Linux Distros Unpatched Vulnerability : CVE-2026-78367

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

include('compat.inc');

if (description)
{
  script_id(339157);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/24");

  script_cve_id("CVE-2026-78367");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-78367");

  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 vulnerability was found in RPM's rpmbuild tarball processing. When processing a crafted source archive,
    the getTarSpec() function in tools/rpmbuild.cc passes an attacker-controlled tar archive member name to
    rpmExpand() as part of a %{basename:...} macro expression. A specially crafted .spec member name can
    therefore inject RPM macros, including Lua expressions, resulting in arbitrary code execution with the
    privileges of the user running rpmbuild. This can be exploited when a victim or automated build system
    processes an attacker-controlled source tarball using rpmbuild tarball mode (such as -ts, -ta, or -tb).
    (CVE-2026-78367)

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-2026-78367");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-78367");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/24");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/24");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:9");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-rpm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-apidocs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-build");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-build-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-cron");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-audit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-dbus-announce");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-fapolicyd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-ima");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-prioreset");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-selinux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-syslog");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-plugin-systemd-inhibit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-sign");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rpm-sign-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:python3-rpm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-apidocs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-build");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-build-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-cron");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-audit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-dbus-announce");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-fapolicyd");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-ima");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-prioreset");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-selinux");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-syslog");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-plugin-systemd-inhibit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-sign");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rpm-sign-libs");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  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": "python3-rpm"},
          {"reference": "rpm"},
          {"reference": "rpm-apidocs"},
          {"reference": "rpm-build"},
          {"reference": "rpm-build-libs"},
          {"reference": "rpm-cron"},
          {"reference": "rpm-devel"},
          {"reference": "rpm-libs"},
          {"reference": "rpm-plugin-audit"},
          {"reference": "rpm-plugin-dbus-announce"},
          {"reference": "rpm-plugin-fapolicyd"},
          {"reference": "rpm-plugin-ima"},
          {"reference": "rpm-plugin-selinux"},
          {"reference": "rpm-plugin-syslog"},
          {"reference": "rpm-plugin-systemd-inhibit"},
          {"reference": "rpm-sign"},
          {"reference": "rpm-sign-libs"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "rpm"},
          {"reference": "rpm-apidocs"},
          {"reference": "rpm-build"},
          {"reference": "rpm-build-libs"},
          {"reference": "rpm-cron"},
          {"reference": "rpm-devel"},
          {"reference": "rpm-libs"},
          {"reference": "rpm-plugin-systemd-inhibit"},
          {"reference": "rpm-python"},
          {"reference": "rpm-sign"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "rpm"},
          {"reference": "rpm-apidocs"},
          {"reference": "rpm-build"},
          {"reference": "rpm-build-libs"},
          {"reference": "rpm-cron"},
          {"reference": "rpm-devel"},
          {"reference": "rpm-libs"},
          {"reference": "rpm-plugin-systemd-inhibit"},
          {"reference": "rpm-python"},
          {"reference": "rpm-sign"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "python3-rpm"},
          {"reference": "rpm"},
          {"reference": "rpm-apidocs"},
          {"reference": "rpm-build"},
          {"reference": "rpm-build-libs"},
          {"reference": "rpm-cron"},
          {"reference": "rpm-devel"},
          {"reference": "rpm-libs"},
          {"reference": "rpm-plugin-fapolicyd"},
          {"reference": "rpm-plugin-ima"},
          {"reference": "rpm-plugin-prioreset"},
          {"reference": "rpm-plugin-selinux"},
          {"reference": "rpm-plugin-syslog"},
          {"reference": "rpm-plugin-systemd-inhibit"},
          {"reference": "rpm-sign"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "python3-rpm"},
          {"reference": "rpm"},
          {"reference": "rpm-apidocs"},
          {"reference": "rpm-build"},
          {"reference": "rpm-build-libs"},
          {"reference": "rpm-cron"},
          {"reference": "rpm-devel"},
          {"reference": "rpm-libs"},
          {"reference": "rpm-plugin-fapolicyd"},
          {"reference": "rpm-plugin-ima"},
          {"reference": "rpm-plugin-prioreset"},
          {"reference": "rpm-plugin-selinux"},
          {"reference": "rpm-plugin-syslog"},
          {"reference": "rpm-plugin-systemd-inhibit"},
          {"reference": "rpm-sign"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "python3-rpm"},
          {"reference": "rpm"},
          {"reference": "rpm-apidocs"},
          {"reference": "rpm-build"},
          {"reference": "rpm-build-libs"},
          {"reference": "rpm-cron"},
          {"reference": "rpm-devel"},
          {"reference": "rpm-libs"},
          {"reference": "rpm-plugin-audit"},
          {"reference": "rpm-plugin-fapolicyd"},
          {"reference": "rpm-plugin-ima"},
          {"reference": "rpm-plugin-selinux"},
          {"reference": "rpm-plugin-syslog"},
          {"reference": "rpm-plugin-systemd-inhibit"},
          {"reference": "rpm-sign"},
          {"reference": "rpm-sign-libs"}
        ]
      }
    ]
  }
};

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');
}