CVE-2026-90144 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, as well as users of Linux-based systems, should be aware of this vulnerability and take steps to apply the provided patches and ensure their systems are up-to-date.

Why it matters

This vulnerability in the Linux kernel's dpll device operations can cause system crashes and potentially lead to denial-of-service attacks. Linux kernel developers and users should apply patches and update their systems to mitigate this issue.

• Potential system crashes due to NULL pointer dereference
• Increased risk of denial-of-service (DoS) attacks
• Need for patching and updating Linux kernel versions

Technical summary

The Linux kernel's dpll device operations are vulnerable to a NULL pointer dereference during teardown. This occurs when the last owner of a dpll device unregisters while a foreign driver still holds a pin on it, causing the dpll object to remain alive with an empty registration list. The WARN_ON and NULL dereference in dpll_device_ops() can lead to a system crash. Affected Linux kernel developers and users should apply patches and update their systems to mitigate this issue, reviewing system configurations and monitoring logs for potential security threats.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to fix the NULL pointer dereference issue
• Ensure that the Linux kernel is updated to a version that includes the fix
• Monitor system logs for potential crashes or errors related to dpll device operations
• Perform a thorough review of the system configuration to identify potential vulnerabilities
• Implement compensating controls to mitigate the risk of denial-of-service attacks
• Conduct regular security audits to detect and address potential issues
• Track and analyze system performance to identify potential security threats

Evidence notes

The CVE record and source item provide details on the vulnerability, including its description and affected versions. However, the CVSS score and severity are not provided. The NVD entry is currently unconfirmed.

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.