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Ubuntu 20.04 LTS : Linux kernel (Oracle) vulnerabilities (USN-8439-1)

critical Nessus Plugin ID 321368

Synopsis

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

Description

The remote Ubuntu 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8439-1 advisory.

 Stonejiajia, Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in the Ubuntu Linux kernel did not properly perform permission checks in certain situations. A local attacker could possibly use this to gain elevated privileges. (CVE-2023-2640)

 Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in the Ubuntu Linux kernel did not properly perform permission checks in certain situations. A local attacker could possibly use this to gain elevated privileges. (CVE-2023-32629)

 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:

 - Network drivers;

 - NVME drivers;

 - SMB network file system;

 - Netfilter;

 - io_uring subsystem; (CVE-2024-35862, CVE-2024-50060, CVE-2026-23112, CVE-2026-23273, CVE-2026-23274, CVE-2026-23351)

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-8439-1

Plugin Details

Severity: Critical

ID: 321368

File Name: ubuntu_USN-8439-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/17/2026

Updated: 6/17/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 9.6

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-2026-23112

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:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-5.15.0-1104-oracle

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: 6/16/2026

Vulnerability Publication Date: 7/26/2023

Reference Information

CVE: CVE-2023-2640, CVE-2023-32629, CVE-2024-35862, CVE-2024-50060, CVE-2026-23112, CVE-2026-23273, CVE-2026-23274, CVE-2026-23351

USN: 8439-1