CVE-2026-89804Hinoki check available

IOMMU mapping leak via undersized DMA unmaps

Published Sep 16, 2026 · Updated Sep 16, 2026

Resource leak in the Linux kernel 6.19 allows attackers to exhaust IOMMU/IOVA mappings through Nouveau device-private THP migration. The nouveau_dmem_migrate_to_ram success path and nouveau_dmem_migrate_copy_one error path unmap only PAGE_SIZE instead of the recorded mapping size. Triggering requires migration of an order-greater-than-zero compound folio; each event leaves part of the DMA mapping allocated.

CVSS severityUnavailable
Unscored
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Resource leak in the Linux kernel 6.19 allows attackers to exhaust IOMMU/IOVA mappings through Nouveau device-private THP migration. The nouveau_dmem_migrate_to_ram success path and nouveau_dmem_migrate_copy_one error path unmap only PAGE_SIZE instead of the recorded mapping size. Triggering requires migration of an order-greater-than-zero compound folio; each event leaves part of the DMA mapping allocated.

The record

CVE
CVE-2026-89804
Published
Sep 16, 2026
Updated
Sep 16, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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?

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  1. Affected versionversion=6.19
  2. Affected versionversion=c3228747107705d47c7e9a03598a434a0380cb73 <4deb29b9d33bfdb3de4d2d9944947ecf77221e42
  3. Affected versionversion=c3228747107705d47c7e9a03598a434a0380cb73 <caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=c3228747107705d47c7e9a03598a434a0380cb73 <4deb29b9d33bfdb3de4d2d9944947ecf77221e42; version=c3228747107705d47c7e9a03598a434a0380cb73 <caa1bc2a0a6ca19dcb90bbf88208b0fe2decd66f

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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