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Review reviewCritical

CVE-2026-64056

Linux

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 emp...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

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 emp...

Affected product and versions

Product
Linux
Affected versions
>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 27856d533eca3804008695f61c1e4d5ff984196b, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < b6b22824b30e48ce1df3a2e80990f4b8505deb50, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 6bba24e9ebe6f1c0b356cd471e36bdc7fa434897, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 3b249988d774dacf13b203817e971934a42243c4, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 72158ea185b27afae163949b0e86164cb6b64e55, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < cfd62907f3cdbc3b6da8f49ba907c0390018fe5e, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 67a35e7da7ef9d2f000aa758552a128324c604a0, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 06937db21ee311ed07eba47954447245041a982d, >= 4.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available