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Ubuntu 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS : p11-kit vulnerabilities (USN-8687-1)

medium Nessus Plugin ID 365415

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 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8687-1 advisory.

 It was discovered that p11-kit incorrectly handled certain RPC messages. A local attacker could use this issue to cause p11-kit to crash, resulting in a denial of service. (CVE-2026-13757)

 It was discovered that p11-kit incorrectly handled nested attribute decoding on 32-bit systems. A local attacker could use this issue to cause p11-kit to crash, resulting in a denial of service.
 (CVE-2026-18938)

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 libp11-kit0, p11-kit and / or p11-kit-modules packages.

See Also

https://ubuntu.com/security/notices/USN-8687-1

Plugin Details

Severity: Medium

ID: 365415

File Name: ubuntu_USN-8687-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/13/2026

Updated: 10/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.77

CVSS v2

Risk Factor: Medium

Base Score: 4.9

Temporal Score: 3.6

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

CVSS Score Source: CVE-2026-18938

CVSS v3

Risk Factor: Medium

Base Score: 6.2

Temporal Score: 5.4

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:18.04:-:lts, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libp11-kit0, p-cpe:/a:canonical:ubuntu_linux:p11-kit-modules, p-cpe:/a:canonical:ubuntu_linux:p11-kit

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/27/2026

Vulnerability Publication Date: 6/29/2026

Reference Information

CVE: CVE-2026-13757, CVE-2026-18938

USN: 8687-1