CVE-2023-20585

Insufficient RMP Checks in IOMMU Allow Host Buffer Out‑of‑Bounds Access

Published Apr 16, 2026 CVSS 4.0 · 5.6 Medium EPSS < 1% KEV · Not listed
Description
Insufficient checks of the RMP on host buffer access in IOMMU may allow an attacker with privileges and a compromised hypervisor to trigger an out of bounds condition without RMP checks, resulting in a potential loss of confidential guest integrity.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Ubuntu USN Ubuntu USN USN-8887-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8888-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-8889-1 Linux kernel (OEM) vulnerabilities
Ubuntu USN Ubuntu USN USN-8887-2 Linux kernel (AWS) vulnerabilities
Ubuntu USN Ubuntu USN USN-8888-2 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-8887-3 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8917-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-8918-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-9003-1 Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN Ubuntu USN USN-9024-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-9025-1 Linux kernel vulnerabilities
Ubuntu USN Ubuntu USN USN-9026-1 Linux kernel (Azure) vulnerabilities
Ubuntu USN Ubuntu USN USN-9040-1 Linux kernel (Low Latency NVIDIA) vulnerabilities
Ubuntu USN Ubuntu USN USN-9043-1 Linux kernel (NVIDIA) vulnerabilities
Ubuntu USN Ubuntu USN USN-9066-1 Linux kernel (HWE) vulnerabilities
Ubuntu USN Ubuntu USN USN-9091-1 Linux kernel (NVIDIA Tegra) vulnerabilities
History
Type Values Removed Values Added
First Time appeared Amd
Amd epyc 7003 Series Processors
Amd epyc 9004 Series Processors
Amd epyc Embedded 7003 Series Processors
Amd epyc Embedded 9004 Series Processors
Vendors & Products Amd
Amd epyc 7003 Series Processors
Amd epyc 9004 Series Processors
Amd epyc Embedded 7003 Series Processors
Amd epyc Embedded 9004 Series Processors
Type Values Removed Values Added
Title Insufficient RMP Checks in IOMMU Allow Host Buffer Out‑of‑Bounds Access
Type Values Removed Values Added
Description Insuffient checks of the RMP on host buffer access in IOMMU may allow an attacker with privileges and a compromised HV to trigger an out of bounds condition without RMP checks resulting in a potential loss of confidential guest integrity. Insufficient checks of the RMP on host buffer access in IOMMU may allow an attacker with privileges and a compromised hypervisor to trigger an out of bounds condition without RMP checks, resulting in a potential loss of confidential guest integrity.
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Insuffient checks of the RMP on host buffer access in IOMMU may allow an attacker with privileges and a compromised HV to trigger an out of bounds condition without RMP checks resulting in a potential loss of confidential guest integrity.
Weaknesses CWE-788
References
Metrics cvssV4_0

{'score': 5.6, 'vector': 'CVSS:4.0/AV:L/AC:H/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
AMD
Published
Updated
Apr 16, 2026, 7:12 PM
Reserved
Oct 27, 2022, 6:53 PM
Status
Awaiting Analysis
Published
Apr 16, 2026, 7:16 PM
Modified
Oct 28, 2026, 7:10 PM