CVE-2026-21732
CWE-823Published: March 20, 2026· Updated: Mar 23, 2026
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 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 Analysis
This critical vulnerability involves a write out-of-bounds crash in the GPU shader compiler library, triggered by unusual GPU shader code on a web page. With a CVSS score of 9.6, this flaw presents a severe risk, as it can lead to further exploits on devices where the compiler process has system privileges. The absence of an EPSS score and KEV listing means current exploitation is not confirmed, but the severity warrants immediate attention.
No public exploit is known for this vulnerability. The flaw is remotely exploitable (AV:N) with low attack complexity, requiring user interaction (UI:R) to load a malicious web page.
Ensure that GPU shader compilers are updated to address out-of-bounds write vulnerabilities. Implement strict validation and sanitization of GPU shader code to prevent malicious input.
Technical Analysis
CVE-2026-21732 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.6.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
CVSS v3.1 Vector Breakdown
Exploit & PoC Resources
All References (1)
Quick Facts
Related CVEs (CWE-823)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-21732 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts