Linux Distros Unpatched Vulnerability : CVE-2026-86476

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

include('compat.inc');

if (description)
{
  script_id(365685);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/15");

  script_cve_id("CVE-2026-86476");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-86476");

  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 gst-plugins-base. A heap buffer overflow can be triggered when processing video
    buffers whose attached GstVideoMeta metadata declares plane strides and offsets that exceed the actual
    backing memory allocation. The metadata is not range-checked during deserialization, and the video frame
    mapping code does not verify that the declared plane geometry fits within the buffer before allowing
    consumers to read or write video data. A local attacker who controls the sending side of a GStreamer
    inter-process IPC pipeline can deliver a crafted buffer carrying fabricated strides, causing the receiving
    process to read or write beyond heap boundaries. Successful exploitation can cause a denial of service or
    potentially allow code execution within the affected process. (CVE-2026-86476)

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-2026-86476");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-86476");
  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: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:L/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-2026-86476");

  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:"2026/10/12");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/14");

  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:6");
  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:gstreamer-plugins-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer-plugins-base-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer-plugins-base-devel-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer-plugins-base-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-base-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-base-devel-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-base-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gst-plugins-base1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-base-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-base-devel-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-base-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-base");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-base-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-base-devel-docs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-base-tools");
  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-6", "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": "gir1.2-gst-plugins-base-1.0"},
          {"reference": "gstreamer1.0-alsa"},
          {"reference": "gstreamer1.0-gl"},
          {"reference": "gstreamer1.0-plugins-base"},
          {"reference": "gstreamer1.0-plugins-base-apps"},
          {"reference": "gstreamer1.0-x"},
          {"reference": "libgstreamer-gl1.0-0"},
          {"reference": "libgstreamer-plugins-base1.0-0"},
          {"reference": "libgstreamer-plugins-base1.0-dev"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "gir1.2-gst-plugins-base-1.0"},
          {"reference": "gstreamer1.0-alsa"},
          {"reference": "gstreamer1.0-gl"},
          {"reference": "gstreamer1.0-plugins-base"},
          {"reference": "gstreamer1.0-plugins-base-apps"},
          {"reference": "gstreamer1.0-x"},
          {"reference": "libgstreamer-gl1.0-0"},
          {"reference": "libgstreamer-plugins-base1.0-0"},
          {"reference": "libgstreamer-plugins-base1.0-dev"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "gir1.2-gst-plugins-base-1.0"},
          {"reference": "gstreamer1.0-alsa"},
          {"reference": "gstreamer1.0-gl"},
          {"reference": "gstreamer1.0-plugins-base"},
          {"reference": "gstreamer1.0-plugins-base-apps"},
          {"reference": "gstreamer1.0-x"},
          {"reference": "libgstreamer-gl1.0-0"},
          {"reference": "libgstreamer-plugins-base1.0-0"},
          {"reference": "libgstreamer-plugins-base1.0-dev"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "gstreamer1-plugins-base"},
          {"reference": "gstreamer1-plugins-base-devel"},
          {"reference": "gstreamer1-plugins-base-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "gstreamer1-plugins-base"},
          {"reference": "gstreamer1-plugins-base-devel"},
          {"reference": "gstreamer1-plugins-base-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "gstreamer-plugins-base"},
          {"reference": "gstreamer-plugins-base-devel"},
          {"reference": "gstreamer-plugins-base-devel-docs"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "gstreamer-plugins-base"},
          {"reference": "gstreamer-plugins-base-devel"},
          {"reference": "gstreamer-plugins-base-devel-docs"},
          {"reference": "gstreamer-plugins-base-tools"},
          {"reference": "gstreamer1-plugins-base"},
          {"reference": "gstreamer1-plugins-base-devel"},
          {"reference": "gstreamer1-plugins-base-devel-docs"},
          {"reference": "gstreamer1-plugins-base-tools"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "gstreamer-plugins-base"},
          {"reference": "gstreamer-plugins-base-devel"},
          {"reference": "gstreamer-plugins-base-devel-docs"},
          {"reference": "gstreamer-plugins-base-tools"},
          {"reference": "gstreamer1-plugins-base"},
          {"reference": "gstreamer1-plugins-base-devel"},
          {"reference": "gstreamer1-plugins-base-devel-docs"},
          {"reference": "gstreamer1-plugins-base-tools"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gstreamer1-plugins-base"},
          {"reference": "gstreamer1-plugins-base-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gstreamer1-plugins-base"},
          {"reference": "gstreamer1-plugins-base-devel"}
        ]
      }
    ]
  }
};

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');
}