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Oracle Linux 8 / 9 : Unbreakable Enterprise kernel (ELSA-2025-20559)

medium Nessus Plugin ID 274745

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Synopsis

The remote Oracle Linux host is missing a security update.

Description

The remote Oracle Linux 8 / 9 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2025-20559 advisory.

 [5.15.0-312.187.5.1]
 - x86/vmscape: Warn when STIBP is disabled with SMT (Pawan Gupta) [Orabug: 38343660]
 - x86/bugs: Move cpu_bugs_smt_update() down (Pawan Gupta) [Orabug: 38343660]
 - x86/vmscape: Enable the mitigation (Pawan Gupta) [Orabug: 38343660]
 - x86/vmscape: Add conditional IBPB mitigation (Pawan Gupta) [Orabug: 38343660]
 - x86/bugs: Fix RSB clearing in indirect_branch_prediction_barrier() (Josh Poimboeuf) [Orabug: 38343660]
 - x86/vmscape: Add old Intel CPUs to affected list (Pawan Gupta) [Orabug: 38343660]
 - x86/vmscape: Enumerate VMSCAPE bug (Pawan Gupta) [Orabug: 38343660]
 - Documentation/hw-vuln: Add VMSCAPE documentation (Pawan Gupta) [Orabug: 38343660]

Tenable has extracted the preceding description block directly from the Oracle 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.

Solution

Update the affected packages.

See Also

https://linux.oracle.com/errata/ELSA-2025-20559.html

Plugin Details

Severity: Medium

ID: 274745

File Name: oraclelinux_ELSA-2025-20559.nasl

Version: 1.1

Type: local

Agent: unix

Published: 11/11/2025

Updated: 11/11/2025

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2025-40300

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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

Vulnerability Information

CPE: p-cpe:/a:oracle:linux:kernel-uek64k-core, p-cpe:/a:oracle:linux:kernel-uek-doc, cpe:/o:oracle:linux:9, p-cpe:/a:oracle:linux:kernel-uek-debug-core, p-cpe:/a:oracle:linux:kernel-uek-debug, p-cpe:/a:oracle:linux:kernel-uek-debug-modules-extra, p-cpe:/a:oracle:linux:kernel-uek-modules, p-cpe:/a:oracle:linux:kernel-uek-container, p-cpe:/a:oracle:linux:kernel-uek-devel, cpe:/o:oracle:linux:8, p-cpe:/a:oracle:linux:kernel-uek-debug-modules, p-cpe:/a:oracle:linux:kernel-uek, p-cpe:/a:oracle:linux:kernel-uek64k-modules, cpe:/o:oracle:linux:9:6:baseos_patch, p-cpe:/a:oracle:linux:kernel-uek64k, p-cpe:/a:oracle:linux:bpftool, p-cpe:/a:oracle:linux:kernel-uek-core, p-cpe:/a:oracle:linux:kernel-uek64k-modules-extra, p-cpe:/a:oracle:linux:kernel-uek-modules-extra, p-cpe:/a:oracle:linux:kernel-uek-debug-devel, p-cpe:/a:oracle:linux:kernel-uek64k-devel, p-cpe:/a:oracle:linux:kernel-uek-container-debug

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/OracleLinux

Exploit Ease: No known exploits are available

Patch Publication Date: 9/9/2025

Vulnerability Publication Date: 9/11/2025

Reference Information

CVE: CVE-2025-40300