CVE-2026-89463 Linux CVE debrief

Who should care

Linux system administrators and users, kernel developers, and security teams should assess exposure and prioritize patching. The vulnerability affects Linux systems using the affected driver. Users should review and apply the patch provided by the Linux kernel maintainers. The vulnerability can potentially lead to a denial of service or code execution.

Why it matters

A use-after-free vulnerability in the Linux kernel's power: supply: ucs1002 driver requires patching and verification of affected systems.

• Potential denial of service due to use-after-free memory access.
• Possible code execution if an attacker can trigger the health_poll delayed work.
• Requires verification of affected systems and kernel versions.
• Patching priority for Linux systems using the affected driver.

Technical summary

The Linux kernel's power: supply: ucs1002 driver has a use-after-free vulnerability. When the driver is removed, the health_poll delayed work is not properly cancelled, allowing it to access freed memory. This can potentially lead to a denial of service or code execution. The vulnerability was found by an in-house static analysis tool. The CVE record and NVD entry provide details on the vulnerability, but do not provide information on exploitation or affected systems. Linux system administrators and users, kernel developers, and security teams should assess exposure and prioritize patching.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch provided by the Linux kernel maintainers.
• Inventory Linux systems using the affected driver and prioritize patching.
• Monitor system logs for potential exploitation attempts.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• 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.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

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 do not provide information on exploitation or affected systems. There is no information on whether the vulnerability has been exploited in the wild. The Linux kernel maintainers have provided a patch to fix the vulnerability. Users should review and apply the patch provided by the Linux kernel maintainers. The vulnerability affects Linux systems using the affected driver.

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.