CVE-2026-53283

Boot-time crash via unchecked AMD IOMMU device index

Published Jun 26, 2026 · Updated Jun 26, 2026

Out-of-bounds read in the AMD IOMMU subsystem in affected Linux Kernel releases allows local users to trigger a boot-time crash. __rlookup_amd_iommu() indexes rlookup_table with an unchecked PCI device identifier, after which check_device() dereferences adjacent slab data as an amd_iommu structure. The crash requires an AMD IOMMU configuration whose IVRS omits a device BDF and a tightly allocated lookup table, producing a general protection fault that prevents the system from booting.

CVSS severity5.5
Medium
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

Out-of-bounds read in the AMD IOMMU subsystem in affected Linux Kernel releases allows local users to trigger a boot-time crash. __rlookup_amd_iommu() indexes rlookup_table with an unchecked PCI device identifier, after which check_device() dereferences adjacent slab data as an amd_iommu structure. The crash requires an AMD IOMMU configuration whose IVRS omits a device BDF and a tightly allocated lookup table, producing a general protection fault that prevents the system from booting.

The record

CVE
CVE-2026-53283
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 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=6.16
  2. Affected versionversion=e874c666b15bcb6280c4e747d8de3879bb728829 <07d0f496fe7ec5abe3bee7e38be709521567bb33
  3. Affected versionversion=e874c666b15bcb6280c4e747d8de3879bb728829 <79db4cbab81f07ce69a93d379ebd40d3709ecfb2
  4. Affected versionversion=e874c666b15bcb6280c4e747d8de3879bb728829 <f0a0f01787ecece814414b0665df879b69849d09

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=e874c666b15bcb6280c4e747d8de3879bb728829 <07d0f496fe7ec5abe3bee7e38be709521567bb33; version=e874c666b15bcb6280c4e747d8de3879bb728829 <79db4cbab81f07ce69a93d379ebd40d3709ecfb2; version=e874c666b15bcb6280c4e747d8de3879bb728829 <f0a0f01787ecece814414b0665df879b69849d09

Published CVSS scores

5.5NIST NVDCVSS: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

CWE-476NULL Pointer Dereference
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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