What is CVE-2026-64056?

CVE-2026-64056 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10, affecting Linux kernel versions from 4.16 onward and patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-64056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-64056?

CVE-2026-64056 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-2026-64056?

Yes, CVE-2026-64056 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-64056 actively exploited?

CVE-2026-64056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-64056

Critical

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: cortina: Make RX SKB per-port The SKB used to assemble packets from fragments in gmac_rx() is static local, but the Gemini has two ethernet ports, meaning there can be races between the ports on a bad day if a device is using both. Make the RX SKB a per-port variable and carry it over between invocations in the port struct instead. Zero the pointer once we call napi_gro_frags(), on error (after calling napi_free_frags()) or if the port is stopped. Zero it in some place where not strictly necessary just to emphasize what is going on. This was found by Sashiko during normal patch review.

Package Linux Kernel

Published 2026-07-19

Last modified 2026-09-02

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

Affected versions

Linux kernel versions 4.16 and later are affected. Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.142, 6.12.92, 6.18.34, 7.0.11, 7.1 and their respective stable series.

Affected from

≥ 4.16

Fixed in

✓ 5.10.258 5.10.x ✓ 5.15.209 5.15.x ✓ 6.1.175 6.1.x ✓ 6.6.142 6.6.x ✓ 6.12.92 6.12.x ✓ 6.18.34 6.18.x ✓ 7.0.11 7.0.x ✓ 7.1

References

8 total

Kernel Git
https://git.kernel.org/stable/c/06937db21ee311ed07eba47954447245041a982d

Patch
Kernel Git
https://git.kernel.org/stable/c/27856d533eca3804008695f61c1e4d5ff984196b

Patch
Kernel Git
https://git.kernel.org/stable/c/3b249988d774dacf13b203817e971934a42243c4

Patch
Kernel Git
https://git.kernel.org/stable/c/67a35e7da7ef9d2f000aa758552a128324c604a0

Patch
Kernel Git
https://git.kernel.org/stable/c/6bba24e9ebe6f1c0b356cd471e36bdc7fa434897

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2026-64056

Severity Critical

CVSS score 9.8 / 10

CVSS version 3.1

Published 2026-07-19

Modified 2026-09-02

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-64056?

CVE-2026-64056 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.8 out of 10 . It affects Linux kernel versions from 4.16 onward and has been patched in 5.10.258, 5.15.209, 6.1.175 and others. CVE-2026-64056 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-64056?

CVE-2026-64056 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-2026-64056?

Yes. CVE-2026-64056 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others. If you are running Linux kernel 4.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-64056 actively exploited?

No. CVE-2026-64056 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.