CVE-2026-21736 GPU DDK - Insufficient permission check in PhysmemWrapExtMem() when write attribute support enabled
A non-privileged user can gain write access to read-only memory via improper GPU system calls, requiring write attribute support to be enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-21736?
CVE-2026-21736 is a medium-severity vulnerability in Imagination Technologies Graphics DDK, published on 9 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Software installed and run as a non-privileged user may conduct improper GPU system calls to gain write permission to read-only wrapped user-mode memory.
This is caused by improper handling of the memory protections for the user-mode wrapped memory resource.
Weakness: CWE-280
Which versions are affected by CVE-2026-21736?
It affects 1 product.
Products include Imaginationtech Ddk.
How do I fix CVE-2026-21736?
Apply the vendor's patch.
Is CVE-2026-21736 being exploited?
There is no known exploitation of CVE-2026-21736 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-382331631, ASB-A-382331631, GHSA-vjrg-fwqx-82jx.