CVE-2026-89475 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems that utilize the power: supply: bq24257 module should review and apply the provided patches to the Linux kernel. They should also ensure that the Linux kernel is updated to a version that includes the fix and monitor system logs for potential exploitation attempts.

Why it matters

This vulnerability requires attention from Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems that utilize the power: supply: bq24257 module. The vulnerability can lead to potential system crashes or instability and possible elevation of privileges or arbitrary code execution. However, evidence of exploitation is limited, and further verification is required to confirm the actual impact.

• Potential system crashes or instability due to use-after-free memory access
• Possible elevation of privileges or arbitrary code execution

Technical summary

The vulnerability is caused by the STAT-pin interrupt remaining armed after the remove() function is called, allowing a threaded handler to fire and reschedule work against freed memory. This was resolved by making the delayed work device-managed with devm_delayed_work_autocancel(). The fix ensures that the interrupt is released first, so the handler can no longer reschedule the work, and cancels the work before the memory is freed. Linux kernel developers and maintainers should review and apply the provided patches to the Linux kernel's power: supply: bq24257 module.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel's power: supply: bq24257 module
• Ensure that the Linux kernel is updated to a version that includes the fix
• 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 discovered through static analysis. The Linux kernel's power: supply: bq24257 module is affected. The STAT-pin interrupt remaining armed after the remove() function is called, allowing a threaded handler to fire and reschedule work against freed memory. Evidence of exploitation is limited, and further verification is required to confirm the actual impact. Defenders should verify the Linux kernel version and ensure that the fix is applied.

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.