CVE-2026-53164

Service interruption via corrupted IOMMU unwind

Published Jun 25, 2026 · Updated Jun 25, 2026

Denial of service in the IOMMU DMA subsystem in Linux Kernel allows local users to trigger a kernel warning via unaligned DMA mappings. The iommu_dma_iova_link_swiotlb() path passes a zero-length middle segment to iommu_map(), then starts error unwinding at zero rather than the segment offset and corrupts the mapping. Reachability requires locally initiated I/O with forced SWIOTLB and an unaligned buffer, as observed with some Thunderbolt NVMe passthrough commands; service interruption occurs when warning policy turns WARN_ON into a panic.

CVSS severity5.5
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the IOMMU DMA subsystem in Linux Kernel allows local users to trigger a kernel warning via unaligned DMA mappings. The iommu_dma_iova_link_swiotlb() path passes a zero-length middle segment to iommu_map(), then starts error unwinding at zero rather than the segment offset and corrupts the mapping. Reachability requires locally initiated I/O with forced SWIOTLB and an unaligned buffer, as observed with some Thunderbolt NVMe passthrough commands; service interruption occurs when warning policy turns WARN_ON into a panic.

The record

CVE
CVE-2026-53164
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=433a76207dcf5facc0183acb790f6e8398585258 <6ec91df8aff77e2e8fe3179c1f3fc15b43a40ba3
  2. Affected versionversion=433a76207dcf5facc0183acb790f6e8398585258 <ab61c990a87d084f5565ee70340543e3a5394697
  3. Affected versionversion=433a76207dcf5facc0183acb790f6e8398585258 <b16f8d40bac9ced838d24c9842707af9ecae92e2
  4. Affected versionversion=6.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=433a76207dcf5facc0183acb790f6e8398585258 <6ec91df8aff77e2e8fe3179c1f3fc15b43a40ba3; version=433a76207dcf5facc0183acb790f6e8398585258 <ab61c990a87d084f5565ee70340543e3a5394697; version=433a76207dcf5facc0183acb790f6e8398585258 <b16f8d40bac9ced838d24c9842707af9ecae92e2; version=6.16

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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