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Debian LTS mesa High Severity Out-of-Bounds Memory Access CVE-2026-40393

debian lts
Calendar Grey July 13, 2026
Dist Debian Esm H88
A critical security update for mesa addresses out-of-bounds memory access in Debian LTS that could be exploited by crafted input.
A vulnerability has been found in the mesa 3D graphics library, possibly allowing out of bound memory access by craftet input
Topics%20covered

Topics Covered

security advisory important memory access out-of-bounds mesa deblts

Summary

CVE-2026-40393

An 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.

For Debian 11 bullseye, this problem has been fixed in version
20.3.5-1+deb11u1.

For Debian 12 bookworm, this problem has been fixed in version
$bookworm_VERSION.

We recommend that you upgrade your mesa packages.

For the detailed security status of mesa please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/mesa

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS



Severity
important
Lowest
Low
Medium
High
Critical

Package: mesa
Version: 20.3.5-1+deb11u1 $bookworm_VERSION
CVE ID: CVE-2026-40393
Debian Bug:

Topics%20covered

Topics Covered

security advisory important memory access out-of-bounds mesa deblts

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