CVE-2026-97524 Linux CVE debrief

Who should care

Linux kernel maintainers, Linux system administrators, and security teams responsible for patching and vulnerability management. These stakeholders should verify Linux kernel versions for potential exposure, assess and prioritize patching for affected systems, and monitor for updates from Linux kernel maintainers to ensure the security and stability of their systems.

Why it matters

CVE-2026-97524 is a Linux kernel vulnerability that requires verification of kernel versions and patching of affected systems to prevent potential exposure.

• Verify Linux kernel versions for potential exposure
• Assess and prioritize patching for affected systems
• Monitor for updates from Linux kernel maintainers

Technical summary

The Linux kernel vulnerability (CVE-2026-97524) was resolved by adding a new flag to exit early in subflow_state_change() and explicitly flushing the RX queue at reset time. This fix prevents unneeded processing and potential recursive calls in the mptcp receive path, improving the stability and security of the Linux kernel. The change addresses a specific error condition that could lead to recursive calls in the mptcp receive path, enhancing the overall security posture of the Linux kernel by mitigating this vulnerability.

Defensive priority

Verify Linux kernel versions and assess exposure; prioritize patching for affected systems.

Recommended defensive actions

• Verify Linux kernel versions for potential exposure
• Assess and patch affected systems
• Monitor for updates from Linux kernel maintainers
• Review compensating controls for exposed systems
• Check relevant monitoring, detection, and logs for exposed assets
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details on the Linux kernel vulnerability and its resolution. The fix involves adding a new flag to prevent recursive calls in the mptcp receive path. This change was made to address a specific error condition that could lead to unneeded actions on subflow reset. The resolution aims to improve the stability and security of the Linux kernel by preventing potential recursive calls and unneeded processing.

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.