CVE-2026-64056 (CVSS 9.8)

Description

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.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0056

Probability of exploitation

0.43%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/06937db21ee311ed07eba47954447245041a982d https://git.kernel.org/stable/c/27856d533eca3804008695f61c1e4d5ff984196b https://git.kernel.org/stable/c/3b249988d774dacf13b203817e971934a42243c4 https://git.kernel.org/stable/c/67a35e7da7ef9d2f000aa758552a128324c604a0 https://git.kernel.org/stable/c/6bba24e9ebe6f1c0b356cd471e36bdc7fa434897 https://git.kernel.org/stable/c/72158ea185b27afae163949b0e86164cb6b64e55 https://git.kernel.org/stable/c/b6b22824b30e48ce1df3a2e80990f4b8505deb50 https://git.kernel.org/stable/c/cfd62907f3cdbc3b6da8f49ba907c0390018fe5e

Frequently Asked Questions

What is CVE-2026-64056? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64056? +

CVE-2026-64056 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0056, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-64056? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-64056