CVE-2026-43298 Linux CVE debrief

Who should care

Linux kernel maintainers, users of AMD GPUs with VFs, and system administrators responsible for kernel updates and monitoring should be aware of this vulnerability. They should review and apply patches or update kernel versions to prevent potential system instability. Additionally, they should monitor system logs for potential call traces during deinitialization and implement compensating controls for exposed systems.

Why it matters

CVE-2026-43298 is a medium-severity vulnerability in the Linux kernel's drm/amdgpu module. It requires attention from Linux kernel maintainers and users, especially those using AMD GPUs with VFs, to apply patches or update kernel versions to prevent potential system instability.

• Potential system crashes or instability due to call traces during deinitialization
• Need for kernel updates to prevent potential issues
• Monitoring system logs for call traces related to VCN poison IRQ release

Technical summary

The vulnerability is in the drm/amdgpu module of the Linux kernel. It causes a call trace during deinitialization when VCN poison IRQ is released on Virtual Functions (VFs). The fix involves skipping the release of VCN poison IRQ on VFs. This vulnerability has a medium severity level and requires attention from Linux kernel maintainers and users, especially those using AMD GPUs with VFs. The vulnerability can be addressed by updating the Linux kernel to versions 6.18.16 or later, or 6.19.6 or later. The fix prevents potential system instability by addressing the call trace issue during deinitialization processes.

Defensive priority

Medium priority for Linux kernel maintainers and users, especially those using AMD GPUs with VFs.

Recommended defensive actions

• Review and apply patches from Linux kernel maintainers for affected versions
• Update Linux kernel to versions 6.18.16 or later, or 6.19.6 or later
• Monitor system logs for potential call traces during deinitialization
• Perform a thorough review of system configurations and kernel versions to identify potential exposure
• Verify that system administrators are aware of the vulnerability and its potential impacts
• Implement compensating controls for exposed systems while remediation is scheduled and verified
• Track exceptions and retest remediated assets to ensure the vulnerability is properly addressed

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description, CVSS score, and affected kernel versions. The vulnerability has been resolved in Linux kernel versions 6.18.16 and later, or 6.19.6 and later. Users should review and apply patches from Linux kernel maintainers for affected versions. The NVD entry provides additional information on the vulnerability, including its CVSS score and affected kernel versions.

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.