CVE-2026-93178 Linux CVE debrief

Who should care

Linux system administrators and security teams should assess exposure and verify system configurations. Operators of Linux-based systems, especially those using the affected kernel versions, need to prioritize patching or mitigating this vulnerability to prevent potential system instability or denial of service. Security teams should review system configurations and ensure that patches or mitigations are applied promptly.

Why it matters

A bounds-checking vulnerability in the Linux kernel's drm/amdgpu/pm/powerplay requires verification of system exposure and prompt patching or mitigation to prevent potential system instability or denial of service.

• Potential system instability or denial of service
• Need for verification of system configurations and exposure
• Priority for patching or mitigating vulnerable systems

Technical summary

The Linux kernel's drm/amdgpu/pm/powerplay does not perform bounds checking on vddInd and vddcInd fields from VBIOS-parsed tables when indexing into voltage lookup tables. This could lead to system instability if invalid indices are used. The vulnerability arises from the use of these fields to index into voltage lookup tables without a bounds check, potentially causing denial of service or system instability if exploited. Affected systems require verification of exposure and prompt patching or mitigation to prevent potential impacts.

Defensive priority

Medium

Recommended defensive actions

• Review Linux kernel updates for patched versions
• Verify system configurations for exposure
• Monitor system stability and performance
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. However, the scope of affected systems and potential impact require further verification from official Linux kernel sources. Affected Linux kernel versions and configurations need to be assessed for exposure. Defenders should verify system configurations and apply patches or mitigations as needed. The vulnerability's impact on system stability and potential denial of service necessitates prompt attention.

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.