Linux Distros Unpatched Vulnerability : CVE-2026-12892

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

include('compat.inc');

if (description)
{
  script_id(323656);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/30");

  script_cve_id("CVE-2026-12892");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-12892");

  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 GStreamer's gst-plugins-bad package. When processing a specially crafted H.264 video
    file containing malformed MVC or SVC extension slice NAL units, a 1-byte heap out-of-bounds read can occur
    during parsing. This happens when the parser attempts to check slice boundary information without first
    verifying that the NAL unit contains enough data beyond the extension header. An attacker could exploit
    this by tricking a user into opening a malicious H.264 video file, potentially causing the application to
    crash or leak a single byte of heap memory. (CVE-2026-12892)

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-2026-12892");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-12892");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-12892");
  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:N/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:R/S:U/C:L/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-12892");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-12892");

  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:"2026/06/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  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:25.10");
  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");
  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:canonical:ubuntu_linux:gst-plugins-bad1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer-plugins-bad-free");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer-plugins-bad-free-devel");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-gtk");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:gstreamer1-plugins-bad-free-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gst-plugins-bad1.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-bad-free");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer-plugins-bad-free-devel");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:gstreamer1-plugins-bad-free-gtk");
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  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-11", "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", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10", "Host/OS/Ubuntu Linux-26.04");

  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/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": "gir1.2-gst-plugins-bad-1.0"},
          {"reference": "gstreamer1.0-opencv"},
          {"reference": "gstreamer1.0-plugins-bad"},
          {"reference": "gstreamer1.0-plugins-bad-apps"},
          {"reference": "gstreamer1.0-wpe"},
          {"reference": "libgstreamer-opencv1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-dev"}
        ]
      }
    ]
  },
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "gir1.2-gst-plugins-bad-1.0"},
          {"reference": "gstreamer1.0-opencv"},
          {"reference": "gstreamer1.0-plugins-bad"},
          {"reference": "gstreamer1.0-plugins-bad-apps"},
          {"reference": "gstreamer1.0-wpe"},
          {"reference": "libgstreamer-opencv1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-dev"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "gir1.2-gst-plugins-bad-1.0"},
          {"reference": "gstreamer1.0-opencv"},
          {"reference": "gstreamer1.0-plugins-bad"},
          {"reference": "gstreamer1.0-plugins-bad-apps"},
          {"reference": "gstreamer1.0-wpe"},
          {"reference": "libgstreamer-opencv1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-dev"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "gir1.2-gst-plugins-bad-1.0"},
          {"reference": "gstreamer1.0-opencv"},
          {"reference": "gstreamer1.0-plugins-bad"},
          {"reference": "gstreamer1.0-plugins-bad-apps"},
          {"reference": "gstreamer1.0-wpe"},
          {"reference": "libgstreamer-opencv1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-dev"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "gst-plugins-bad1.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "gir1.2-gst-plugins-bad-1.0"},
          {"reference": "gir1.2-gst-plugins-extra-1.0"},
          {"reference": "gstreamer1.0-opencv"},
          {"reference": "gstreamer1.0-plugins-bad"},
          {"reference": "gstreamer1.0-plugins-bad-apps"},
          {"reference": "gstreamer1.0-plugins-extra"},
          {"reference": "libgstreamer-opencv1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-0"},
          {"reference": "libgstreamer-plugins-bad1.0-dev"},
          {"reference": "libgstreamer-plugins-extra1.0-0"},
          {"reference": "libgstreamer-plugins-extra1.0-dev"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-10": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "10",
        "pkgs": [
          {"reference": "gstreamer1-plugins-bad-free"},
          {"reference": "gstreamer1-plugins-bad-free-devel"},
          {"reference": "gstreamer1-plugins-bad-free-libs"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-9": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "gstreamer1-plugins-bad-free"},
          {"reference": "gstreamer1-plugins-bad-free-devel"},
          {"reference": "gstreamer1-plugins-bad-free-libs"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-6": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "6",
        "pkgs": [
          {"reference": "gstreamer-plugins-bad-free"},
          {"reference": "gstreamer-plugins-bad-free-devel"},
          {"reference": "gstreamer-plugins-bad-free-devel-docs"},
          {"reference": "gstreamer-plugins-bad-free-extras"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "gstreamer1-plugins-bad-free"},
          {"reference": "gstreamer1-plugins-bad-free-devel"},
          {"reference": "gstreamer1-plugins-bad-free-gtk"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "gstreamer1-plugins-bad-free"},
          {"reference": "gstreamer1-plugins-bad-free-devel"},
          {"reference": "gstreamer1-plugins-bad-free-gtk"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gstreamer1-plugins-bad-free"},
          {"reference": "gstreamer1-plugins-bad-free-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "gstreamer1-plugins-bad-free"},
          {"reference": "gstreamer1-plugins-bad-free-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 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');
}