A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017405 advisory.

    A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can     be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.

Tenable has extracted the preceding description block directly from the Unity Linux 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 multiple vulnerabilities as referenced in the dla-4207 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4207-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                      Markus Koschany     June 05, 2025                                 https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : edk2     Version        : 2020.11-2+deb11u3     CVE ID         : CVE-2021-28216 CVE-2021-38575 CVE-2021-38576 CVE-2021-38578                      CVE-2022-36763 CVE-2022-36764 CVE-2022-36765 CVE-2023-45229                      CVE-2023-45230 CVE-2023-45231 CVE-2023-45232 CVE-2023-45233                      CVE-2023-45234 CVE-2023-45235 CVE-2024-1298 CVE-2024-38796     Debian Bug     : 1014468 1060408 1084055 1061256

    Multiple security vulnerabilities have been fixed in EDK II, a modern,     feature-rich, cross-platform firmware development environment. Remotely     exploitable buffer overflows and out-of-bounds or infinite loop     vulnerabilities may lead to a denial of service or the execution of     arbitrary code.

    For Debian 11 bullseye, these problems have been fixed in version     2020.11-2+deb11u3.

    We recommend that you upgrade your edk2 packages.

    For the detailed security status of edk2 please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/edk2

    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: This is a digitally signed message part

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

Note that Nessus has not tested for these issues 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.

  - A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can     be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.
    (CVE-2021-38576)

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2024-2722 advisory.

    A heap overflow in LzmaUefiDecompressGetInfo function in EDK II. (CVE-2021-28211)

    BootPerformanceTable pointer is read from an NVRAM variable in PEI. Recommend setting     PcdFirmwarePerformanceDataTableS3Support to FALSE. (CVE-2021-28216)

    A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can     be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.
    (CVE-2021-38576)

    Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
    (CVE-2021-38578)

    EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. Thisvulnerability can     be exploited by an attacker to gain unauthorizedaccess and potentially lead to a loss of Confidentiality.
    (CVE-2023-45236)

    EDK2's Network Package is susceptible to a predictable TCP Initial Sequence Number. Thisvulnerability can     be exploited by an attacker to gain unauthorizedaccess and potentially lead to a loss of Confidentiality.
    (CVE-2023-45237)

    EDK2 contains a vulnerability in the PeCoffLoaderRelocateImage(). An Attacker may cause memory corruption     due to an overflow via an adjacent network. A successful exploit of this vulnerability may lead to a loss     of Confidentiality, Integrity, and/or Availability. (CVE-2024-38796)

    Issue summary: Use of the low-level GF(2^m) elliptic curve APIs with untrustedexplicit values for the     field polynomial can lead to out-of-bounds memory readsor writes.

    Impact summary: Out of bound memory writes can lead to an application crash oreven a possibility of a     remote code execution, however, in all the protocolsinvolving Elliptic Curve Cryptography that we're aware     of, either only namedcurves are supported, or, if explicit curve parameters are supported, theyspecify     an X9.62 encoding of binary (GF(2^m)) curves that can't representproblematic input values. Thus the     likelihood of existence of a vulnerableapplication is low.

    In particular, the X9.62 encoding is used for ECC keys in X.509 certificates,so problematic inputs cannot     occur in the context of processing X.509certificates.  Any problematic use-cases would have to be using an     exoticcurve encoding.

    The affected APIs include: EC_GROUP_new_curve_GF2m(), EC_GROUP_new_from_params(),and various supporting     BN_GF2m_*() functions.

    Applications working with exotic explicit binary (GF(2^m)) curve parameters,that make it possible to     represent invalid field polynomials with a zeroconstant term, via the above or similar APIs, may terminate     abruptly as aresult of reading or writing outside of array bounds.  Remote code executioncannot easily be     ruled out.

    The FIPS modules in 3.3, 3.2, 3.1 and 3.0 are not affected by this issue. (CVE-2024-9143)

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

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

According to the versions of the edk2 package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :

  - A BIOS bug in firmware for a particular PC model leaves the Platform authorization value empty. This can     be used to permanently brick the TPM in multiple ways, as well as to non-permanently DoS the system.
    (CVE-2021-38576)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
314092	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: edk2 (UTSA-2026-017405)	Nessus	Unity Linux Local Security Checks	high
237864	Debian dla-4207 : ovmf - security update	Nessus	Debian Local Security Checks	critical
224027	Linux Distros Unpatched Vulnerability : CVE-2021-38576	Nessus	Misc.	high
213371	Amazon Linux 2 : edk2 (ALAS-2024-2722)	Nessus	Amazon Linux Local Security Checks	high
163181	EulerOS Virtualization 2.10.1 : edk2 (EulerOS-SA-2022-2072)	Nessus	Huawei Local Security Checks	high
163140	EulerOS Virtualization 2.10.0 : edk2 (EulerOS-SA-2022-2044)	Nessus	Huawei Local Security Checks	high

Detections

Analytics

CVE-2021-38576

high

Tenable Plugins

high

critical

high

high

high

high