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Rocky Linux 8 [CIQ] Security Update: microcode_ctl Multiple Vulnerabilities (crlsa-2026_65147)

high Nessus Plugin ID 354472

Synopsis

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

Description

The Rocky Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the CIQ crlsa-2026_65147 advisory.

 * kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling (CVE-2025-35973)

 * kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM (CVE-2025-31936)

 Bug Fix(es) and Enhancement(s):

 * [Rocky Linux 8] Update Intel CPU microcode to the latest version (JIRA:Rocky Linux-240770)

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

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 microcode_ctl package based on the guidance in CIQ advisory crlsa-2026_65147.

See Also

https://access.redhat.com/errata/RHSA-2026:65147

https://bugzilla.redhat.com/show_bug.cgi?id=2514104

https://bugzilla.redhat.com/show_bug.cgi?id=2514115

https://errata.build.resf.org/RLSA-2026:65147

http://www.nessus.org/u?664c0fd2

http://www.nessus.org/u?b82e35da

Plugin Details

Severity: High

ID: 354472

File Name: ciq_rocky_linux_8_crlsa-2026_65147.nasl

Version: 1.1

Type: Local

Published: 10/1/2026

Updated: 10/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.82

Vendor

Vendor Severity: Unknown

CVSS v2

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 3.9

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

CVSS Score Source: CVE-2025-31936

CVSS v3

Risk Factor: Medium

Base Score: 5.7

Temporal Score: 5

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

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

CVSS v4

Risk Factor: High

Base Score: 7

Threat Score: 3.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/9/2026

Vulnerability Publication Date: 8/11/2026

Reference Information

CVE: CVE-2025-31936, CVE-2025-35973