CVE-2026-68447: drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
In the Linux kernel, the following vulnerability has been resolved:
drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
CRIU checkpoint copies the MQD control stack using cphqdcntlstacksize from hardware without bounding it to the allocated BO region. If the HW field is larger than the queue's control stack allocation, memcpy reads past the BO into adjacent GTT memory and can leak kernel data to userspace.
Store the page-aligned control stack BO size in mqdmanager and clamp checkpoint copies and reported checkpoint sizes to min(cphqdcntlstacksize, mm->ctlstacksize). Apply the same bound for multi-XCC v9.4.3 checkpoint layout.
(cherry picked from commit 6c2abd0ec09e86c6323010673766f76050e28aa3)
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Linux kernelto a version that resolves this vulnerability.Fixed in v9.4.3Patch drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
Event History
Frequently Asked Questions
What is the severity of CVE-2026-68447?
CVE-2026-68447 has a risk score of 37, indicating a moderate severity level.
How do I fix CVE-2026-68447?
To fix CVE-2026-68447, update your Linux kernel to the latest version where the vulnerability is patched.
What systems are affected by CVE-2026-68447?
CVE-2026-68447 affects systems running the Linux kernel that utilize the drm/amdkfd component.
What type of vulnerability is CVE-2026-68447?
CVE-2026-68447 is related to improper bounds checking during the checkpoint copying process in the Linux kernel.
Is CVE-2026-68447 a remote or local vulnerability?
CVE-2026-68447 is primarily considered a local vulnerability, as it requires access to the system to exploit.