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Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Nano vulnerabilities (USN-8386-1)

low Nessus Plugin ID 318839

Synopsis

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

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8386-1 advisory.

 Micha Majchrowicz and Marcin Wyczechowski discovered that Nano created the ~/.local directory with incorrect permissions. In environments with permissive umask settings, a local attacker could possibly use this issue to inject a malicious launcher file, resulting in information disclosure or other unintended actions. (CVE-2026-6842)

 Micha Majchrowicz and Marcin Wyczechowski discovered that Nano incorrectly handled directory names when updating the status line. A local attacker could possibly use this issue to cause Nano to crash, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-6843)

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 nano and / or nano-tiny packages.

See Also

https://ubuntu.com/security/notices/USN-8386-1

Plugin Details

Severity: Low

ID: 318839

File Name: ubuntu_USN-8386-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/5/2026

Updated: 6/5/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Low

Base Score: 1

Temporal Score: 0.7

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

CVSS Score Source: CVE-2026-6842

CVSS v3

Risk Factor: Low

Base Score: 2.5

Temporal Score: 2.2

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:nano-tiny, p-cpe:/a:canonical:ubuntu_linux:nano, cpe:/o:canonical:ubuntu_linux:26.04:-:lts

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/4/2026

Vulnerability Publication Date: 4/22/2026

Reference Information

CVE: CVE-2026-6842, CVE-2026-6843

IAVA: 2026-A-0513

USN: 8386-1