What is CVE-2026-64104?

CVE-2026-64104 is a High severity Linux kernel vulnerability with a CVSS score of 8.7 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 6.13.8 onward and patched in 6.18.34, 7.0.11 and 7.1. CVE-2026-64104 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64104?

CVE-2026-64104 has a CVSS score of 8.7 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.

Is there a patch available for CVE-2026-64104?

Yes, CVE-2026-64104 has been patched. Fixed versions include 6.18.34, 7.0.11 and 7.1. If you are running Linux kernel 6.13.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64104 actively exploited?

CVE-2026-64104 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2026-64104

High

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Explicitly leak pages in unknown state When set_memory_{encrypted,decrypted}() fail, the user cannot know at which point the function failed, meaning that the pages are left in an unknown state from the point of view of the caller. Since the pages may be left in an unencrypted state, they are not suitable for general use, and cannot be returned safely to the buddy allocator. Avoid the issue by never freeing the pages, and then do the proper accounting by calling snp_leak_pages().

Package Linux Kernel

Published 2026-07-19

Last modified 2026-08-12

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.7

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

Low

Vector string

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

Weakness type

CWE-401

CVE-2026-64104 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.13.8, 6.14 and later are affected. Fixed in 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 6.13.8 ≥ 6.14

Fixed in

✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

3 total

Kernel Git
https://git.kernel.org/stable/c/3d0cd0065deeb054b4b29236432e851806b7cc81

Patch
Kernel Git
https://git.kernel.org/stable/c/bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0

Patch
Kernel Git
https://git.kernel.org/stable/c/fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf

Patch

Details

CVE ID CVE-2026-64104

Severity High

CVSS score 8.7 / 10

CVSS version 3.1

Published 2026-07-19

Modified 2026-08-12

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64104?

CVE-2026-64104 is a High severity Linux kernel vulnerability with a CVSS score of 8.7 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 6.13.8 onward and has been patched in 6.18.34, 7.0.11 and 7.1. CVE-2026-64104 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64104?

CVE-2026-64104 has a CVSS score of 8.7 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L.
Is there a patch available for CVE-2026-64104?

Yes. CVE-2026-64104 has been patched. Fixed versions include 6.18.34, 7.0.11 and 7.1. If you are running Linux kernel 6.13.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64104 actively exploited?

No. CVE-2026-64104 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.