RHEL 9 : kpatch-patch-5_14_0-427_100_1, kpatch-patch-5_14_0-427_113_1, kpatch-patch-5_14_0-427_126_1, kpatch-patch-5_14_0-427_68_2, and kpatch-patch-5_14_0-427_84_1 (RHSA-2026:28738)

critical Nessus Plugin ID 322398

Synopsis

The remote Red Hat host is missing a security update for kpatch-patch-5_14_0-427_100_1 / kpatch-patch-5_14_0-427_113_1 / kpatch-patch-5_14_0-427_126_1 / kpatch-patch-5_14_0-427_68_2 / kpatch-patch-5_14_0-427_84_1.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:28738 advisory.

This is a kernel live patch module which can be loaded by the kpatch command line utility to modify the code of a running kernel. This patch module is targeted for kernel-5.14.0-427.68.2.el9_4.

Security Fix(es):

* kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037)

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 this issue but has instead relied only on the application's self-reported version number.

Solution

Update the RHEL kpatch-patch-5_14_0-427_100_1 / kpatch-patch-5_14_0-427_113_1 / kpatch-patch-5_14_0-427_126_1 / kpatch- patch-5_14_0-427_68_2 / kpatch-patch-5_14_0-427_84_1 packages based on the guidance in RHSA-2026:28738.

Plugin Details

Severity: Critical

ID: 322398

File Name: redhat-RHSA-2026-28738.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 6/24/2026

Updated: 6/24/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-43037

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:redhat:rhel_e4s:9.4, p-cpe:/a:redhat:enterprise_linux:kpatch-patch-5_14_0-427_100_1, p-cpe:/a:redhat:enterprise_linux:kpatch-patch-5_14_0-427_84_1, p-cpe:/a:redhat:enterprise_linux:kpatch-patch-5_14_0-427_126_1, p-cpe:/a:redhat:enterprise_linux:kpatch-patch-5_14_0-427_113_1, p-cpe:/a:redhat:enterprise_linux:kpatch-patch-5_14_0-427_68_2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/24/2026

Vulnerability Publication Date: 4/23/2026

Reference Information

CVE: CVE-2026-43037

CWE: 843

RHSA: 2026:28738

Detections

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