CVE-2026-89465 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems that utilize the rt9455 power supply driver should assess exposure and apply the patch or update to a fixed version.

Why it matters

A use-after-free vulnerability in the Linux kernel's rt9455 power supply driver can lead to system instability or potential exploitation. Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems that utilize the rt9455 power supply driver should assess exposure and apply the patch or update to a fixed version.

• Verify that the Linux kernel is updated to a version that includes the fix
• Monitor system logs for potential exploitation attempts
• Review system configurations to ensure that the rt9455 power supply driver is properly configured and secured

Technical summary

The Linux kernel's rt9455 power supply driver has a use-after-free vulnerability. The driver's threaded IRQ handler can queue delayed work, which can lead to a use-after-free condition when the driver is removed or encounters an error during initialization. The vulnerability was found by an in-house static analysis tool. The CVE record and NVD entry provide details on the vulnerability, but no additional information on exploitation or impact is available. The vulnerability can cause system instability or potential exploitation. Linux kernel developers and maintainers, Linux distribution maintainers, and users of Linux-based systems that utilize the rt9455 power supply driver should assess exposure and apply the

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch provided by the Linux kernel maintainers
• Ensure that the Linux kernel is updated to a version that includes the fix
• Monitor system logs for potential exploitation attempts
• Verify that the Linux kernel is updated to a version that includes the fix
• Review system configurations to ensure that the rt9455 power supply driver is properly configured and secured
• 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.

Evidence notes

The vulnerability was found by an in-house static analysis tool. The CVE record and NVD entry provide details on the vulnerability, but no additional information on exploitation or impact is available.

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.