CVE-2026-21734
GPU DDK - libusc OOB write at TreeRemove during WebGPU shader compilation
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.
INFO
Published Date :
June 26, 2026, 4:16 p.m.
Last Modified :
June 29, 2026, 6:44 p.m.
Remotely Exploit :
No
Source :
367425dc-4d06-4041-9650-c2dc6aaa27ce
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the GPU shader compiler library.
- Apply vendor-provided patches.
- Recompile affected shader code.
- Review compiler security settings.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-21734.
| URL | Resource |
|---|---|
| https://www.imaginationtech.com/gpu-driver-vulnerabilities/ | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-21734 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-21734
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-21734 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-21734 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jun. 29, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:imaginationtech:ddk:*:*:*:*:*:*:*:* versions up to (including) 25.2 *cpe:2.3:a:imaginationtech:ddk:25.3:rtm:*:*:*:*:*:* Added Reference Type imaginationtech: https://www.imaginationtech.com/gpu-driver-vulnerabilities/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 26, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Added SSVC {'id': 'CVE-2026-21734', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-06-26T19:12:05.663656Z'} -
New CVE Received by 367425dc-4d06-4041-9650-c2dc6aaa27ce
Jun. 26, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Imagination Technologies', 'product': 'Graphics DDK', 'versions': [{'status': 'affected', 'version': '1.18 RTM', 'versionType': 'custom'}, {'status': 'affected', 'version': '23.2 RTM', 'versionType': 'custom'}, {'status': 'affected', 'version': '24.1 RTM', 'versionType': 'custom', 'lessThanOrEqual': '24.2 RTM'}, {'status': 'affected', 'version': '25.1 RTM', 'versionType': 'custom', 'lessThanOrEqual': '25.3 RTM'}, {'status': 'unaffected', 'version': '26.1 RTM', 'versionType': 'custom'}], 'platforms': ['Linux', 'Android'], 'defaultStatus': 'unknown'}] Added 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. Added CWE CWE-823 Added Reference https://www.imaginationtech.com/gpu-driver-vulnerabilities/