CVE-2026-99047 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, system administrators responsible for Linux kernel updates and security patches, and security teams responsible for monitoring and mitigating potential vulnerabilities. These individuals should review and update their systems to ensure they are secure and verify that XSK buffers are being properly freed when stopping rings.

Why it matters

A buffer leak vulnerability was found in the Linux kernel's gve module when stopping rings, potentially leading to resource exhaustion if exploited. Linux kernel developers and maintainers should review and update their systems to ensure they are secure.

• Potential resource exhaustion due to buffer leaks
• Need to verify Linux kernel versions and ensure they are up-to-date with the latest security patches
• Monitoring system logs for potential resource exhaustion issues

Technical summary

The Linux kernel's gve module has a buffer leak vulnerability when stopping rings. This issue was resolved by freeing XSK buffers attached to an allocated buf_state when stopping rings. The vulnerability was identified in the Linux kernel's gve module, which is responsible for managing network interfaces. The buffer leak occurs when the rings are stopped, causing the XSK buffers to be leaked, potentially leading to resource exhaustion. The resolution involves freeing the XSK buffers attached to an allocated buf_state when stopping rings.

Defensive priority

Medium

Recommended defensive actions

• Review Linux kernel versions and ensure they are up-to-date with the latest security patches
• Monitor system logs for potential resource exhaustion issues
• Verify that XSK buffers are being properly freed when stopping rings
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and source item provide details about the vulnerability and its resolution. However, there is limited information about potential exploitation or affected systems. The vulnerability was identified in the Linux kernel's gve module, and the resolution involves freeing XSK buffers attached to an allocated buf_state when stopping rings. Further review of Linux kernel versions and configurations is necessary to determine the extent of potential exposure.

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.