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Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-8666-1)

critical Nessus Plugin ID 340684

Synopsis

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

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8666-1 advisory.

 Siebe Devroe, Hlose Gollier, and Mathy Vanhoef discovered that the WiFi implementation in the Linux kernel did not properly handle aggregated frames in mesh networks, due to an incorrect fix for CVE-2020-24588. A physically proximate attacker could use this issue to inject packets. (CVE-2025-27558)

 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:

 - x86 architecture;

 - Cryptographic API;

 - InfiniBand drivers;

 - Media drivers;

 - NVIDIA Tegra memory controller driver;

 - Network drivers;

 - NVME drivers;

 - File systems infrastructure;

 - Ext4 file system;

 - IPv4 networking;

 - Network traffic control;

 - TCP network protocol;

 - Locking primitives;

 - B.A.T.M.A.N. meshing protocol;

 - Ceph Core library;

 - IPv6 networking;

 - Multipath TCP;

 - Netfilter;

 - SCTP protocol;

 - SMC sockets;

 - TIPC protocol; (CVE-2021-47378, CVE-2026-23392, CVE-2026-31405, CVE-2026-31414, CVE-2026-31448, CVE-2026-31657, CVE-2026-31668, CVE-2026-43071, CVE-2026-43198, CVE-2026-43493, CVE-2026-43499, CVE-2026-46266, CVE-2026-46331, CVE-2026-52914, CVE-2026-52924, CVE-2026-52931, CVE-2026-52955, CVE-2026-52958, CVE-2026-52982, CVE-2026-52986, CVE-2026-52989, CVE-2026-52993, CVE-2026-52999, CVE-2026-53002, CVE-2026-53006, CVE-2026-53045, CVE-2026-53088, CVE-2026-53176, CVE-2026-53212, CVE-2026-53228, CVE-2026-53359)

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-8666-1

Plugin Details

Severity: Critical

ID: 340684

File Name: ubuntu_USN-8666-1.nasl

Version: 1.2

Type: Local

Agent: unix

Published: 8/26/2026

Updated: 8/27/2026

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: Critical

Score: 9.5

Percentile: 99.86

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 8.7

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

CVSS Score Source: CVE-2026-53228

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

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:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1066.69-iot, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1080.84-xilinx-zynqmp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1108.113-ibm, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1121.128-bluefield, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1145.158-raspi, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1160.170-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1162.173-aws, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1165.174-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1167.173-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-234.254-generic, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-234.254-lowlatency

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: 1/28/2022

Reference Information

CVE: CVE-2021-47378, CVE-2025-27558, CVE-2026-23392, CVE-2026-31405, CVE-2026-31414, CVE-2026-31448, CVE-2026-31657, CVE-2026-31668, CVE-2026-43071, CVE-2026-43198, CVE-2026-43493, CVE-2026-43499, CVE-2026-46266, CVE-2026-46331, CVE-2026-52914, CVE-2026-52924, CVE-2026-52931, CVE-2026-52955, CVE-2026-52958, CVE-2026-52982, CVE-2026-52986, CVE-2026-52989, CVE-2026-52993, CVE-2026-52999, CVE-2026-53002, CVE-2026-53006, CVE-2026-53045, CVE-2026-53088, CVE-2026-53176, CVE-2026-53212, CVE-2026-53228, CVE-2026-53359

USN: 8666-1