CVE-2026-40393

critical

Description

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.

References

https://lists.freedesktop.org/archives/mesa-dev/2026-February/226597.html

https://lists.debian.org/debian-lts-announce/2026/07/msg00021.html

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39866

Details

Source: Mitre, NVD

Published: 2026-04-12

Updated: 2026-07-13

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H