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.

According to the versions of the mesa packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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.(CVE-2026-40393)

Tenable has extracted the preceding description block directly from the EulerOS mesa security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4679 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4679-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                         Tobias Frost     July 13, 2026                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

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

    A vulnerability has been found in the mesa 3D graphics library, possibly     allowing out of bound memory access by craftet input.

    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     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by a vulnerability as referenced in the USN-8427-1 advisory.

    It was discovered that Mesa did not properly validate memory allocation sizes in WebGPU under certain     circumstances. An attacker could use this issue to cause Mesa to crash, resulting in a denial of service,     or possibly execute arbitrary code.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

According to the versions of the mesa packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

    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.(CVE-2026-40393)

Tenable has extracted the preceding description block directly from the EulerOS Virtualization mesa security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

It is, therefore, affected by a vulnerability as referenced in the ALAS2-2026-3330 advisory.

    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.
    (CVE-2026-40393)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1839-1 advisory.

    This update for Mesa fixes the following issue:

    - CVE-2026-40393: out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated     data depends on       an untrusted party (bsc#1261998).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 host has packages installed that are affected by a vulnerability as referenced in the SUSE- SU-2026:1844-1 advisory.

    This update for Mesa fixes the following issue:

    - CVE-2026-40393: out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated     data depends on       an untrusted party (bsc#1261998).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:1835-1 advisory.

    This update for Mesa fixes the following issue:

    - CVE-2026-40393: out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated     data depends on       an untrusted party (bsc#1261998).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:1845-1 advisory.

    This update for Mesa fixes the following issue:

    - CVE-2026-40393: out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated     data depends on       an untrusted party (bsc#1261998).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by a vulnerability as referenced in the openSUSE- SU-2026:20688-1 advisory.

    This update for Mesa fixes the following issue:

    - CVE-2026-40393: out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated     data depends on an untrusted party (bsc#1261998).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

An update of the mesa package has been released.

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1623 advisory.

    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.
    (CVE-2026-40393)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-40393)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
326627	EulerOS 2.0 SP10 : mesa (EulerOS-SA-2026-2703)	Nessus	Huawei Local Security Checks	critical
326620	EulerOS 2.0 SP10 : mesa (EulerOS-SA-2026-2662)	Nessus	Huawei Local Security Checks	critical
326485	Debian dla-4679 : libd3dadapter9-mesa - security update	Nessus	Debian Local Security Checks	critical
326180	EulerOS 2.0 SP12 : mesa (EulerOS-SA-2026-2607)	Nessus	Huawei Local Security Checks	critical
326121	EulerOS 2.0 SP12 : mesa (EulerOS-SA-2026-2547)	Nessus	Huawei Local Security Checks	critical
323226	EulerOS 2.0 SP15 : mesa (EulerOS-SA-2026-2492)	Nessus	Huawei Local Security Checks	critical
323209	EulerOS 2.0 SP15 : mesa (EulerOS-SA-2026-2451)	Nessus	Huawei Local Security Checks	critical
321181	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : Mesa vulnerability (USN-8427-1)	Nessus	Ubuntu Local Security Checks	critical
320730	EulerOS Virtualization 2.13.0 : mesa (EulerOS-SA-2026-2407)	Nessus	Huawei Local Security Checks	critical
320704	EulerOS Virtualization 2.13.1 : mesa (EulerOS-SA-2026-2378)	Nessus	Huawei Local Security Checks	critical
320297	EulerOS 2.0 SP13 : mesa (EulerOS-SA-2026-2301)	Nessus	Huawei Local Security Checks	critical
320295	EulerOS 2.0 SP13 : mesa (EulerOS-SA-2026-2344)	Nessus	Huawei Local Security Checks	critical
319980	EulerOS 2.0 SP11 : mesa (EulerOS-SA-2026-2254)	Nessus	Huawei Local Security Checks	critical
319938	EulerOS 2.0 SP11 : mesa (EulerOS-SA-2026-2217)	Nessus	Huawei Local Security Checks	critical
319838	Amazon Linux 2 : mesa, --advisory ALAS2-2026-3330 (ALAS-2026-3330)	Nessus	Amazon Linux Local Security Checks	critical
315065	SUSE SLED15 / SLES15 Security Update : Mesa (SUSE-SU-2026:1839-1)	Nessus	SuSE Local Security Checks	critical
315064	SUSE SLES12 Security Update : Mesa (SUSE-SU-2026:1844-1)	Nessus	SuSE Local Security Checks	critical
315060	SUSE SLED15 / SLES15 Security Update : Mesa (SUSE-SU-2026:1835-1)	Nessus	SuSE Local Security Checks	critical
315045	SUSE SLED15 / SLES15 Security Update : Mesa (SUSE-SU-2026:1845-1)	Nessus	SuSE Local Security Checks	critical
313691	openSUSE 16 Security Update : Mesa (openSUSE-SU-2026:20688-1)	Nessus	SuSE Local Security Checks	critical
312352	Photon OS 4.0: Mesa PHSA-2026-4.0-1009	Nessus	PhotonOS Local Security Checks	critical
311316	Amazon Linux 2023 : mesa-dri-drivers, mesa-filesystem, mesa-libd3d (ALAS2023-2026-1623)	Nessus	Amazon Linux Local Security Checks	critical
310705	Photon OS 5.0: Mesa PHSA-2026-5.0-0833	Nessus	PhotonOS Local Security Checks	critical
306057	Linux Distros Unpatched Vulnerability : CVE-2026-40393	Nessus	Misc.	critical

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