CVE-2026-99059 Linux CVE debrief

Who should care

Defenders responsible for Linux kernel-based systems, particularly those using wireguard: noise, should assess exposure and prioritize patching to prevent potential response consumption. This includes operators, platform administrators, vulnerability management teams, and security teams. They should verify Linux kernel versions and apply patches as necessary to prevent potential response consumption.

Why it matters

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability to prevent potential response consumption.

• Verify Linux kernel versions for potential exposure
• Apply patches to prevent potential response consumption
• Monitor system configurations for potential vulnerabilities

Technical summary

The Linux kernel's wireguard: noise component is vulnerable to a race condition, allowing an attacker to potentially consume a response message after intermediate initiation. This vulnerability has been resolved in later Linux kernel versions. The issue arises from two threads processing the same response message, leading to a potential session reuse attack. Defenders should assess exposure and prioritize patching to prevent potential response consumption. The vulnerability affects Linux kernel versions 5.6 and later.

Defensive priority

Defenders should prioritize verifying and applying patches for Linux kernel versions affected by this vulnerability.

Recommended defensive actions

• Verify Linux kernel versions and apply patches as necessary
• Monitor Linux kernel updates for potential fixes
• Review system configurations for potential exposure
• 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 CVE Program record and NVD vulnerability detail provide information on the vulnerability. Linux kernel versions 5.6 and later are affected. The vulnerability has been resolved in later Linux kernel versions. Defenders should verify Linux kernel versions and apply patches as necessary to prevent potential response consumption. The issue is caused by a race condition in the wireguard: noise component.

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.