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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_146_1, and kpatch-patch-5_14_0-427_84_1 (RHSA-2026:91639)

critical Nessus Plugin ID 373594

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Synopsis

The remote Red Hat host is missing one or more security updates 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_146_1 / kpatch-patch-5_14_0-427_84_1.

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:91639 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-5.14.0-427.100.1.el9_4.

 Security Fix(es):

 * kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266)

 * kernel: pppoe: reload header pointer after dev_hard_header() (CVE-2026-68121)

 * kernel: net: bridge: stop fast-leave after deleting a port group (CVE-2026-74480)

 * kernel: packet: use consistent hard_header_len in non-ring send paths (CVE-2026-74582)

 * kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844)

 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 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_146_1 / kpatch-patch-5_14_0-427_84_1 packages based on the guidance in RHSA-2026:91639.

See Also

https://access.redhat.com/errata/RHSA-2026:91639

https://access.redhat.com/security/updates/classification/#important

https://bugzilla.redhat.com/show_bug.cgi?id=2485368

https://bugzilla.redhat.com/show_bug.cgi?id=2513233

https://bugzilla.redhat.com/show_bug.cgi?id=2517046

https://bugzilla.redhat.com/show_bug.cgi?id=2519475

https://bugzilla.redhat.com/show_bug.cgi?id=2528676

http://www.nessus.org/u?106d3b8b

Plugin Details

Severity: Critical

ID: 373594

File Name: redhat-RHSA-2026-91639.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/29/2026

Updated: 10/29/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9

Percentile: 99.76

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.3

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

CVSS Score Source: CVE-2026-74480

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.1

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:F/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_113_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_146_1, p-cpe:/a:redhat:enterprise_linux:kpatch-patch-5_14_0-427_84_1

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: 10/28/2026

Vulnerability Publication Date: 6/25/2026

CISA Known Exploited Vulnerability Due Dates: 9/21/2026

Reference Information

CVE: CVE-2026-53266, CVE-2026-68121, CVE-2026-74480, CVE-2026-74582, CVE-2026-80844

CWE: 805, 825

RHSA: 2026:91639