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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2023-20585

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

No exploitation reported by the sources we read.

  • Published2026-04-16
  • WeaknessCWE-788

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-04-1619:16CVE publishedNVD

Versions per branch

Products declared by the CNA4 products

As AMD, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • AMD EPYC™ 7003 Series Processorsother versions: affected

    Not affected = SEV FW 1.37.23

  • AMD EPYC™ 9004 Series Processorsother versions: affected

    Not affected = SEV FW 1.37.31

  • AMD EPYC™ Embedded 7003 Series Processorsother versions: affected

    Not affected = EmbMilanPI-SP3 1.0.0.B

  • AMD EPYC™ Embedded 9004 Series Processorsother versions: affected

    Not affected = EmbGenoaPI-1.0.0.A

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-04-16

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • amd64-microcodeUbuntu:26.10all versions · no fixed version listed
  • kernel-64kbSUSE:Linux Enterprise Server for SAP applications 16.0all versions · fixed in 6.12.0-160000.34.1and 8 other packages
  • kernel-64kbSUSE:Linux Enterprise Server 16.0all versions · fixed in 6.12.0-160000.34.1and 8 other packages
  • kernel-64kbSUSE:Linux Enterprise Module for Basesystem 15 SP7all versions · fixed in 6.4.0-150700.53.55.1and 3 other packages
  • kernel-64kbSUSE:Linux Enterprise Module for Basesystem 15 SP7all versions · fixed in 6.4.0-150700.53.73.2and 2 other packages
  • kernel-azureSUSE:Linux Enterprise Module for Public Cloud 15 SP7all versions · fixed in 6.4.0-150700.53.55.1
  • kernel-azureSUSE:Linux Enterprise Module for Public Cloud 15 SP7all versions · fixed in 6.4.0-150700.53.73.2
  • kernel-defaultSUSE:Linux Enterprise Workstation Extension 15 SP7all versions · fixed in 6.4.0-150700.53.55.1

68 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-20585 Red Hat Product Security156 known affected

    kernel-core: hw: amd: AMD-SN-3016: IOMMU Write Buffer Vulnerability

    kernel.src as a component of Red Hat Enterprise Linux 10 · bpftool as a component of Red Hat Enterprise Linux 8 · kernel as a component of Red Hat Enterprise Linux 8 · +153 more

Full record on NVD

Fix

  1. No fix available, says the vendor Red Hat Product Security CVE-2023-20585 · 48 productsFix deferred
  2. No fix planned, says the vendor Red Hat Product Security CVE-2023-20585 · 108 productsWill not fix

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C
CVSS 4.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-04-16
Last Modified
2026-10-28
NVD status
Awaiting Analysis
MSRC Title
AMD: CVE-2023-20585 IOMMU Write Buffer Vulnerability
GitHub Advisory
GHSA-c43c-pr38-m5g2

Frequently asked questions

What is CVE-2023-20585?

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.

Is CVE-2023-20585 actively exploited?

Active exploitation of CVE-2023-20585 has not been confirmed. Its EPSS score was 0.10% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-20585?

CVE-2023-20585 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:H/A:N/E:U/RL:O/RC:C.

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