RHEL 8 : kernel-rt (RHSA-2026:68532)

medium Nessus Plugin ID 346857

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Synopsis

The remote Red Hat host is missing one or more security updates for kernel-rt.

Description

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:68532 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: ipvlan: Make the addrs_lock be per port (CVE-2026-23103)

* kernel: xfrm: hold dev ref until after transport_finish NF_HOOK (CVE-2026-31663)

* kernel: netfilter: nf_conntrack_h323: fix OOB read in decode_choice() (CVE-2026-43233)

* kernel: ipv6: prevent possible UaF in addrconf_permanent_addr() (CVE-2026-43339)

* kernel: inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP (CVE-2026-46266)

* kernel: flow_dissector: do not dissect PPPoE PFC frames (CVE-2026-46306)

* kernel: netfilter: xt_policy: fix strict mode inbound policy matching (CVE-2026-52920)

* kernel: ppp: require CAP_NET_ADMIN in target netns for unattached ioctls (CVE-2026-53075)

* kernel: ipv6: sit: reload inner IPv6 header after GSO offloads (CVE-2026-53228)

* kernel: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN (CVE-2026-53176)

* kernel: netfilter: require Ethernet MAC header before using eth_hdr() (CVE-2026-53131)

* kernel: netfilter: conntrack_irc: fix possible out-of-bounds read (CVE-2026-53268)

* kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() (CVE-2026-53239)

* kernel: ALSA: timer: Fix UAF at snd_timer_user_params() (CVE-2026-53192)

* kernel: net: guard timestamp cmsgs to real error queue skbs (CVE-2026-53223)

* kernel: ipv6: mcast: Fix use-after-free when processing MLD queries (CVE-2026-53275)

* kernel: ipv4: free net->ipv4.sysctl_local_reserved_ports after unregister_net_sysctl_table() (CVE-2026-64002)

* kernel: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate() (CVE-2026-63921)

* kernel: xfrm: input: hold netns during deferred transport reinjection (CVE-2026-63919)

* kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink() (CVE-2026-63917)

* kernel: Linux kernel SLIP: Out-of-bounds write due to race condition during MTU change (CVE-2026-68143)

* kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment (CVE-2026-68426)

* kernel: net: qrtr: fix 32-bit integer overflow in qrtr_endpoint_post() (CVE-2026-72298)

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 kernel-rt package based on the guidance in RHSA-2026:68532.

Plugin Details

Severity: Medium

ID: 346857

File Name: redhat-RHSA-2026-68532.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Red Hat Local Security Checks

Published: 9/17/2026

Updated: 9/17/2026

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: 7.8

Percentile: 99.33

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-2026-23103

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: 9/17/2026

Vulnerability Publication Date: 2/4/2026

Reference Information

CVE: CVE-2026-23103, CVE-2026-31663, CVE-2026-43233, CVE-2026-43339, CVE-2026-46266, CVE-2026-46306, CVE-2026-52920, CVE-2026-53075, CVE-2026-53131, CVE-2026-53176, CVE-2026-53192, CVE-2026-53223, CVE-2026-53228, CVE-2026-53239, CVE-2026-53268, CVE-2026-53275, CVE-2026-63917, CVE-2026-63919, CVE-2026-63921, CVE-2026-64002, CVE-2026-68143, CVE-2026-68426, CVE-2026-72298

CWE: 125, 1287, 131, 266, 364, 413, 551, 653, 787, 825, 826, 839, 843, 911

RHSA: 2026:68532

Detections

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