Linux Distros Unpatched Vulnerability : CVE-2026-90463

medium Nessus Plugin ID 345667

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

- A flaw was found in the sssd NSS responder. This input validation vulnerability allows a local attacker, by sending specially crafted service lookup requests to the NSS responder's UNIX socket, to cause an out- of-bounds read. This out-of-bounds read may lead to a denial of service (DoS) by crashing the NSS responder process. While unprivileged local clients can typically reach the socket, there is no evidence of privilege escalation or reliable data disclosure. (CVE-2026-90463)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

Plugin Details

Severity: Medium

ID: 345667

File Name: unpatched_CVE_2026_90463.nasl

Version: 1.3

Type: Local

Agent: unix

Family: Misc.

Published: 9/14/2026

Updated: 9/15/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 3.6

Temporal Score: 3.1

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

CVSS Score Source: CVE-2026-90463

CVSS v3

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.7

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

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

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:16.04:-:lts, 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, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:centos:centos:7, cpe:/o:centos:centos:8, cpe:/o:debian:debian_linux:12.0, cpe:/o:debian:debian_linux:13.0, cpe:/o:redhat:enterprise_linux:10, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:canonical:ubuntu_linux:sssd, p-cpe:/a:centos:centos:libipa_hbac-devel, p-cpe:/a:centos:centos:libipa_hbac-python, p-cpe:/a:centos:centos:libipa_hbac, p-cpe:/a:centos:centos:libsss_autofs, p-cpe:/a:centos:centos:libsss_certmap-devel, p-cpe:/a:centos:centos:libsss_certmap, p-cpe:/a:centos:centos:libsss_idmap-devel, p-cpe:/a:centos:centos:libsss_idmap, p-cpe:/a:centos:centos:libsss_nss_idmap-devel, p-cpe:/a:centos:centos:libsss_nss_idmap-python, p-cpe:/a:centos:centos:libsss_nss_idmap, p-cpe:/a:centos:centos:libsss_simpleifp-devel, p-cpe:/a:centos:centos:libsss_simpleifp, p-cpe:/a:centos:centos:libsss_sudo, p-cpe:/a:centos:centos:python-libipa_hbac, p-cpe:/a:centos:centos:python-libsss_nss_idmap, p-cpe:/a:centos:centos:python-sss-murmur, p-cpe:/a:centos:centos:python-sss, p-cpe:/a:centos:centos:python-sssdconfig, p-cpe:/a:centos:centos:python3-libipa_hbac, p-cpe:/a:centos:centos:python3-libsss_nss_idmap, p-cpe:/a:centos:centos:python3-sss-murmur, p-cpe:/a:centos:centos:python3-sss, p-cpe:/a:centos:centos:python3-sssdconfig, p-cpe:/a:centos:centos:sssd-ad, p-cpe:/a:centos:centos:sssd-client, p-cpe:/a:centos:centos:sssd-common-pac, p-cpe:/a:centos:centos:sssd-common, p-cpe:/a:centos:centos:sssd-dbus, p-cpe:/a:centos:centos:sssd-idp, p-cpe:/a:centos:centos:sssd-ipa, p-cpe:/a:centos:centos:sssd-kcm, p-cpe:/a:centos:centos:sssd-krb5-common, p-cpe:/a:centos:centos:sssd-krb5, p-cpe:/a:centos:centos:sssd-ldap, p-cpe:/a:centos:centos:sssd-libwbclient-devel, p-cpe:/a:centos:centos:sssd-libwbclient, p-cpe:/a:centos:centos:sssd-nfs-idmap, p-cpe:/a:centos:centos:sssd-passkey, p-cpe:/a:centos:centos:sssd-polkit-rules, p-cpe:/a:centos:centos:sssd-proxy, p-cpe:/a:centos:centos:sssd-tools, p-cpe:/a:centos:centos:sssd-winbind-idmap, p-cpe:/a:centos:centos:sssd, p-cpe:/a:debian:debian_linux:sssd, p-cpe:/a:redhat:enterprise_linux:libipa_hbac-devel, p-cpe:/a:redhat:enterprise_linux:libipa_hbac-python, p-cpe:/a:redhat:enterprise_linux:libipa_hbac, p-cpe:/a:redhat:enterprise_linux:libsss_autofs, p-cpe:/a:redhat:enterprise_linux:libsss_certmap-devel, p-cpe:/a:redhat:enterprise_linux:libsss_certmap, p-cpe:/a:redhat:enterprise_linux:libsss_idmap-devel, p-cpe:/a:redhat:enterprise_linux:libsss_idmap, p-cpe:/a:redhat:enterprise_linux:libsss_nss_idmap-devel, p-cpe:/a:redhat:enterprise_linux:libsss_nss_idmap-python, p-cpe:/a:redhat:enterprise_linux:libsss_nss_idmap, p-cpe:/a:redhat:enterprise_linux:libsss_simpleifp-devel, p-cpe:/a:redhat:enterprise_linux:libsss_simpleifp, p-cpe:/a:redhat:enterprise_linux:libsss_sudo, p-cpe:/a:redhat:enterprise_linux:python-libipa_hbac, p-cpe:/a:redhat:enterprise_linux:python-libsss_nss_idmap, p-cpe:/a:redhat:enterprise_linux:python-sss-murmur, p-cpe:/a:redhat:enterprise_linux:python-sss, p-cpe:/a:redhat:enterprise_linux:python-sssdconfig, p-cpe:/a:redhat:enterprise_linux:python3-libipa_hbac, p-cpe:/a:redhat:enterprise_linux:python3-libsss_nss_idmap, p-cpe:/a:redhat:enterprise_linux:python3-sss-murmur, p-cpe:/a:redhat:enterprise_linux:python3-sss, p-cpe:/a:redhat:enterprise_linux:python3-sssdconfig, p-cpe:/a:redhat:enterprise_linux:sssd-ad, p-cpe:/a:redhat:enterprise_linux:sssd-client, p-cpe:/a:redhat:enterprise_linux:sssd-common-pac, p-cpe:/a:redhat:enterprise_linux:sssd-common, p-cpe:/a:redhat:enterprise_linux:sssd-dbus, p-cpe:/a:redhat:enterprise_linux:sssd-idp, p-cpe:/a:redhat:enterprise_linux:sssd-ipa, p-cpe:/a:redhat:enterprise_linux:sssd-kcm, p-cpe:/a:redhat:enterprise_linux:sssd-krb5-common, p-cpe:/a:redhat:enterprise_linux:sssd-krb5, p-cpe:/a:redhat:enterprise_linux:sssd-ldap, p-cpe:/a:redhat:enterprise_linux:sssd-libwbclient-devel, p-cpe:/a:redhat:enterprise_linux:sssd-libwbclient, p-cpe:/a:redhat:enterprise_linux:sssd-nfs-idmap, p-cpe:/a:redhat:enterprise_linux:sssd-passkey, p-cpe:/a:redhat:enterprise_linux:sssd-polkit-rules, p-cpe:/a:redhat:enterprise_linux:sssd-proxy, p-cpe:/a:redhat:enterprise_linux:sssd-tools, p-cpe:/a:redhat:enterprise_linux:sssd-winbind-idmap, p-cpe:/a:redhat:enterprise_linux:sssd

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/14/2026

Reference Information

CVE: CVE-2026-90463

Detections

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