CVE-2026-68447 drm/amdkfd: clamp v9 CRIU control stack checkpoint copy to BO size
A local attacker can leak kernel data to userspace by triggering a CRIU checkpoint copy that reads past the allocated buffer in the AMD KFD driver.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-68447?
CVE-2026-68447 is a high-severity vulnerability in Linux, published on 12 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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 cp_hqd_cntl_stack_size 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 mqd_manager and clamp checkpoint copies and reported checkpoint sizes to min(cp_hqd_cntl_stack_size, mm->ctl_stack_size). Apply the same bound for multi-XCC v9.4.3 checkpoint layout.
(cherry picked from commit 6c2abd0ec09e86c6323010673766f76050e28aa3)
Weakness: CWE-125
Which versions are affected by CVE-2026-68447?
How do I fix CVE-2026-68447?
Apply the vendor's patch.
Is CVE-2026-68447 being exploited?
There is no known exploitation of CVE-2026-68447 in the wild and no public exploit code.
Sources
Also known as AZL-95519, BELL-CVE-2026-68447, DEBIAN-CVE-2026-68447, GHSA-m433-x9mx-qcj6, UBUNTU-CVE-2026-68447.