CVE-2026-89469

Received Received - Intake

Use-After-Free in Linux Kernel lp8727 Power Supply Driver

Publication date: 2026-09-11

Last updated on: 2026-09-14

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: lp8727: fix use-after-free in lp8727_release_irq() lp8727_isr_func(), the threaded IRQ handler, is the only caller that arms pchg->work via schedule_delayed_work(). lp8727_release_irq() currently cancels the work before freeing the IRQ, so an IRQ delivered in between can re-arm the work through the threaded handler. After .remove returns the devm layer frees pchg while lp8727_delayed_func() may still run and dereference it. Free the IRQ first so the threaded handler is quiesced and can no longer queue work, then cancel the delayed work to drain the final generation. This issue was found by an in-house static analysis tool.

CVSS Scores

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Meta Information

Published

2026-09-11

Last Modified

2026-09-14

Generated

2026-10-02

AI Q&A

2026-09-12

EPSS Evaluated

2026-09-29

NVD

CVE-2026-89469

EUVD

EUVD-2026-76375

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This is a use-after-free vulnerability in the Linux kernel's power supply subsystem, specifically in the lp8727 driver. The issue occurs when the IRQ handler lp8727_isr_func schedules delayed work, but lp8727_release_irq cancels the work before freeing the IRQ. An IRQ delivered in between can re-arm the work, leading to a use-after-free when the device is removed and the work function lp8727_delayed_func tries to access freed memory.

Detection Guidance

This vulnerability is specific to the Linux kernel's power supply subsystem (lp8727 driver) and does not have network-based detection methods. Detection requires checking kernel logs for crashes or errors related to the lp8727 driver or power supply subsystem.

Impact Analysis

This vulnerability could cause system instability or crashes if exploited. It may lead to arbitrary code execution with kernel privileges, allowing attackers to gain full control over the affected system. Systems using the lp8727 power supply driver are at risk.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards. It is a use-after-free issue in the Linux kernel's power supply subsystem, specifically in the lp8727 driver. The impact is limited to potential system instability or crashes due to improper memory handling, not data privacy or security breaches.

Mitigation Strategies

Update the Linux kernel to a patched version that includes the fix for CVE-2026-89469. The patch ensures proper IRQ handling and prevents the use-after-free issue in the lp8727 driver.

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