RHEL 9 : runc (RHSA-2026:4531)

high Nessus Plugin ID 302020

Synopsis

The remote Red Hat host is missing one or more security updates for runc.

Description

The remote Redhat Enterprise Linux 9 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:4531 advisory.

The runC tool is a lightweight, portable implementation of the Open Container Format (OCF) that provides container runtime.

Security Fix(es):

* runc: container escape via 'masked path' abuse due to mount race conditions (CVE-2025-31133)

* runc: container escape with malicious config due to /dev/console mount and related races (CVE-2025-52565)

* runc: container escape and denial of service due to arbitrary write gadgets and procfs write redirects (CVE-2025-52881)

* github.com/sirupsen/logrus: github.com/sirupsen/logrus: Denial-of-Service due to large single-line payload (CVE-2025-65637)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux 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 RHEL runc package based on the guidance in RHSA-2026:4531.

Plugin Details

Severity: High

ID: 302020

File Name: redhat-RHSA-2026-4531.nasl

Version: 1.1

Type: local

Agent: unix

Family: Red Hat Local Security Checks

Published: 3/12/2026

Updated: 3/12/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.2

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 6

Temporal Score: 4.7

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

CVSS Score Source: CVE-2025-52881

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

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

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

CVSS Score Source: CVE-2025-31133

CVSS v4

Risk Factor: High

Base Score: 8.4

Threat Score: 7.1

Threat Vector: CVSS:4.0/E:P

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

CVSS Score Source: CVE-2025-52565

Vulnerability Information

CPE: cpe:/o:redhat:rhel_e4s:9.2, p-cpe:/a:redhat:enterprise_linux:runc

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/12/2026

Vulnerability Publication Date: 11/5/2025

Reference Information

CVE: CVE-2025-31133, CVE-2025-52565, CVE-2025-52881, CVE-2025-65637

CWE: 400, 59

RHSA: 2026:4531

Detections

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