CVE-2025-71118 Linux CVE debrief

Who should care

Linux kernel administrators and developers should assess exposure and apply patches to prevent potential NULL pointer dereferences. System operators and security teams responsible for Linux kernel deployments are also advised to review and apply patches. Additionally, individuals responsible for maintaining and securing Linux-based systems should be aware of this vulnerability and take necessary actions to mitigate potential risks.

Why it matters

Linux kernel administrators and developers should assess exposure and apply patches to prevent potential NULL pointer dereferences.

• Verify Linux kernel versions and apply patches to prevent potential NULL pointer dereferences
• Review system configurations to ensure patching and prevent exploitation
• Update Linux kernel versions to ensure patching and prevent potential issues

Technical summary

The Linux kernel vulnerability involves ACPICA and handling of the ACPI Namespace. A NULL pointer dereference could occur due to improper handling of the start_node variable. Patches are available to address this issue by moving the check of start_node being NULL out of the if block. Linux kernel administrators and developers should assess exposure and apply patches to prevent potential NULL pointer dereferences. The vulnerability was publicly disclosed and addressed through collaborative efforts between Linux kernel developers and system manufacturers.

Defensive priority

Apply patches to affected Linux kernel versions to prevent potential NULL pointer dereferences.

Recommended defensive actions

• Apply patches to affected Linux kernel versions
• Review and update Linux kernel versions to ensure patching
• Verify system configurations to prevent exploitation
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• 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

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability. Linux kernel patches are available to address the issue. The vulnerability involves ACPICA and handling of the ACPI Namespace, potentially leading to a NULL pointer dereference. Honor Magicbook 14 Pro systems with a bad DSDT table are affected. The issue was resolved by modifying the ACPICA code to properly handle the start_node variable.

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.