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Ubuntu 18.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8201-1)

high Nessus Plugin ID 309915

Synopsis

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

Description

The remote Ubuntu 18.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8201-1 advisory.

 Qualys discovered that several vulnerabilities existed in the AppArmor Linux kernel Security Module (LSM).
 An unprivileged local attacker could use these issues to load, replace, and remove arbitrary AppArmor profiles causing denial of service, exposure of sensitive information (kernel memory), local privilege escalation, or possibly escape a container. (LP: #2143853, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403, CVE-2026-23404, CVE-2026-23405, CVE-2026-23406, CVE-2026-23407, CVE-2026-23408, CVE-2026-23409, CVE-2026-23410, CVE-2026-23411)

 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:

 - ARM64 architecture;

 - x86 architecture;

 - Cryptographic API;

 - GPIO subsystem;

 - GPU drivers;

 - I2C subsystem;

 - BTRFS file system;

 - XFRM subsystem;

 - IPv4 networking;

 - IPv6 networking;

 - MAC80211 subsystem;

 - Network traffic control;

 - SMC sockets; (CVE-2021-47599, CVE-2022-48875, CVE-2022-49046, CVE-2022-49072, CVE-2024-46816, CVE-2024-49927, CVE-2024-56640, CVE-2025-21780, CVE-2025-37849, CVE-2025-40215, CVE-2026-23060, CVE-2026-23074)

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-8201-1

Plugin Details

Severity: High

ID: 309915

File Name: ubuntu_USN-8201-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/23/2026

Updated: 4/23/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

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-2026-23074

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:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.4.0-1161-azure

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/22/2026

Vulnerability Publication Date: 7/21/2021

Reference Information

CVE: CVE-2021-47599, CVE-2022-48875, CVE-2022-49046, CVE-2022-49072, CVE-2024-46816, CVE-2024-49927, CVE-2024-56640, CVE-2025-21780, CVE-2025-37849, CVE-2025-40215, CVE-2026-23060, CVE-2026-23074, CVE-2026-23268, CVE-2026-23269, CVE-2026-23403, CVE-2026-23404, CVE-2026-23405, CVE-2026-23406, CVE-2026-23407, CVE-2026-23409, CVE-2026-23410, CVE-2026-23411

USN: 8201-1