CVE-2026-64125 Linux CVE debrief

Who should care

Users of Linux kernel with bcmgenet driver, particularly those with GENET hardware, should review their kernel versions and apply the fix to prevent RX traffic from stopping. Operators, platform administrators, vulnerability management teams, and security teams should be aware of this issue and its impact.

Technical summary

The bcmgenet driver in the Linux kernel had a vulnerability where setting RBUF_EEE_EN | RBUF_PM_EN in RBUF_ENERGY_CTRL could break the RX path on GENET hardware once MAC EEE becomes active. This happened because the bits were not properly cleared during resets, causing RX traffic to stop flowing. The fix clears these bits to prevent the issue. Users with GENET hardware and Linux kernel versions prior to the fix should review their kernel versions and apply the update. The issue was reported and resolved in the Linux kernel, with evidence available in the stable kernel tree. Defenders should verify the presence of the fix and review the official advisory for affected scope and severity. Additional verification tasks include checking relevant monitoring, detection, and logs for exposed assets.

Defensive priority

Medium

Recommended defensive actions

• Update Linux kernel to the latest version
• Disable EEE on bcmgenet interfaces if not needed
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance

Evidence notes

The issue was reported and resolved in the Linux kernel. The fix is available in the stable kernel tree. Evidence is limited, but defenders should verify the presence of the fix in their Linux kernel versions and review the official advisory for affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.