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Ubuntu 24.04 LTS / 25.10 / 26.04 LTS : SSSD vulnerability (USN-8355-1)

medium Nessus Plugin ID 320487

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8355-1 advisory.

 It was discovered that SSSD did not properly handle raw bytes in the PAM passkey responder. A local attacker could possibly use this issue to cause the SSSD PAM responder to crash, resulting in a denial of service.

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 packages.

See Also

https://ubuntu.com/security/notices/USN-8355-1

Plugin Details

Severity: Medium

ID: 320487

File Name: ubuntu_USN-8355-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/11/2026

Updated: 6/11/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-6245

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.8

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:sssd-ipa, p-cpe:/a:canonical:ubuntu_linux:libsss-certmap-dev, p-cpe:/a:canonical:ubuntu_linux:sssd-dbus, p-cpe:/a:canonical:ubuntu_linux:sssd-kcm, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:sssd-common, p-cpe:/a:canonical:ubuntu_linux:python3-sss, p-cpe:/a:canonical:ubuntu_linux:libsss-idmap0, p-cpe:/a:canonical:ubuntu_linux:libsss-idmap-dev, p-cpe:/a:canonical:ubuntu_linux:sssd-idp, p-cpe:/a:canonical:ubuntu_linux:libipa-hbac0t64, p-cpe:/a:canonical:ubuntu_linux:python3-libipa-hbac, p-cpe:/a:canonical:ubuntu_linux:libsss-nss-idmap-dev, p-cpe:/a:canonical:ubuntu_linux:sssd-tools, p-cpe:/a:canonical:ubuntu_linux:sssd, p-cpe:/a:canonical:ubuntu_linux:sssd-krb5-common, p-cpe:/a:canonical:ubuntu_linux:libnss-sss, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:sssd-ldap, p-cpe:/a:canonical:ubuntu_linux:sssd-krb5, p-cpe:/a:canonical:ubuntu_linux:sssd-passkey, p-cpe:/a:canonical:ubuntu_linux:libpam-sss, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libsss-nss-idmap0, p-cpe:/a:canonical:ubuntu_linux:sssd-proxy, p-cpe:/a:canonical:ubuntu_linux:sssd-ad-common, p-cpe:/a:canonical:ubuntu_linux:libsss-certmap0, p-cpe:/a:canonical:ubuntu_linux:libsss-sudo, p-cpe:/a:canonical:ubuntu_linux:python3-libsss-nss-idmap, p-cpe:/a:canonical:ubuntu_linux:sssd-ad, p-cpe:/a:canonical:ubuntu_linux:libipa-hbac-dev

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/1/2026

Vulnerability Publication Date: 4/15/2026

Reference Information

CVE: CVE-2026-6245

USN: 8355-1