Linux Distros Unpatched Vulnerability : CVE-2026-3950

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

include('compat.inc');

if (description)
{
  script_id(302001);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2026-3950");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-3950");

  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 vulnerability was identified in strukturag libheif up to 1.21.2. This impacts the function Track::load
    of the file libheif/sequences/track.cc of the component stsz/stts. The manipulation leads to out-of-bounds
    read. The attack needs to be performed locally. The exploit is publicly available and might be used.
    Applying a patch is the recommended action to fix this issue. The patch available is inofficial and not
    approved yet. (CVE-2026-3950)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-3950");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-3950");
  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: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:L/UI:R/S:U/C:H/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-2026-3950");

  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:"2026/03/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:14.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libheif");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libheif");
  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/Debian Linux-14", "Host/OS/Ubuntu Linux-25.10");

  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"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "heif-gdk-pixbuf"},
          {"reference": "heif-thumbnailer"},
          {"reference": "heif-view"},
          {"reference": "libheif-dev"},
          {"reference": "libheif-examples"},
          {"reference": "libheif-plugin-aomdec"},
          {"reference": "libheif-plugin-aomenc"},
          {"reference": "libheif-plugin-dav1d"},
          {"reference": "libheif-plugin-ffmpegdec"},
          {"reference": "libheif-plugin-j2kdec"},
          {"reference": "libheif-plugin-j2kenc"},
          {"reference": "libheif-plugin-jpegdec"},
          {"reference": "libheif-plugin-jpegenc"},
          {"reference": "libheif-plugin-kvazaar"},
          {"reference": "libheif-plugin-libde265"},
          {"reference": "libheif-plugin-rav1e"},
          {"reference": "libheif-plugin-svtenc"},
          {"reference": "libheif-plugin-x265"},
          {"reference": "libheif-plugins-all"},
          {"reference": "libheif1"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "heif-gdk-pixbuf"},
          {"reference": "heif-thumbnailer"},
          {"reference": "heif-view"},
          {"reference": "libheif-dev"},
          {"reference": "libheif-examples"},
          {"reference": "libheif-plugin-aomdec"},
          {"reference": "libheif-plugin-aomenc"},
          {"reference": "libheif-plugin-dav1d"},
          {"reference": "libheif-plugin-ffmpegdec"},
          {"reference": "libheif-plugin-j2kdec"},
          {"reference": "libheif-plugin-j2kenc"},
          {"reference": "libheif-plugin-jpegdec"},
          {"reference": "libheif-plugin-jpegenc"},
          {"reference": "libheif-plugin-kvazaar"},
          {"reference": "libheif-plugin-libde265"},
          {"reference": "libheif-plugin-rav1e"},
          {"reference": "libheif-plugin-svtenc"},
          {"reference": "libheif-plugin-x265"},
          {"reference": "libheif-plugins-all"},
          {"reference": "libheif1"}
        ]
      }
    ]
  }
};

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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}