Linux Distros Unpatched Vulnerability : CVE-2026-104036

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

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  script_version("1.1");
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  script_cve_id("CVE-2026-104036");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-104036");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"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 SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin
    detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local
    attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached
    entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by
    crashing the identity mapping service, and may also corrupt adjacent process memory. (CVE-2026-104036)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2026-104036");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
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  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/06");

  script_set_attribute(attribute:"plugin_type", value:"local");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libsss_autofs");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libsss_certmap-devel");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:sssd-polkit-rules");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:sssd-proxy");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libipa_hbac-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsss_autofs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libsss_certmap");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "libipa_hbac"},
          {"reference": "libsss_autofs"},
          {"reference": "libsss_certmap"},
          {"reference": "libsss_idmap"},
          {"reference": "libsss_nss_idmap"},
          {"reference": "libsss_nss_idmap-devel"},
          {"reference": "libsss_sudo"},
          {"reference": "python3-libipa_hbac"},
          {"reference": "python3-libsss_nss_idmap"},
          {"reference": "python3-sss"},
          {"reference": "python3-sss-murmur"},
          {"reference": "python3-sssdconfig"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-client"},
          {"reference": "sssd-common"},
          {"reference": "sssd-common-pac"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-nfs-idmap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "sssd-winbind-idmap"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "libipa_hbac"},
          {"reference": "libipa_hbac-devel"},
          {"reference": "libipa_hbac-python"},
          {"reference": "libsss_autofs"},
          {"reference": "libsss_certmap"},
          {"reference": "libsss_certmap-devel"},
          {"reference": "libsss_idmap"},
          {"reference": "libsss_idmap-devel"},
          {"reference": "libsss_nss_idmap"},
          {"reference": "libsss_nss_idmap-devel"},
          {"reference": "libsss_nss_idmap-python"},
          {"reference": "libsss_simpleifp"},
          {"reference": "libsss_simpleifp-devel"},
          {"reference": "libsss_sudo"},
          {"reference": "python-libipa_hbac"},
          {"reference": "python-libsss_nss_idmap"},
          {"reference": "python-sss"},
          {"reference": "python-sss-murmur"},
          {"reference": "python-sssdconfig"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-client"},
          {"reference": "sssd-common"},
          {"reference": "sssd-common-pac"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-libwbclient"},
          {"reference": "sssd-libwbclient-devel"},
          {"reference": "sssd-polkit-rules"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "sssd-winbind-idmap"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "libipa_hbac"},
          {"reference": "libipa_hbac-devel"},
          {"reference": "libipa_hbac-python"},
          {"reference": "libsss_autofs"},
          {"reference": "libsss_certmap"},
          {"reference": "libsss_certmap-devel"},
          {"reference": "libsss_idmap"},
          {"reference": "libsss_idmap-devel"},
          {"reference": "libsss_nss_idmap"},
          {"reference": "libsss_nss_idmap-devel"},
          {"reference": "libsss_nss_idmap-python"},
          {"reference": "libsss_simpleifp"},
          {"reference": "libsss_simpleifp-devel"},
          {"reference": "libsss_sudo"},
          {"reference": "python-libipa_hbac"},
          {"reference": "python-libsss_nss_idmap"},
          {"reference": "python-sss"},
          {"reference": "python-sss-murmur"},
          {"reference": "python-sssdconfig"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-client"},
          {"reference": "sssd-common"},
          {"reference": "sssd-common-pac"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-libwbclient"},
          {"reference": "sssd-libwbclient-devel"},
          {"reference": "sssd-polkit-rules"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "sssd-winbind-idmap"}
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    ]
  },
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    "package_manager": "rpm-list",
    "constraints": [
      {
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        "pkgs": [
          {"reference": "libipa_hbac"},
          {"reference": "libsss_autofs"},
          {"reference": "libsss_certmap"},
          {"reference": "libsss_idmap"},
          {"reference": "libsss_nss_idmap"},
          {"reference": "libsss_nss_idmap-devel"},
          {"reference": "libsss_simpleifp"},
          {"reference": "libsss_sudo"},
          {"reference": "python3-libipa_hbac"},
          {"reference": "python3-libsss_nss_idmap"},
          {"reference": "python3-sss"},
          {"reference": "python3-sss-murmur"},
          {"reference": "python3-sssdconfig"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-client"},
          {"reference": "sssd-common"},
          {"reference": "sssd-common-pac"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-libwbclient"},
          {"reference": "sssd-nfs-idmap"},
          {"reference": "sssd-polkit-rules"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "sssd-winbind-idmap"}
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    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "libipa_hbac"},
          {"reference": "libsss_autofs"},
          {"reference": "libsss_certmap"},
          {"reference": "libsss_idmap"},
          {"reference": "libsss_nss_idmap"},
          {"reference": "libsss_nss_idmap-devel"},
          {"reference": "libsss_simpleifp"},
          {"reference": "libsss_sudo"},
          {"reference": "python3-libipa_hbac"},
          {"reference": "python3-libsss_nss_idmap"},
          {"reference": "python3-sss"},
          {"reference": "python3-sss-murmur"},
          {"reference": "python3-sssdconfig"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-client"},
          {"reference": "sssd-common"},
          {"reference": "sssd-common-pac"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-libwbclient"},
          {"reference": "sssd-nfs-idmap"},
          {"reference": "sssd-polkit-rules"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "sssd-winbind-idmap"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "libipa_hbac"},
          {"reference": "libsss_autofs"},
          {"reference": "libsss_certmap"},
          {"reference": "libsss_certmap-devel"},
          {"reference": "libsss_idmap"},
          {"reference": "libsss_idmap-devel"},
          {"reference": "libsss_nss_idmap"},
          {"reference": "libsss_nss_idmap-devel"},
          {"reference": "libsss_simpleifp"},
          {"reference": "libsss_sudo"},
          {"reference": "python3-libipa_hbac"},
          {"reference": "python3-libsss_nss_idmap"},
          {"reference": "python3-sss"},
          {"reference": "python3-sss-murmur"},
          {"reference": "python3-sssdconfig"},
          {"reference": "sssd"},
          {"reference": "sssd-ad"},
          {"reference": "sssd-client"},
          {"reference": "sssd-common"},
          {"reference": "sssd-common-pac"},
          {"reference": "sssd-dbus"},
          {"reference": "sssd-idp"},
          {"reference": "sssd-ipa"},
          {"reference": "sssd-kcm"},
          {"reference": "sssd-krb5"},
          {"reference": "sssd-krb5-common"},
          {"reference": "sssd-ldap"},
          {"reference": "sssd-nfs-idmap"},
          {"reference": "sssd-passkey"},
          {"reference": "sssd-polkit-rules"},
          {"reference": "sssd-proxy"},
          {"reference": "sssd-tools"},
          {"reference": "sssd-winbind-idmap"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');

var third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}