CVE-2026-97925 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems should be aware of this vulnerability and take steps to ensure their systems are updated with the fix.

Why it matters

The Linux kernel's tick broadcast device replacement mechanism is vulnerable to a race condition, potentially leading to system crashes or code execution. Linux kernel developers, maintainers, and users should ensure their systems are updated with the fix to prevent exploitation.

• System crashes or instability due to use-after-free errors.
• Potential code execution or privilege escalation.
• Increased risk of denial-of-service (DoS) attacks.
• Need for verification of Linux kernel versions and patch application.

Technical summary

The Linux kernel's tick broadcast device replacement mechanism is vulnerable to a race condition, allowing for a use-after-free error. This can lead to a system crash or potentially execute arbitrary code. The issue arises when a broadcast device is replaced while a concurrent tick broadcast operation is in progress. The vulnerability has been resolved by serializing the tick_install_broadcast_device function with tick_broadcast_lock.

Defensive priority

High

Recommended defensive actions

• Review and apply the patch to the Linux kernel to prevent exploitation of the race condition vulnerability.
• Ensure that the Linux kernel is updated to a version that includes the fix for CVE-2026-97925.
• Monitor system logs for potential crashes or errors related to the tick broadcast device.
• Perform a thorough review of system configurations and kernel versions to identify potential exposure.
• Verify that compensating controls are in place for exposed systems while remediation is scheduled and verified.
• Track exceptions and retest remediated assets to ensure the vulnerability is fully resolved.
• Implement additional monitoring and detection measures to identify potential exploitation attempts.

Evidence notes

The CVE record and source references indicate a race condition vulnerability in the Linux kernel's tick broadcast device replacement mechanism. The issue allows for a use-after-free error, potentially leading to a system crash or code execution. The vulnerability has been resolved through a patch that serializes the tick_install_broadcast_device function.

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.