Linux Distros Unpatched Vulnerability : CVE-2026-6785

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

include('compat.inc');

if (description)
{
  script_id(309065);
  script_version("1.16");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2026-6785");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-6785");

  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.

  - Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149
    and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with
    enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed
    in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6785)

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-2026-6785");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-6785");
  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:M/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:N/AC:H/PR:N/UI:N/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-2026-6785");

  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:"2026/04/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:redhat:enterprise_linux:10");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs102");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs115");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs38");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs52");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs68");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs78");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:mozjs91");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:thunderbird");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:firefox-flatpak");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:thunderbird-flatpak");
  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/Red Hat Enterprise Linux-10", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04");

  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/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 = {
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "libmozjs-52-0"},
          {"reference": "libmozjs-52-dev"},
          {"reference": "mozjs38"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "libmozjs-68-0"},
          {"reference": "libmozjs-68-dev"},
          {"reference": "mozjs52"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "libmozjs-91-0"},
          {"reference": "libmozjs-91-dev"},
          {"reference": "mozjs102"},
          {"reference": "mozjs78"},
          {"reference": "thunderbird"},
          {"reference": "thunderbird-dbg"},
          {"reference": "thunderbird-dev"},
          {"reference": "thunderbird-gnome-support"},
          {"reference": "thunderbird-gnome-support-dbg"},
          {"reference": "thunderbird-locale-af"},
          {"reference": "thunderbird-locale-ar"},
          {"reference": "thunderbird-locale-ast"},
          {"reference": "thunderbird-locale-be"},
          {"reference": "thunderbird-locale-bg"},
          {"reference": "thunderbird-locale-bn"},
          {"reference": "thunderbird-locale-bn-bd"},
          {"reference": "thunderbird-locale-br"},
          {"reference": "thunderbird-locale-ca"},
          {"reference": "thunderbird-locale-cak"},
          {"reference": "thunderbird-locale-cs"},
          {"reference": "thunderbird-locale-cy"},
          {"reference": "thunderbird-locale-da"},
          {"reference": "thunderbird-locale-de"},
          {"reference": "thunderbird-locale-dsb"},
          {"reference": "thunderbird-locale-el"},
          {"reference": "thunderbird-locale-en-gb"},
          {"reference": "thunderbird-locale-en-us"},
          {"reference": "thunderbird-locale-es-ar"},
          {"reference": "thunderbird-locale-es-es"},
          {"reference": "thunderbird-locale-fy-nl"},
          {"reference": "thunderbird-locale-ga-ie"},
          {"reference": "thunderbird-locale-nb-no"},
          {"reference": "thunderbird-locale-nn-no"},
          {"reference": "thunderbird-locale-pa-in"},
          {"reference": "thunderbird-locale-pt-br"},
          {"reference": "thunderbird-locale-pt-pt"},
          {"reference": "thunderbird-locale-sv-se"},
          {"reference": "thunderbird-locale-ta-lk"},
          {"reference": "thunderbird-locale-zh-cn"},
          {"reference": "thunderbird-locale-zh-tw"},
          {"reference": "thunderbird-mozsymbols"},
          {"reference": "xul-ext-calendar-timezones"},
          {"reference": "xul-ext-gdata-provider"},
          {"reference": "xul-ext-lightning"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "libmozjs-115-0t64"},
          {"reference": "libmozjs-115-dev"},
          {"reference": "mozjs102"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "firefox-flatpak"},
          {"reference": "thunderbird-flatpak"}
        ]
      }
    ]
  }
};

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 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');
}