CVE-2022-26358

Host service interruption via broken IOMMU mappings

Published Apr 5, 2022 · Updated Aug 3, 2024

Improper IOMMU mapping handling in Xen allows guest OS users to trigger IOMMU faults or memory corruption through passed-through PCI devices. Xen fails to keep Intel VT-d RMRR or AMD-Vi unity-map regions continuously accessible after activating an associated device, allowing later DMA or interrupts to reach an invalid mapping state. Exploitation requires an x86 guest with a physical device assigned and an active IOMMU; the result is system-specific, with host-wide service interruption identified as the expected outcome.

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

What happened

Improper IOMMU mapping handling in Xen allows guest OS users to trigger IOMMU faults or memory corruption through passed-through PCI devices. Xen fails to keep Intel VT-d RMRR or AMD-Vi unity-map regions continuously accessible after activating an associated device, allowing later DMA or interrupts to reach an invalid mapping state. Exploitation requires an x86 guest with a physical device assigned and an active IOMMU; the result is system-specific, with host-wide service interruption identified as the expected outcome.

The record

CVE
CVE-2022-26358
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

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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

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

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.

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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

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Your stack

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