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Ubuntu 20.04 LTS / 22.04 LTS / Pro Realtime 22.04 LTS : Linux kernel vulnerabilities (USN-8658-1)

critical Nessus Plugin ID 340685

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 20.04 LTS / 22.04 LTS / Pro Realtime 22.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8658-1 advisory.

 Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems:

 - Open vSwitch;

 - SCTP protocol; (CVE-2026-53224, CVE-2026-53246, CVE-2026-64531)

Tenable has extracted the preceding description block directly from the Ubuntu 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 kernel package.

See Also

https://ubuntu.com/security/notices/USN-8658-1

Plugin Details

Severity: Critical

ID: 340685

File Name: ubuntu_USN-8658-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/26/2026

Updated: 8/26/2026

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

Risk Information

VPR

Risk Factor: High

Score: 7.9

Percentile: 99.36

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.8

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

CVSS Score Source: CVE-2026-53246

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1066.68-nvidia-tegra-rt, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1066.68-nvidia-tegra, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1077.81-xilinx-zynqmp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1097.105-gkeop, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1106.108-intel-iot-realtime, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1106.111-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1109.110-nvidia-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1109.110-nvidia, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1109.115-intel-iotg, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1111.117-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1113.122-realtime, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1114.121-aws-64k, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1114.121-aws

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/20/2026

Vulnerability Publication Date: 6/25/2026

Reference Information

CVE: CVE-2026-53224, CVE-2026-53246, CVE-2026-64531

USN: 8658-1