CVE-2026-98758 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems should assess exposure and prioritize patching. Linux kernel developers, maintainers, and users should prioritize patching and monitoring to prevent exploitation. Operators managing Linux-based systems, platform administrators, vulnerability management teams, and security teams should review the vulnerability and plan for mitigation.

Why it matters

A use-after-free vulnerability in the Linux kernel's USB type-C UCSI glink driver can cause system crashes or potentially allow attackers to execute arbitrary code. Linux kernel developers, maintainers, and users should prioritize patching and monitoring to prevent exploitation.

• Verify Linux kernel versions and apply patches to prevent potential use-after-free errors
• Monitor Linux kernel updates for future security patches to ensure continued protection
• Implement additional security measures to protect against potential exploitation, such as SELinux or other Mandatory Access Control systems

Technical summary

The Linux kernel's USB type-C UCSI glink driver has a use-after-free vulnerability. When the pmic_glink client is released, its notification callbacks can queue work that touches freed state, causing a use-after-free error. The vulnerability was fixed by disabling work items with disable_work_sync() before unregistering and only unregistering if the instance is still registered. This issue was found by an in-house static analysis tool. The CVE record and NVD entry provide details about the vulnerability, but there is limited information about affected systems or exploitation. Affected Linux kernel developers and maintainers should assess exposure and prioritize patching.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel
• Monitor Linux kernel updates for future security patches
• Consider implementing additional security measures to protect against potential exploitation
• Verify Linux kernel versions and apply patches to prevent potential use-after-free errors
• Monitor Linux kernel updates for future security patches to ensure continued protection
• Implement additional security measures to protect against potential exploitation, such as SELinux or other Mandatory Access Control systems
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The vulnerability was found by an in-house static analysis tool. The CVE record and NVD entry provide details about the vulnerability, but there is limited information about affected systems or exploitation.

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.