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Linux Distros Unpatched Vulnerability : CVE-2026-6245

medium Nessus Plugin ID 306567

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 System Security Services Daemon (SSSD). The pam_passkey_child_read_data() function within the PAM passkey responder fails to properly handle raw bytes received from a pipe. Because the data is treated as a NUL-terminated C string without explicit termination, it results in an out-of-bounds read when processed by functions like snprintf(). A local attacker could potentially trigger this vulnerability by initiating a crafted passkey authentication request, causing the SSSD PAM responder to crash, resulting in a local Denial of Service (DoS). (CVE-2026-6245)

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

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-6245

Plugin Details

Severity: Medium

ID: 306567

File Name: unpatched_CVE_2026_6245.nasl

Version: 1.2

Type: Local

Agent: unix

Family: Misc.

Published: 4/15/2026

Updated: 4/16/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4.6

Temporal Score: 3.9

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: 5.1

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:U/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:libipa_hbac-python, p-cpe:/a:redhat:enterprise_linux:python3-sss-murmur, p-cpe:/a:redhat:enterprise_linux:libsss_nss_idmap-devel, p-cpe:/a:redhat:enterprise_linux:sssd-idp, p-cpe:/a:centos:centos:python-libipa_hbac, cpe:/o:redhat:enterprise_linux:6, p-cpe:/a:redhat:enterprise_linux:sssd-client, p-cpe:/a:redhat:enterprise_linux:libsss_idmap, p-cpe:/a:redhat:enterprise_linux:python-libipa_hbac, p-cpe:/a:redhat:enterprise_linux:libipa_hbac-devel, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:centos:centos:sssd-krb5, p-cpe:/a:centos:centos:libsss_idmap, p-cpe:/a:redhat:enterprise_linux:libsss_sudo, cpe:/o:redhat:enterprise_linux:10, p-cpe:/a:centos:centos:sssd-common-pac, p-cpe:/a:centos:centos:sssd-ipa, p-cpe:/a:centos:centos:sssd-nfs-idmap, p-cpe:/a:redhat:enterprise_linux:python3-sssdconfig, p-cpe:/a:centos:centos:sssd-ad, p-cpe:/a:centos:centos:sssd-passkey, p-cpe:/a:redhat:enterprise_linux:sssd-nfs-idmap, p-cpe:/a:centos:centos:libsss_autofs, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:centos:centos:libipa_hbac-python, p-cpe:/a:redhat:enterprise_linux:python-sssdconfig, p-cpe:/a:redhat:enterprise_linux:sssd-winbind-idmap, p-cpe:/a:redhat:enterprise_linux:sssd-kcm, p-cpe:/a:centos:centos:libsss_certmap-devel, p-cpe:/a:redhat:enterprise_linux:sssd-libwbclient, p-cpe:/a:redhat:enterprise_linux:python3-sss, p-cpe:/a:redhat:enterprise_linux:sssd-proxy, p-cpe:/a:centos:centos:sssd-polkit-rules, p-cpe:/a:centos:centos:sssd, p-cpe:/a:centos:centos:libsss_nss_idmap-devel, p-cpe:/a:centos:centos:python-sssdconfig, p-cpe:/a:centos:centos:sssd-tools, p-cpe:/a:redhat:enterprise_linux:sssd-libwbclient-devel, p-cpe:/a:centos:centos:python3-sss-murmur, p-cpe:/a:centos:centos:libsss_nss_idmap-python, p-cpe:/a:redhat:enterprise_linux:sssd-polkit-rules, p-cpe:/a:centos:centos:python3-libipa_hbac, p-cpe:/a:redhat:enterprise_linux:sssd-common-pac, p-cpe:/a:centos:centos:libsss_simpleifp, p-cpe:/a:redhat:enterprise_linux:sssd-tools, p-cpe:/a:redhat:enterprise_linux:libsss_certmap-devel, p-cpe:/a:centos:centos:python3-sssdconfig, p-cpe:/a:centos:centos:sssd-krb5-common, p-cpe:/a:redhat:enterprise_linux:sssd-ad, p-cpe:/a:centos:centos:libipa_hbac, p-cpe:/a:centos:centos:libsss_nss_idmap, p-cpe:/a:redhat:enterprise_linux:python-libsss_nss_idmap, p-cpe:/a:centos:centos:sssd-kcm, p-cpe:/a:centos:centos:sssd-libwbclient, p-cpe:/a:centos:centos:python3-sss, p-cpe:/a:redhat:enterprise_linux:libsss_simpleifp-devel, p-cpe:/a:redhat:enterprise_linux:python-sss, p-cpe:/a:centos:centos:libsss_sudo-devel, cpe:/o:redhat:enterprise_linux:8, p-cpe:/a:centos:centos:sssd-client, p-cpe:/a:redhat:enterprise_linux:libsss_nss_idmap, p-cpe:/a:centos:centos:sssd-libwbclient-devel, p-cpe:/a:redhat:enterprise_linux:sssd, p-cpe:/a:redhat:enterprise_linux:libsss_sudo-devel, p-cpe:/a:centos:centos:libipa_hbac-devel, p-cpe:/a:centos:centos:sssd-proxy, p-cpe:/a:redhat:enterprise_linux:python3-libipa_hbac, cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:sssd-winbind-idmap, p-cpe:/a:redhat:enterprise_linux:libipa_hbac, p-cpe:/a:redhat:enterprise_linux:python3-libsss_nss_idmap, p-cpe:/a:redhat:enterprise_linux:sssd-krb5, p-cpe:/a:redhat:enterprise_linux:python-sss-murmur, p-cpe:/a:centos:centos:python-sss, p-cpe:/a:redhat:enterprise_linux:sssd-dbus, p-cpe:/a:redhat:enterprise_linux:libsss_simpleifp, p-cpe:/a:redhat:enterprise_linux:sssd-common, p-cpe:/a:centos:centos:sssd-idp, p-cpe:/a:redhat:enterprise_linux:sssd-ipa, p-cpe:/a:redhat:enterprise_linux:libsss_idmap-devel, p-cpe:/a:centos:centos:python-libsss_nss_idmap, p-cpe:/a:centos:centos:python3-libsss_nss_idmap, p-cpe:/a:centos:centos:libsss_certmap, p-cpe:/a:centos:centos:libsss_idmap-devel, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:libsss_simpleifp-devel, p-cpe:/a:redhat:enterprise_linux:libsss_certmap, p-cpe:/a:centos:centos:sssd-dbus, p-cpe:/a:redhat:enterprise_linux:sssd-passkey, p-cpe:/a:centos:centos:sssd-common, p-cpe:/a:redhat:enterprise_linux:sssd-ldap, p-cpe:/a:redhat:enterprise_linux:libsss_nss_idmap-python, p-cpe:/a:centos:centos:sssd-ldap, p-cpe:/a:centos:centos:python-sss-murmur, p-cpe:/a:centos:centos:libsss_sudo, p-cpe:/a:redhat:enterprise_linux:sssd-krb5-common, p-cpe:/a:redhat:enterprise_linux:libsss_autofs

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: 4/15/2026

Reference Information

CVE: CVE-2026-6245