Linux Distros Unpatched Vulnerability : CVE-2026-19079

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

include('compat.inc');

if (description)
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  script_id(333304);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/07");

  script_cve_id("CVE-2026-19079");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-19079");

  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 TOCTOU (Time-of-Check-Time-of-Use) race condition vulnerability was found in the fixfiles script in
    policycoreutils. When running fixfiles relabel or fixfiles restore, the script used find and chcon
    commands to locate and relabel unlabeled files under /tmp and other directories. A local attacker could
    exploit a race window between the file discovery and the label change operation by swapping directory
    components with symlinks, causing chcon to follow the symlink and modify SELinux labels on arbitrary
    system files. This could undermine SELinux mandatory access control protections on critical files such as
    /etc/shadow. (CVE-2026-19079)

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-2026-19079");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-19079");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-19079");
  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:L/AC:M/Au:N/C:C/I:C/A:C");
  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:L/UI:R/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-19079");

  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:"2026/08/07");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/07");

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  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  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:debian:debian_linux:11.0");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:policycoreutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:policycoreutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:policycoreutils-dbus");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:policycoreutils-sandbox");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:python3-policycoreutils");
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  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
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  exit(0);
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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/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-11": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "11",
        "pkgs": [
          {"reference": "newrole"},
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "newrole"},
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "newrole"},
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "newrole"},
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "policycoreutils"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "policycoreutils"},
          {"reference": "policycoreutils-dbus"},
          {"reference": "policycoreutils-devel"},
          {"reference": "policycoreutils-gui"},
          {"reference": "policycoreutils-newrole"},
          {"reference": "policycoreutils-python-utils"},
          {"reference": "policycoreutils-restorecond"},
          {"reference": "policycoreutils-sandbox"},
          {"reference": "python3-policycoreutils"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "policycoreutils"},
          {"reference": "policycoreutils-dbus"},
          {"reference": "policycoreutils-devel"},
          {"reference": "policycoreutils-gui"},
          {"reference": "policycoreutils-newrole"},
          {"reference": "policycoreutils-python-utils"},
          {"reference": "policycoreutils-restorecond"},
          {"reference": "policycoreutils-sandbox"},
          {"reference": "python3-policycoreutils"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "policycoreutils"},
          {"reference": "policycoreutils-dbus"},
          {"reference": "policycoreutils-devel"},
          {"reference": "policycoreutils-gui"},
          {"reference": "policycoreutils-newrole"},
          {"reference": "policycoreutils-python-utils"},
          {"reference": "policycoreutils-restorecond"},
          {"reference": "policycoreutils-sandbox"},
          {"reference": "python3-policycoreutils"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "policycoreutils"},
          {"reference": "policycoreutils-dbus"},
          {"reference": "policycoreutils-devel"},
          {"reference": "policycoreutils-gui"},
          {"reference": "policycoreutils-newrole"},
          {"reference": "policycoreutils-python-utils"},
          {"reference": "policycoreutils-restorecond"},
          {"reference": "policycoreutils-sandbox"},
          {"reference": "python3-policycoreutils"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "policycoreutils"},
          {"reference": "policycoreutils-devel"},
          {"reference": "policycoreutils-gui"},
          {"reference": "policycoreutils-newrole"},
          {"reference": "policycoreutils-python"},
          {"reference": "policycoreutils-restorecond"},
          {"reference": "policycoreutils-sandbox"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "policycoreutils"},
          {"reference": "policycoreutils-devel"},
          {"reference": "policycoreutils-gui"},
          {"reference": "policycoreutils-newrole"},
          {"reference": "policycoreutils-python"},
          {"reference": "policycoreutils-restorecond"},
          {"reference": "policycoreutils-sandbox"}
        ]
      }
    ]
  }
};

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');
}