CVE-2026-46156

System crash via random MMIO address read

Published May 28, 2026 · Updated May 28, 2026

Invalid address access in Linux Kernel LoongArch PCI setup allows local users to crash the system during device discovery. loongson_gpu_fixup_dma_hang() derives a device from pdev->devfn plus one, handles only DC2 and DC3, and otherwise passes an unset crtc_reg address to readl(). The panic requires a LoongArch system with the relevant discrete-GPU PCI topology and occurs while the kernel scans devices during startup.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid address access in Linux Kernel LoongArch PCI setup allows local users to crash the system during device discovery. loongson_gpu_fixup_dma_hang() derives a device from pdev->devfn plus one, handles only DC2 and DC3, and otherwise passes an unset crtc_reg address to readl(). The panic requires a LoongArch system with the relevant discrete-GPU PCI topology and occurs while the kernel scans devices during startup.

The record

CVE
CVE-2026-46156
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=151ba1721ac50765e16d293256389ef14553b46e <2cb19b06c09983727573bbe7d7430cbad480a714
  2. Affected versionversion=3446dd359ba9a6ce5a1ca389c0d48c434d3cc915
  3. Affected versionversion=6.1.168 <6.2
  4. Affected versionversion=6.12.80 <6.12.88
  5. Affected versionversion=6.18.21 <6.18.30
  6. Affected versionversion=6.19.11 <6.20
  7. Affected versionversion=6.6.131 <6.6.140
  8. Affected versionversion=7.0
  9. Affected versionversion=70fb63c5d36cc02eaf336b87ac6a82e657f832a4 <9e1aed63a5552958ef2a9bfd699a3f990e52a77f
  10. Affected versionversion=95db0c9f526d583634cddb2e5914718570fbac87 <81fef1c278436e6bd68ee4ca05a0acb96e256561
  11. Affected versionversion=95db0c9f526d583634cddb2e5914718570fbac87 <8dfa2f8780e486d05b9a0ffce70b8f5fbd62053e
  12. Affected versionversion=a31da4d5d1fc29d92d2410c60e1ca298b02a6528
  13. Affected versionversion=f458dceaa6a35f89180ebd14484983d8e79ecd10 <07d190e4ec689d6478f7f5e36099fb9bf457e7c5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=151ba1721ac50765e16d293256389ef14553b46e <2cb19b06c09983727573bbe7d7430cbad480a714; version=3446dd359ba9a6ce5a1ca389c0d48c434d3cc915; version=6.1.168 <6.2; version=6.12.80 <6.12.88; version=6.18.21 <6.18.30; version=6.19.11 <6.20; version=6.6.131 <6.6.140; version=7.0; version=70fb63c5d36cc02eaf336b87ac6a82e657f832a4 <9e1aed63a5552958ef2a9bfd699a3f990e52a77f; version=95db0c9f526d583634cddb2e5914718570fbac87 <81fef1c278436e6bd68ee4ca05a0acb96e256561; version=95db0c9f526d583634cddb2e5914718570fbac87 <8dfa2f8780e486d05b9a0ffce70b8f5fbd62053e; version=a31da4d5d1fc29d92d2410c60e1ca298b02a6528; version=f458dceaa6a35f89180ebd14484983d8e79ecd10 <07d190e4ec689d6478f7f5e36099fb9bf457e7c5

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-667Improper Locking
T1499.004Application 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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