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CVE-2026-64056

CRITICALCVSS 9.8/10EPSS 0.55%

Last modified

CVE-2026-64056 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.55% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
0.55%

43.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 27856d533eca3804008695f61c1e4d5ff984196b; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < b6b22824b30e48ce1df3a2e80990f4b8505deb50; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 6bba24e9ebe6f1c0b356cd471e36bdc7fa434897; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 3b249988d774dacf13b203817e971934a42243c4; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 72158ea185b27afae163949b0e86164cb6b64e55; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < cfd62907f3cdbc3b6da8f49ba907c0390018fe5e; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 67a35e7da7ef9d2f000aa758552a128324c604a0; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 06937db21ee311ed07eba47954447245041a982d
LinuxLinux4.16

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

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.
How severe is CVE-2026-64056?
CVE-2026-64056 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.55% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64056?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST