CVE-2025-68760

MMIO data disclosure via undersized boundary check

Published Jan 5, 2026 · Updated Jan 5, 2026

Out-of-bounds read in the AMD IOMMU debugfs handler in Linux Kernel 6.17 through 6.18.1 allows local users to disclose MMIO data. iommu_mmio_write accepts an offset validated for four bytes, while iommu_mmio_show passes that offset to readq for an eight-byte read. The mmio debugfs file is mode 0644, so setting the crafted offset requires root-equivalent access; the overread extends four bytes past mapped MMIO.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the AMD IOMMU debugfs handler in Linux Kernel 6.17 through 6.18.1 allows local users to disclose MMIO data. iommu_mmio_write accepts an offset validated for four bytes, while iommu_mmio_show passes that offset to readq for an eight-byte read. The mmio debugfs file is mode 0644, so setting the crafted offset requires root-equivalent access; the overread extends four bytes past mapped MMIO.

The record

CVE
CVE-2025-68760
Published
Jan 5, 2026
Updated
Jan 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 5, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 5, 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=6.17
  2. Affected versionversion=7a4ee419e8c144b747a8915856e91a034d7c8f34 <0ec4aaf5f3f559716a6559f3d6d9616e9470bed6
  3. Affected versionversion=7a4ee419e8c144b747a8915856e91a034d7c8f34 <a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7
  4. Affected versionversion=7a4ee419e8c144b747a8915856e91a034d7c8f34 <b959df804c33913dbfdb90750f2d693502b3d126

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=7a4ee419e8c144b747a8915856e91a034d7c8f34 <0ec4aaf5f3f559716a6559f3d6d9616e9470bed6; version=7a4ee419e8c144b747a8915856e91a034d7c8f34 <a0c7005333f9a968abb058b1d77bbcd7fb7fd1e7; version=7a4ee419e8c144b747a8915856e91a034d7c8f34 <b959df804c33913dbfdb90750f2d693502b3d126

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)
Vectorlocal
Privilegesadmin
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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