HIGH 8.1 Microsoft
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.
Microsoft Security Update 2026-Apr: 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.
Affected Products
- azl3 mesa 24.0.1-6 on Azure Linux 3.0
- cbl2 mesa 21.0.0-4 on CBL Mariner 2.0
- cbl2 mesa 21.0.0-4 on CBL-Mariner 2.0
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40393
- https://nvd.nist.gov/vuln/detail/CVE-2026-40393
This high severity vulnerability with a CVSS score of 8.1 was published on 2026-04-14 via Microsoft. Affected: azl3 mesa 24.0.1-6 on Azure Linux 3.0, cbl2 mesa 21.0.0-4 on CBL Mariner 2.0, cbl2 mesa 21.0.0-4 on CBL-Mariner 2.0.
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