CVE-2026-93178Hinoki check available

Disclosure and GPU hang via unchecked voltage indices

Published Sep 17, 2026 · Updated Sep 18, 2026

Out-of-bounds reads in Linux kernel SMU7 PowerPlay code allow local users to disclose kernel heap data or hang the GPU via pp_table. smu7_patch_voltage_dependency_tables_with_lookup_table uses attacker-controlled VBIOS ucVddInd and ucVddcInd bytes as indices into 16-entry voltage lookup arrays without checking their bounds. Reachability requires local write access to the SMU7 AMDGPU pp_table sysfs node; chosen indices can read kernel-heap bytes, fault the kernel, or feed garbage voltages that hang the GPU.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds reads in Linux kernel SMU7 PowerPlay code allow local users to disclose kernel heap data or hang the GPU via pp_table. smu7_patch_voltage_dependency_tables_with_lookup_table uses attacker-controlled VBIOS ucVddInd and ucVddcInd bytes as indices into 16-entry voltage lookup arrays without checking their bounds. Reachability requires local write access to the SMU7 AMDGPU pp_table sysfs node; chosen indices can read kernel-heap bytes, fault the kernel, or feed garbage voltages that hang the GPU.

The record

CVE
CVE-2026-93178
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=4.5
  2. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <1664327ce797e09e387dc10cbbaa5b8d76558d2c
  3. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <3a8a05477cda6c8293e2b629495b42981dcaba32
  4. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <6f08c001fa6e8212930d694540ae8d9d6d3fb58a
  5. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <745297208d31222f916cc04da313cb737b997935
  6. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <8a3db9f593b643904c6cc6d8a3f211c84ca6cf8a
  7. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <ce0d8e72836c9d3710a160ad848b0f1d096075e3
  8. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <d9ef085114d1e3c2c1f869c0bdb275a7b358ce8b
  9. Affected versionversion=c82baa28184356a75c0157129f88af42b2e7b695 <f925d317d84d401d642e537ea18ee12f67cb6983

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=c82baa28184356a75c0157129f88af42b2e7b695 <1664327ce797e09e387dc10cbbaa5b8d76558d2c; version=c82baa28184356a75c0157129f88af42b2e7b695 <3a8a05477cda6c8293e2b629495b42981dcaba32; version=c82baa28184356a75c0157129f88af42b2e7b695 <6f08c001fa6e8212930d694540ae8d9d6d3fb58a; version=c82baa28184356a75c0157129f88af42b2e7b695 <745297208d31222f916cc04da313cb737b997935; version=c82baa28184356a75c0157129f88af42b2e7b695 <8a3db9f593b643904c6cc6d8a3f211c84ca6cf8a; version=c82baa28184356a75c0157129f88af42b2e7b695 <ce0d8e72836c9d3710a160ad848b0f1d096075e3; version=c82baa28184356a75c0157129f88af42b2e7b695 <d9ef085114d1e3c2c1f869c0bdb275a7b358ce8b; version=c82baa28184356a75c0157129f88af42b2e7b695 <f925d317d84d401d642e537ea18ee12f67cb6983

Published CVSS scores

7.1Linux CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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