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Linux Distros Unpatched Vulnerability : CVE-2026-6245
medium Nessus Plugin ID 306567
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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 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: 1.8
Type: Local
Agent: unix
Family: Misc.
Published: 4/15/2026
Updated: 5/6/2026
Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.0
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, cpe:/o:debian:debian_linux:11.0, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:redhat:enterprise_linux:python3-sss-murmur, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, 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_simpleifp-devel, p-cpe:/a:redhat:enterprise_linux:python-sss, p-cpe:/a:centos:centos:libsss_sudo-devel, cpe:/o:redhat:enterprise_linux:8, cpe:/o:debian:debian_linux:13.0, 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:debian:debian_linux:sssd, 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, cpe:/o:debian:debian_linux:12.0, 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, 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:canonical:ubuntu_linux:16.04:-:lts, cpe:/o:redhat:enterprise_linux:7, p-cpe:/a:centos:centos:libipa_hbac-python, p-cpe:/a:redhat:enterprise_linux:python-sssdconfig, cpe:/o:canonical:ubuntu_linux:26.04, 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:canonical:ubuntu_linux:sssd, 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, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:debian:debian_linux:14.0, 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, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:centos:centos:sssd-libwbclient, p-cpe:/a:centos:centos:python3-sss, cpe:/o:canonical:ubuntu_linux:18.04:-:lts
Required KB Items: Host/cpu, Host/local_checks_enabled, 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