CVE-2022-26359

Host denial of service via inaccessible IOMMU mappings

Published Apr 5, 2022 · Updated Aug 3, 2024

IOMMU mapping errors in Xen allow guest OS users to cause host-wide service interruption through DMA or interrupts from a PCI device. Xen fails to keep Intel VT-d reserved-memory or AMD-Vi unity-map regions continuously accessible after the associated device becomes active. Exploitation requires an x86 guest with a physical device passed through, active IOMMU hardware, and an RMRR or unity map; outcomes range from IOMMU faults to host memory corruption.

CVSS severity7.8
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

IOMMU mapping errors in Xen allow guest OS users to cause host-wide service interruption through DMA or interrupts from a PCI device. Xen fails to keep Intel VT-d reserved-memory or AMD-Vi unity-map regions continuously accessible after the associated device becomes active. Exploitation requires an x86 guest with a physical device passed through, active IOMMU hardware, and an RMRR or unity map; outcomes range from IOMMU faults to host memory corruption.

The record

CVE
CVE-2022-26359
Published
Apr 5, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 5, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4NIST NVDAV:L/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo