CVE-2026-45203

Host-kernel overwrite via mutable command-size TOCTOU

Published Jul 10, 2026 · Updated Jul 10, 2026

TOCTOU in Imagination Technologies Graphics DDK allows local users in a Host VM to overwrite host-kernel memory via GPU commands. The rgxfw_hwperf_ufo() firmware function checks psCmdHeader->ui32CmdSize, then re-reads the mutable field before use, so a malicious driver can enlarge the command after validation. Kernel software must already be installed and running inside the Host VM; successful abuse crosses the VM boundary and corrupts host-kernel memory.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU in Imagination Technologies Graphics DDK allows local users in a Host VM to overwrite host-kernel memory via GPU commands. The rgxfw_hwperf_ufo() firmware function checks psCmdHeader->ui32CmdSize, then re-reads the mutable field before use, so a malicious driver can enlarge the command after validation. Kernel software must already be installed and running inside the Host VM; successful abuse crosses the VM boundary and corrupts host-kernel memory.

The record

CVE
CVE-2026-45203
Published
Jul 10, 2026
Updated
Jul 10, 2026
Vendor
Imagination Technologies
Product
Graphics DDK
Classifications
CWE-367, CAPEC-480, T1611
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 10, 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 privilegesauthenticated

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

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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
Privilegesauthenticated
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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