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CVE-2026-64055

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: cortina: Carry over frag counter The gmac_rx() NAPI poll function assembles packets in an SKB from a ring buffer.

Published Jul 19, 2026EPSS 0.51%

Overview

CVE-2026-64055 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: cortina: Carry over frag counter

The gmac_rx() NAPI poll function assembles packets in an

SKB from a ring buffer.

If the ring buffer gets completely emptied during a poll cycle,

we exit gmac_rx(), but the packet is not yet completely

assembled in the SKB, yet the fragment counter frag_nr is

reset to zero on the next invocation.

Solve this by making the RX fragment counter a part of the

port struct, and carry it over between invocations.

Reset the fragment counter only right after calling

napi_gro_frags(), on error (after calling napi_free_frags())

or if stopping the port.

Reset it in some place where not strictly necessary just to

emphasize what is going on.

This was found by Sashiko during normal patch review.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85fRefgit.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41Refgit.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0Refgit.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8Refgit.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5Refgit.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9bRefgit.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253Refgit.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64055?

CVE-2026-64055 is a critical-severity vulnerability. It was published on July 19, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64055?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64055?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64055?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64055 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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