CVE-2026-98953 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess their exposure to this vulnerability and apply patches as needed.

Why it matters

The Linux kernel's devlink component has a reference leak vulnerability that can be triggered by registering and unregistering a nested devlink instance while holding the parent lock. This vulnerability requires verification of Linux kernel versions and application of patches to prevent reference leaks.

• Verify Linux kernel versions and apply patches to prevent reference leaks
• Monitor system logs for potential exploitation attempts
• Implement additional logging and monitoring to detect potential issues

Technical summary

The Linux kernel's devlink component has a reference leak vulnerability when notify work is pending. This occurs due to the incorrect handling of devlink_rel references in devlink_rel_nested_in_notify_work_schedule(). The vulnerability can be triggered by registering and unregistering a nested devlink instance while holding the parent lock, leading to a reference leak. The issue can be exploited by an attacker to cause a denial of service or potentially execute arbitrary code. The CVE record and source item provide details on the affected versions and CVSS score.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to address the reference leak vulnerability
• Monitor Linux kernel versions for updates and apply patches as needed
• Consider implementing additional logging and monitoring to detect potential exploitation attempts
• Verify Linux kernel versions and apply patches to prevent reference leaks
• Monitor system logs for potential exploitation attempts
• Implement additional logging and monitoring to detect potential issues
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

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 vulnerability is caused by a reference leak in the Linux kernel's devlink component when notify work is pending. The issue can be triggered by registering and unregistering a nested devlink instance while holding the parent lock. The CVE Program record and NVD detail page provide additional information on the vulnerability. The source item provides details on

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.