GPU DDK - libusc OOB write at ConvertSwitchToArrayLookupBP during WebGPU shader compilation

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Summary

CVECVE-2026-21732
StatePUBLISHED
Assignerimaginationtech
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-20 23:16:42 UTC
Updated2026-04-21 16:55:05 UTC
DescriptionA web page that contains unusual GPU shader code is loaded into the GPU compiler process and can trigger a write out-of-bounds write crash in the GPU shader compiler library. On certain platforms, when the compiler process has system privileges this could enable further exploits on the device. An edge case using a very large value in switch statements in GPU shader code can cause a segmentation fault in the GPU shader compiler due to an out-of-bounds write access.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS: 0.000610000 probability, percentile 0.191550000 (date 2026-04-22)

Problem Types: CWE-823 | CWE-787 | CWE-823 CWE-823: Use of Out-of-range Pointer Offset (4.16)

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Imaginationtech Ddk 1.17 All All All
Application Imaginationtech Ddk 1.18 All All All
Application Imaginationtech Ddk 23.2 All All All
Application Imaginationtech Ddk All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Imagination Technologies Graphics DDK unaffected 1.17 RTM custom Linux, Android
CNA Imagination Technologies Graphics DDK unaffected 1.18 RTM custom Linux, Android
CNA Imagination Technologies Graphics DDK affected 23.2 RTM custom Linux, Android
CNA Imagination Technologies Graphics DDK affected 24.1 RTM 25.1 RTM custom Linux, Android
CNA Imagination Technologies Graphics DDK unaffected 25.2 RTM custom Linux, Android

References

ReferenceSourceLinkTags
www.imaginationtech.com/gpu-driver-vulnerabilities 367425dc-4d06-4041-9650-c2dc6aaa27ce www.imaginationtech.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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