CVE-2026-31735

Host memory compromise via short IOMMU invalidation

Published May 1, 2026 · Updated May 1, 2026

IOMMU invalidation flaw in Linux Kernel 6.19 through 6.19.11 allows local users to retain device DMA access to unmapped host memory. The iommupt unmap path can remove an entire large or contiguous IOPTE when a request ends inside it, but the gather flushes only the requested range and leaves stale IOMMU translations. Exploitation requires local access to an iommufd/VFIO context backed by an IOMMU device domain; stale translations permit device DMA reads or writes after unmapping, exposing or corrupting host or tenant memory and potentially crashing or hanging the host.

CVSS severity8.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

IOMMU invalidation flaw in Linux Kernel 6.19 through 6.19.11 allows local users to retain device DMA access to unmapped host memory. The iommupt unmap path can remove an entire large or contiguous IOPTE when a request ends inside it, but the gather flushes only the requested range and leaves stale IOMMU translations. Exploitation requires local access to an iommufd/VFIO context backed by an IOMMU device domain; stale translations permit device DMA reads or writes after unmapping, exposing or corrupting host or tenant memory and potentially crashing or hanging the host.

The record

CVE
CVE-2026-31735
Published
May 1, 2026
Updated
May 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.19
  2. Affected versionversion=7c53f4238aa8bfb476e177263133ead2eeb8d55d <50ecd96a28f712f8b682c0441f4cb9b086d28816
  3. Affected versionversion=7c53f4238aa8bfb476e177263133ead2eeb8d55d <ee6e69d032550687a3422504bfca3f834c7b5061

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=7c53f4238aa8bfb476e177263133ead2eeb8d55d <50ecd96a28f712f8b682c0441f4cb9b086d28816; version=7c53f4238aa8bfb476e177263133ead2eeb8d55d <ee6e69d032550687a3422504bfca3f834c7b5061

Published CVSS scores

5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
8.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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

T1068Exploitation for Privilege Escalation

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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