RHEL 8 : kernel-rt (RHSA-2026:89082)

medium Nessus Plugin ID 372141

Synopsis

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

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:89082 advisory.

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: tcp: restrict SO_ATTACH_FILTER to priv users (CVE-2026-53236)

* kernel: fuse: re-lock request before replacing page cache folio (CVE-2026-53388)

* kernel: writeback: fix race between cgroup_writeback_umount() and inode_switch_wbs() (CVE-2026-64378)

* kernel: net: gro: fix double aggregation of flush-marked skbs (CVE-2026-68136)

* kernel: net/packet: avoid fanout hook re-registration after unregister (CVE-2026-68338)

* kernel: net/iucv: fix use-after-free of a severed iucv_path (CVE-2026-68140)

* kernel: net/sched: serialize qdisc_rtab_list against concurrent get/put (CVE-2026-68138)

* kernel: ipvs: reload ip header after head reallocation (CVE-2026-68476)

* kernel: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() (CVE-2026-72242)

* kernel: mptcp: options: reset DSS fields in case of unexpected size (CVE-2026-80586)

* kernel: usb: usbfs: fix use-after-free of usb_device in usbdev_release() (CVE-2026-80824)

* kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions (CVE-2026-89638)

* kernel: net/iucv: filter frames in afiucv_hs_rcv() by ingress device (CVE-2026-81003)

* kernel: ipv4: validate checksum_start before completing checksum (CVE-2026-99999)

Bug Fix(es) and Enhancement(s):

* Backport 6785011f8b16 (ipv4: validate checksum_start before completing checksum) [rhel-8.10.z] (JIRA:RHEL-280584)

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 affected packages.

Plugin Details

Severity: Medium

ID: 372141

File Name: redhat-RHSA-2026-89082.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 10/26/2026

Updated: 10/26/2026

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: High

Score: 8

Percentile: 99.69

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.6

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

CVSS Score Source: CVE-2026-53236

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

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

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

Vulnerability Information

CPE: cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:rhel_eus:8.10, p-cpe:/a:redhat:enterprise_linux:kernel-rt-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug, p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules, p-cpe:/a:redhat:enterprise_linux:kernel-rt

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: 10/24/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53236, CVE-2026-53388, CVE-2026-64378, CVE-2026-68136, CVE-2026-68138, CVE-2026-68140, CVE-2026-68338, CVE-2026-68476, CVE-2026-72242, CVE-2026-80586, CVE-2026-80824, CVE-2026-81003, CVE-2026-89638, CVE-2026-99999

CWE: 266, 281, 364, 367, 476, 787, 824, 825, 940

RHSA: 2026:89082

Detections

Analytics