GPU DDK - libusc OOB write at TreeRemove during WebGPU shader compilation
Priority LOW 39CWE-823Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
A 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 small value in GPU shader code can cause a segmentation fault in the GPU shader compiler due to am out-of-bounds write.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00162 5th percentileScored 2026-11-07
Fix Fixed Graphics DDK (Imagination Technologies): 26.1 RTM
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Imagination Technologies | Graphics DDK | 1.18 RTM; 23.2 RTM; 24.1 RTM – 24.2 RTM; 25.1 RTM – 25.3 RTM | 26.1 RTM | Patch available | CNA |
- Graphics DDK VendorImagination Technologies Affected 1.18 RTM; 23.2 RTM; 24.1 RTM – 24.2 RTM; 25.1 RTM – 25.3 RTM Fixed in 26.1 RTM Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:imaginationtech:ddk:*:*:*:*:*:*:*:* | up to 25.2 | Vulnerable | Imagination Technologies |
| cpe:2.3:a:imaginationtech:ddk:25.3:rtm:*:*:*:*:*:* | 25.3 rtm | Vulnerable | Imagination Technologies |
- cpe:2.3:a:imaginationtech:ddk:*:*:*:*:*:*:*:* Versions up to 25.2 Vulnerable ·Imagination Technologies
- cpe:2.3:a:imaginationtech:ddk:25.3:rtm:*:*:*:*:*:* Versions 25.3 rtm Vulnerable ·Imagination Technologies
Remediation
- Fix · CNA Graphics DDK (Imagination Technologies) Fixed in 26.1 RTM
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21734
- 2026-10-03 Alias added: GHSA-c5qr-j92g-m289
References
More Imagination Technologies Ddk vulnerabilities
- TI-2023-04574 GPU kernel implementations susceptible to memory leak CVSS 3.1MEDIUM 6.5
- TI-2026-13612 GPU DDK - Integer overflow in _PMRLogicalOffsetToPhysicalOffset CVSS 3.1CRITICAL 9.8
- TI-2025-12749 GPU DDK - libusc UAF via WebGPU shaders at MergeConsecutiveBarriersBP CVSS 3.1CRITICAL 9.8
- TI-2025-18845 GPU DDK - GPU Register value contents leaked from secure workloads to non-secure world CVSS 3.1CRITICAL 9.1
- TI-2026-17504 GPU DDK - libusc OOB write at ConvertSwitchToArrayLookupBP during WebGPU shader compilation CVSS 3.1CRITICAL 9.6
- TI-2025-36180 GPU DDK - Reservation::psMappedPMR can change while used by a freelist -> UAF CVSS 3.1HIGH 8.8
Sources
- CVE-2026-21734 · CVE Program
- CVE-2026-21734 · NVD
- FIRST EPSS
- GHSA-c5qr-j92g-m289 · GitHub Advisory Database · CC BY 4.0
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