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CentOS Linux 8.5 [TuxCare] Security Update: edk2-ovmf / edk2-tools / edk2-tools-doc Multiple Vulnerabilities (CENTOS8.5:CLSA-2026:1794746693)

critical Nessus Plugin ID 381518

Synopsis

The CentOS Linux host is missing one or more security updates.

Description

The CentOS Linux 8.5 host has packages installed that are affected by multiple vulnerabilities as referenced in the TuxCare CENTOS8.5:CLSA-2026:1794746693 advisory.

 - EDK2 is susceptible to a vulnerability in the Tcg2MeasurePeImage() function, allowing a user to trigger a heap buffer overflow via a local network. Successful exploitation of this vulnerability may result in a compromise of confidentiality, integrity, and/or availability. (CVE-2022-36764)

 - EDK2's Network Package is susceptible to a buffer overflow vulnerability via a long server ID option in DHCPv6 client. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality, Integrity and/or Availability. (CVE-2023-45230)

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

 - EDK2's Network Package is susceptible to a buffer overflow vulnerability when handling Server ID option from a DHCPv6 proxy Advertise message. This vulnerability can be exploited by an attacker to gain unauthorized access and potentially lead to a loss of Confidentiality, Integrity and/or Availability.
 (CVE-2023-45235)

 - EDK2 contains a vulnerability in BIOS where a user may cause Out-of-bounds Write, Classic Buffer Overflow, and Incorrect Calculation of Buffer Size by remote access. Successful exploitation of this vulnerability can lead to arbitrary code execution. It could also impact Confidentiality, Integrity, and Availability. (CVE-2026-97631)

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

Solution

Update the affected packages based on the guidance in TuxCare advisory CENTOS8.5:CLSA-2026:1794746693.

See Also

https://cve.tuxcare.com/els/releases/CLSA-2026:1794746693

http://www.nessus.org/u?e91daacb

Plugin Details

Severity: Critical

ID: 381518

File Name: tuxcare_centos_8.5_CLSA-2026-1794746693.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 11/15/2026

Updated: 11/15/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.33

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2021-38578

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9.5

Threat Score: 9

Threat Vector: CVSS:4.0/E:P

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS Score Source: CVE-2026-97631

Vulnerability Information

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/OS/extended-third-party

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/15/2026

Vulnerability Publication Date: 3/3/2022

Reference Information

CVE: CVE-2021-38578, CVE-2022-36763, CVE-2022-36764, CVE-2023-45230, CVE-2023-45232, CVE-2023-45233, CVE-2023-45234, CVE-2023-45235, CVE-2026-97631

CLSA: 2026:1794746693