CVE-2026-64035 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability and take steps to ensure their systems are updated. They should review the official advisory and verify that the igc driver is updated. System administrators should also monitor system logs for potential issues.

Technical summary

The Linux kernel vulnerability CVE-2026-64035 was resolved by setting the tx buffer type for SMD frames in the igc driver. The igc_fpe_init_smd_frame() function initializes igc_tx_buffer fields for an SMD skb but does not set the buffer type. This can cause a stale XDP or XSK type to remain and make TX completion use the wrong cleanup path. The vulnerability affects the Linux kernel and has been resolved by setting the tx buffer type for SMD frames in the igc driver.

Defensive priority

Medium

Recommended defensive actions

• Update the Linux kernel to the latest version
• Verify that the igc driver is updated
• Monitor system logs for potential issues
• 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

Evidence notes

The CVE record was published on 2026-07-19T16:17:43.740Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the vendor. The igc_fpe_init_smd_frame() function initializes igc_tx_buffer fields for an SMD skb but does not set the buffer type, which can cause a stale XDP or XSK type to remain and make TX completion use the wrong cleanup path.

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.