6

Patch
Kernel Git
https://git.kernel.org/stable/c/d684f4134998085702009b94c35c2003fc9e72d3

Patch

Details

CVE ID CVE-2026-64384

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-07-25

Modified 2026-09-04

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64384?

CVE-2026-64384 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 6.6.32 onward and has been patched in 6.6.145, 6.12.96, 6.18.39 and others. CVE-2026-64384 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64384?

CVE-2026-64384 has a CVSS score of 9.8 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2026-64384?

Yes. CVE-2026-64384 has been patched. Fixed versions include 6.6.145, 6.12.96, 6.18.39 and others. If you are running Linux kernel 6.6.32 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64384 actively exploited?

No. CVE-2026-64384 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.