CVE-2026-89466 Linux CVE debrief

Who should care

Linux system administrators, developers, and users of Linux-based systems should assess exposure and apply patches. They should also review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. Additionally, they should plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. Linux-based system users may be impacted if their systems are affected by the vulnerability.

Why it matters

A Linux kernel vulnerability in power: supply: qcom_battmgr requires verification and patch application to prevent potential buffer overflows. Linux system administrators and developers should assess exposure.

• Potential buffer overflow when reading strings in user space
• Need to verify and apply patches for Linux kernel power: supply: qcom_battmgr
• Possible exposure in Linux-based systems

Technical summary

The qcom_battmgr_sc8280xp_strcpy() function in the Linux kernel did not properly terminate strings from firmware. This could cause a buffer overflow when reading strings in user space. The issue has been resolved by using strscpy() to ensure proper termination. Affected Linux system administrators and developers should assess exposure and apply patches to prevent potential security issues. The vulnerability could lead to unexpected behavior or crashes in affected systems if not mitigated properly. To prevent buffer overflows, it is essential to verify and apply patches for the Linux kernel power: supply: qcom_battmgr.

Defensive priority

Verify and apply patches for Linux kernel power: supply: qcom_battmgr, assess exposure in Linux-based systems.

Recommended defensive actions

• Verify Linux kernel version and assess exposure
• Apply patches for power: supply: qcom_battmgr
• Monitor Linux-based systems for potential buffer overflow 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 CVE record and NVD entry provide details on the Linux kernel vulnerability. However, the corpus does not establish versions, exploitation, impact, or remediation beyond patch application. To verify and apply patches, Linux system administrators and developers should review the official advisory and CVE record. They should also assess exposure in Linux-based systems and monitor for potential buffer overflow attempts. The qcom_battmgr_sc8280xp_strcpy() function's improper string termination could lead to security issues if not mitig

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.