RHEL 9 : kernel-rt (RHSA-2026:33900)

high Nessus Plugin ID 324080

Synopsis

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

Description

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:33900 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: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)

* kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)

* kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing (CVE-2026-43279)

* kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)

* kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)

* kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows (CVE-2026-43501)

* kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090)

* kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)

* kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)

Bug Fix(es) and Enhancement(s):

* [rhel-9] WARNING: possible recursive locking detected - vmd_enable_domain+0x757/0x910 (JIRA:RHEL-174467)

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: High

ID: 324080

File Name: redhat-RHSA-2026-33900.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 7/1/2026

Updated: 7/1/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.6

Percentile: 98.47

Vendor

Vendor Severity: Important

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2026-43128

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.8

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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:9.2, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules-extra, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-modules-core, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules

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: 7/1/2026

Vulnerability Publication Date: 4/7/2026

Reference Information

CVE: CVE-2026-31669, CVE-2026-43125, CVE-2026-43128, CVE-2026-43279, CVE-2026-43329, CVE-2026-43501, CVE-2026-46090, CVE-2026-46173, CVE-2026-46181

CWE: 130, 131, 1341, 364, 366, 763, 770, 787, 911

RHSA: 2026:33900

Detections

Analytics