CVE-2026-45197

Guest GPU memory escape via firmware TOCTOU

Published Sep 4, 2026 · Updated Sep 4, 2026

A TOCTOU race in Imagination Technologies Graphics DDK allows guest OS users to read or write beyond virtualized GPU memory. GPU firmware validates guest-provided data before using it to configure memory access, but psFWMemContext->uiPageCatBaseRegSet can change between the check and use, invalidating the earlier result. Exploitation requires kernel software running inside a guest VM and crosses that guest's virtualized GPU memory boundary.

CVSS severityUnavailable
Unscored
EPSS probability0.07%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A TOCTOU race in Imagination Technologies Graphics DDK allows guest OS users to read or write beyond virtualized GPU memory. GPU firmware validates guest-provided data before using it to configure memory access, but psFWMemContext->uiPageCatBaseRegSet can change between the check and use, invalidating the earlier result. Exploitation requires kernel software running inside a guest VM and crosses that guest's virtualized GPU memory boundary.

The record

CVE
CVE-2026-45197
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
Imagination Technologies
Product
Graphics DDK
Classifications
CWE-367, CAPEC-480, T1611
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=1.18 RTM2
  2. Affected versionversion=23.2 RTM2
  3. Affected versionversion=24.2 RTM2
  4. Affected versionversion=25.1 RTM2 <=25.3 RTM
  5. Affected versionversion=26.1 RTM1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Imagination Technologies · Graphics DDKversion=1.18 RTM2; version=23.2 RTM2; version=24.2 RTM2; version=25.1 RTM2 <=25.3 RTM; version=26.1 RTM1

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC-480Escaping Virtualization
T1611Escape to Host

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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