CVE-2026-31563 Linux CVE debrief

Who should care

Users of Linux kernel versions 6.1.151 to 6.1.168, 6.6.105 to 6.6.131, 6.12.46 to 6.12.80, 6.16.6 to 6.17, 6.17.1 to 6.18.21, 6.19 to 6.19.11, and 7.0 rc1 to rc7 should be aware of this vulnerability and take necessary actions to mitigate it. System administrators and security teams responsible for Linux kernel-based systems should prioritize patching affected versions.

Technical summary

The vulnerability is caused by the improper use of napi_consume_skb() in an IRQ-disabled context in the macb driver, which can lead to a system crash or denial of service. This issue was resolved by replacing napi_consume_skb() with dev_consume_skb_any() for freeing TX SKBs. Affected users should apply patches from Linux kernel stable branches to mitigate this vulnerability. The vulnerability affects Linux kernel versions 6.1.151 to 6.1.168, 6.6.105 to 6.6.131, 6.12.46 to 6.12.80, 6.16.6 to 6.17, 6.17.1 to 6.18.21, 6.19 to 6.19.11, and 7.0 rc1 to rc7.

Defensive priority

High priority should be given to patching affected Linux kernel versions, as the vulnerability can lead to a system crash or denial of service. System administrators should inventory and check for affected Linux kernel versions, apply patches from Linux kernel stable branches, monitor system logs for potential denial of service attempts, and consider implementing compensating controls, such as network segmentation or access controls. Additionally, tracking exceptions, retesting remediated assets, and closing the item only after evidence is documented are crucial steps in mitigating this vulnerability. Regularly reviewing relevant monitoring, detection, and logs for exposed assets that need extra review is also recommended. Implementing a robust vulnerability management process and ensuring that security teams are aware of the potential impacts are essential defensive measures. Lastly, confirming whether affected product deployments exist in managed environments and assigning an owner for follow-up is vital for effective remediation. This should be done while considering compensating controls for exposed systems during remediation and verification phases. Monitoring for potential denial-of-service attempts and having a plan in place for quick response can significantly mitigate the risk associated with this vulnerability. Therefore, it is crucial to treat this vulnerability with high priority and take immediate action to secure affected systems. The implementation of these measures will help in reducing the risk of exploitation and potential system downtime. By taking these steps, organizations can enhance their security posture and protect their Linux kernel-based systems from potential attacks. It is also essential to stay informed about any updates or additional guidance provided by the Linux kernel community regarding this vulnerability. This will ensure that organizations can adapt their security strategies as needed to address any evolving threats. In conclusion, a proactive and comprehensive approach to addressing this vulnerability is necessary to minimize potential risks and ensure the security and stability of Linux kernel-based systems. By prioritizing

Recommended defensive actions

• Inventory and check for affected Linux kernel versions
• Apply patches from Linux kernel stable branches
• Monitor system logs for potential denial of service attempts
• Consider implementing compensating controls, such as network segmentation or access controls
• 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

Evidence notes

The CVE record was published on 2026-04-24T15:16:30.720Z and last modified on 2026-07-14T13:18:45.660Z. The NVD entry is currently Modified. This vulnerability affects Linux kernel versions 6.1.151 to 6.1.168, 6.6.105 to 6.6.131, 6.12.46 to 6.12.80, 6.16.6 to 6.17, 6.17.1 to 6.18.21, 6.19 to 6.19.11, and 7.0 rc1 to rc7. Users should verify their system configurations and check for patches or updates from the Linux kernel community.

Official resources