CVE-2026-21734 GPU DDK - libusc OOB write at TreeRemove during WebGPU shader compilation
A malicious web page can trigger an out-of-bounds write in the GPU shader compiler, potentially leading to code execution or privilege escalation on affected devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-21734?
CVE-2026-21734 is a high-severity memory corruption vulnerability in Imagination Technologies Graphics DDK, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-823
Which versions are affected by CVE-2026-21734?
It affects 1 product.
Products include Imaginationtech Ddk.
How do I fix CVE-2026-21734?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-21734 being exploited?
There is no known exploitation of CVE-2026-21734 in the wild and no public exploit code.
Other vulnerabilities in Imagination Technologies Graphics DDK
- CVE-2026-16280 GPU DDK - Integer overflow in _PMRLogicalOffsetToPhysicalOffset
- CVE-2025-13952 GPU DDK - libusc UAF via WebGPU shaders at MergeConsecutiveBarriersBP
- CVE-2026-21732 GPU DDK - libusc OOB write at ConvertSwitchToArrayLookupBP during WebGPU shader compilation
- CVE-2025-25176 GPU DDK - GPU Register value contents leaked from secure workloads to non-secure world
- CVE-2025-58411 GPU DDK - Reservation::psMappedPMR can change while used by a freelist -> UAF
Sources
Also known as A-473852583, ASB-A-473852583, GHSA-c5qr-j92g-m289.