CVE-2026-64192 Linux CVE debrief

Who should care

System administrators and users running Linux kernels with BPF LSM enabled but not explicitly initialized should be aware of this vulnerability and take necessary precautions to verify their kernel configurations and BPF LSM initialization. This includes reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and planning vendor-supported updates or mitigations through normal change control where exposure is confirmed. Users should also review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant monitoring, detection, and logs for exposed assets that need extra review. Additionally, users should track exceptions, retest remediated assets, and close the item only after evidence is documented. The vulnerability may impact systems using the Linux kernel with BPF LSM enabled but not explicitly initialized, and users should take necessary precautions to mitigate this vulnerability. This may involve verifying Linux kernel configurations for BPF LSM initialization, ensuring BPF LSM is explicitly enabled at boot time if CONFIG_BPF_LSM=y is set, and monitoring for updates from the Linux kernel community regarding this vulnerability. Users should also consider the operational impact of this vulnerability and review the context of this vulnerability to understand its potential effects on their systems. Furthermore, users should be aware of the potential for kernel panic and take steps to mitigate this risk. By taking these precautions, users can help prevent exploitation of this vulnerability and minimize its potential impact on their systems. It is essential for users to prioritize this vulnerability and take necessary actions to ensure the security and integrity of their systems. Users should also consider implementing compensating controls, such as monitoring and detection, to help identify and respond to potential security incidents related to this vulnerability. Overall, users should take a proactive and multi-faceted approach to addressing this vulnerability and minimizing its potential impact on their systems. By doing so, users can help ensure the security

Technical summary

The vulnerability arises from the BPF LSM not being explicitly enabled at boot time when CONFIG_BPF_LSM=y is set. This leads to an uninitialized BPF inode security blob offset, causing issues with BPF_MAP_TYPE_INODE_STORAGE map creation and updates, potentially resulting in a kernel panic. The BPF LSM is not explicitly enabled at boot time, and users should verify their kernel configurations and BPF LSM initialization to mitigate this vulnerability.

Defensive priority

This vulnerability may impact systems using the Linux kernel with BPF LSM enabled but not explicitly initialized. Users should verify their kernel configurations and BPF LSM initialization.

Recommended defensive actions

• Verify Linux kernel configurations for BPF LSM initialization.
• Ensure BPF LSM is explicitly enabled at boot time if CONFIG_BPF_LSM=y is set.
• Monitor for updates from the Linux kernel community regarding this vulnerability.
• 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 is related to a vulnerability in the Linux kernel's BPF LSM. When CONFIG_BPF_LSM=y is set but the BPF LSM is not explicitly enabled at boot time, it leads to an uninitialized BPF inode security blob offset. This causes issues when creating and updating BPF_MAP_TYPE_INODE_STORAGE maps, potentially leading to a kernel panic.

Official resources