CVE-2026-40393: In Mesa before 25.3.6 and 26 before 26.0.1, out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated data depends on an untrusted party, and is then used for alloca.
Overview
- Severity
- High (CVSS 8.1)
- CVSS Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Apr
- Released
- 2026-04-14
- Last Updated
- 2026-08-23
- EPSS Score
- 0.43% (percentile: 36.4%)
Affected Products (3)
Open Source Software
- azl3 mesa 24.0.1-6 on Azure Linux 3.0
- cbl2 mesa 21.0.0-4 on CBL Mariner 2.0
Other
Revision History
- 2026-04-14: Information published.
- 2026-04-17: Information published.
- 2026-04-18: Information published.
- 2026-08-23: Information published.