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Ubuntu 14.04 LTS / 18.04 LTS : Linux kernel vulnerability (USN-8390-1)

high Nessus Plugin ID 318845

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 14.04 LTS / 18.04 LTS host has a package installed that is affected by a vulnerability as referenced in the USN-8390-1 advisory.

 It was discovered that the Linux kernel did not properly handle shared page fragments during socket buffer operations, collectively known as Dirty Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the RxRPC networking subsystem when processing paged fragments. A local attacker could use this to escalate privileges, or possibly escape a container.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue 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-8390-1

Plugin Details

Severity: High

ID: 318845

File Name: ubuntu_USN-8390-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/5/2026

Updated: 6/5/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Critical

Score: 10.0

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.9

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

CVSS Score Source: CVE-2026-43284

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.5

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/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:14.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1202-azure, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-251-generic, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1175-kvm, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1155-oracle, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-251-lowlatency, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-2111-azure-fips, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1186-gcp, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-1148-fips, p-cpe:/a:canonical:ubuntu_linux:linux-image-4.15.0-2094-gcp-fips

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 6/4/2026

Vulnerability Publication Date: 5/8/2026

Reference Information

CVE: CVE-2026-43284

USN: 8390-1