CVE-2026-68447 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution maintainers, and users of the Linux kernel should assess exposure and apply patches or verify versions to mitigate the vulnerability. Affected operators, platforms, and security teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through normal change control where

Why it matters

The vulnerability in the Linux kernel's drm/amdkfd component can lead to kernel data leakage to userspace. Linux kernel developers and maintainers, Linux distribution maintainers, and users of the Linux kernel should assess exposure and apply patches or verify versions to mitigate the vulnerability.

• Data leakage from kernel to userspace
• Potential for sensitive data exposure
• Need for patch application and version verification

Technical summary

The vulnerability exists in the drm/amdkfd component of the Linux kernel. The CRIU control stack checkpoint copy is not properly bounded to the allocated BO region, which can lead to kernel data being leaked to userspace. The vulnerability is caused by a missing bounds check in the cp_hqd_cntl_stack_size field. This field is used to copy the MQD control stack using cp_hqd_cntl_stack_size from hardware without bounding it to the allocated BO region. As a result, memcpy reads past the BO into adjacent GTT memory and can leak kernel data to userspace.

Defensive priority

High

Recommended defensive actions

• Review and apply the provided patches to the Linux kernel
• Verify the version of the Linux kernel and ensure it is not affected
• Monitor the Linux kernel for any related security advisories
• 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 source item provide details on the vulnerability, including its description and affected versions. However, the corpus does not establish versions, exploitation, impact, or remediation beyond what is provided.

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.