Bug 2513145 (CVE-2026-68101)

Summary: CVE-2026-68101 kernel: drm/amdgpu: fix check in amdgpu_hmm_invalidate_gfx
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in the Linux kernel's AMD GPU (amdgpu) driver. During the allocation or deallocation of a user pointer buffer object, a critical reference to its virtual memory object can become unavailable. This improper handling of memory submissions could lead to system instability or a denial of service, making the system unresponsive.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-08-10 12:21:41 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: fix check in amdgpu_hmm_invalidate_gfx

For a short moment during alloc/free the userptr BO is not part of his VM,
so bo->vm_bo can be NULL.

Keep a reference to the VM root PD as parent of the userptr BO so that
we can always use that to wait for all submissions of the VM instead of
only the one involving the userptr BO.

(cherry picked from commit 631849ff5d603841e74f19f4a5e30fe1f7d7cf30)
Comment 1 gkamathe 2026-08-11 10:48:27 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081052-CVE-2026-68101-99a4@gregkh/T