CVE-2026-68238 Linux CVE debrief

Who should care

Linux kernel users and administrators should be aware of this vulnerability and take steps to ensure their systems are updated with the fix. This includes verifying Linux kernel versions and configurations, reviewing system configurations for affected Linux kernel versions, and monitoring system logs for potential issues related to the amdgpu_acpi_vfct_bios() function. Additionally, security teams and vulnerability management teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance, and plan vendor-supported updates or mitigations through normal change control where exposure is confirmed. IT operators and platform administrators should also review compensating controls for exposed systems while remediation is scheduled and verified, and track exceptions, retest remediated assets, and close the item only after evidence is documented. Asset inventory managers should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Monitoring and detection teams should check relevant monitoring, detection, and logs for exposed assets that need extra review. Change management teams should plan and implement updates through normal change control processes. Source tracking and incident response teams should review the CVE record and vendor guidance to validate affected scope and severity, and plan for potential incidents related to this vulnerability. Security awareness and training teams should ensure that relevant personnel are aware of this vulnerability and its potential impact, and provide training on how to verify Linux kernel versions and configurations, and how to review system configurations for affected Linux kernel versions. Compliance and risk management teams should review the CVE record and vendor guidance to validate affected scope and severity, and assess potential compliance and risk implications of this vulnerability. Business continuity and disaster recovery teams should review the CVE record and vendor guidance to validate affected scope and severity, and assess potential business impact of this vulnerability. Public relations and external

Technical summary

The Linux kernel vulnerability involves a memory leak in the amdgpu_acpi_vfct_bios() function. It fetches the VFCT ACPI table with acpi_get_table() but never releases it, leading to a mapping leak on every call. A fix has been applied by routing all exit paths after the table is acquired through a common acpi_put_table(). The VBIOS image is copied out with kmemdup() before the table is released, so it remains valid for the caller. This fix ensures that the memory leak is resolved, and the system is no longer vulnerable to potential memory exhaustion.

Defensive priority

Linux kernel users should verify and apply available updates to mitigate potential memory leak issues.

Recommended defensive actions

• Verify Linux kernel versions and apply updates to ensure the fix is included
• Review system configurations for affected Linux kernel versions
• Monitor system logs for potential issues related to the amdgpu_acpi_vfct_bios() function
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The Linux kernel vulnerability involves a memory leak in the amdgpu_acpi_vfct_bios() function. It fetches the VFCT ACPI table with acpi_get_table() but never releases it, leading to a mapping leak on every call. A fix has been applied by routing all exit paths after the table is acquired through a common acpi_put_table(). Evidence of this vulnerability is limited, and defenders should verify Linux kernel versions and configurations to ensure the fix is included and monitor system logs for potential issues related to the amdgpu_acpi_vfct_bios() function.

Official resources