Linux Distros Unpatched Vulnerability : CVE-2026-84270

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

include('compat.inc');

if (description)
{
  script_id(342192);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/02");

  script_cve_id("CVE-2026-84270");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-84270");

  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 the MTP backend in gvfs. When reading a file from a mounted MTP device, do_read() in
    gvfsbackendmtp.c trusts the data length returned by the device without limiting it to the original size
    requested by the client. If a malicious MTP device responds with more bytes than requested, this
    unrestricted length is passed directly to memcpy(). This causes the operation to read memory outside the
    intended boundaries. This allows an attacker who plugs in a malicious MTP device to cause a segmentation
    fault when a file is read and crash the gvfsd-mtp process, resulting in a denial of service.
    (CVE-2026-84270)

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-2026-84270");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-84270");
  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: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:P/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-2026-84270");

  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:"2026/09/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/01");

  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:debian:debian_linux:12.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:13.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  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:gvfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-afc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-afp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-archive");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-fuse");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-goa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-gphoto2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-mtp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-smb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gvfs-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gvfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-afc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-afp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-archive");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-client");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-fuse");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-goa");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-gphoto2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-mtp");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-smb");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gvfs-tests");
  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/Debian Linux-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14", "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/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-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-backends"},
          {"reference": "gvfs-common"},
          {"reference": "gvfs-daemons"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-libs"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-backends"},
          {"reference": "gvfs-common"},
          {"reference": "gvfs-daemons"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-libs"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-backends"},
          {"reference": "gvfs-common"},
          {"reference": "gvfs-daemons"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-libs"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-client"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-goa"},
          {"reference": "gvfs-gphoto2"},
          {"reference": "gvfs-mtp"},
          {"reference": "gvfs-smb"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-afc"},
          {"reference": "gvfs-afp"},
          {"reference": "gvfs-archive"},
          {"reference": "gvfs-client"},
          {"reference": "gvfs-devel"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-goa"},
          {"reference": "gvfs-gphoto2"},
          {"reference": "gvfs-mtp"},
          {"reference": "gvfs-smb"},
          {"reference": "gvfs-tests"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-afc"},
          {"reference": "gvfs-afp"},
          {"reference": "gvfs-archive"},
          {"reference": "gvfs-client"},
          {"reference": "gvfs-devel"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-goa"},
          {"reference": "gvfs-gphoto2"},
          {"reference": "gvfs-mtp"},
          {"reference": "gvfs-smb"},
          {"reference": "gvfs-tests"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-afc"},
          {"reference": "gvfs-afp"},
          {"reference": "gvfs-archive"},
          {"reference": "gvfs-client"},
          {"reference": "gvfs-devel"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-goa"},
          {"reference": "gvfs-gphoto2"},
          {"reference": "gvfs-mtp"},
          {"reference": "gvfs-smb"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-afc"},
          {"reference": "gvfs-afp"},
          {"reference": "gvfs-archive"},
          {"reference": "gvfs-client"},
          {"reference": "gvfs-devel"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-goa"},
          {"reference": "gvfs-gphoto2"},
          {"reference": "gvfs-mtp"},
          {"reference": "gvfs-smb"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "gvfs"},
          {"reference": "gvfs-client"},
          {"reference": "gvfs-devel"},
          {"reference": "gvfs-fuse"},
          {"reference": "gvfs-goa"},
          {"reference": "gvfs-gphoto2"},
          {"reference": "gvfs-mtp"},
          {"reference": "gvfs-smb"}
        ]
      }
    ]
  }
};

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');
}