Bug 2468244 (CVE-2026-43370)

Summary: CVE-2026-43370 kernel: drm/amdgpu: Fix use-after-free race in VM acquire
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's AMD GPU (amdgpu) driver. This vulnerability involves a timing issue, known as a race condition, during the process of acquiring a Virtual Machine (VM). When multiple processes attempt to access the same VM simultaneously, a local attacker could exploit this flaw. Successful exploitation could lead to an escalation of privileges, allowing unauthorized access or control, or cause the system to become unstable and crash (denial of service).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-05-08 15:06:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Fix use-after-free race in VM acquire

Replace non-atomic vm->process_info assignment with cmpxchg()
to prevent race when parent/child processes sharing a drm_file
both try to acquire the same VM after fork().

(cherry picked from commit c7c573275ec20db05be769288a3e3bb2250ec618)
Comment 1 Alexander B 2026-05-08 16:41:48 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050829-CVE-2026-43370-4d49@gregkh/T