Linux Distros Unpatched Vulnerability : CVE-2026-87910

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

include('compat.inc');

if (description)
{
  script_id(345123);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/12");

  script_cve_id("CVE-2026-87910");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-87910");

  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.

  - When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member
    from the archive. In this case, the filter function is run twice: once for the extracted member, and once
    with name set to the location of the link. For one of the calls, the return value was ignored. Instead,
    the member should be skipped if either call returns None. (CVE-2026-87910)

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-2026-87910");
  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:N/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:L/PR:N/UI:R/S:U/C:L/I:L/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-87910");

  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:"2026/09/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/12");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:"p-cpe:/a:debian:debian_linux:pypy3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.11");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.13");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.14");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3.15");
  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-12", "Host/OS/Debian Linux-13", "Host/OS/Debian Linux-14");

  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-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "idle-python3.11"},
          {"reference": "libpython3.11"},
          {"reference": "libpython3.11-dbg"},
          {"reference": "libpython3.11-dev"},
          {"reference": "libpython3.11-minimal"},
          {"reference": "libpython3.11-stdlib"},
          {"reference": "libpython3.11-testsuite"},
          {"reference": "pypy3"},
          {"reference": "pypy3-dev"},
          {"reference": "pypy3-doc"},
          {"reference": "pypy3-lib"},
          {"reference": "pypy3-lib-testsuite"},
          {"reference": "pypy3-tk"},
          {"reference": "pypy3-venv"},
          {"reference": "python3.11"},
          {"reference": "python3.11-dbg"},
          {"reference": "python3.11-dev"},
          {"reference": "python3.11-doc"},
          {"reference": "python3.11-examples"},
          {"reference": "python3.11-full"},
          {"reference": "python3.11-minimal"},
          {"reference": "python3.11-nopie"},
          {"reference": "python3.11-venv"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "idle-python3.13"},
          {"reference": "idle-python3.14"},
          {"reference": "idle-python3.15"},
          {"reference": "libpython3.13"},
          {"reference": "libpython3.13-dbg"},
          {"reference": "libpython3.13-dev"},
          {"reference": "libpython3.13-minimal"},
          {"reference": "libpython3.13-stdlib"},
          {"reference": "libpython3.13-testsuite"},
          {"reference": "libpython3.14"},
          {"reference": "libpython3.14-dbg"},
          {"reference": "libpython3.14-dev"},
          {"reference": "libpython3.14-minimal"},
          {"reference": "libpython3.14-stdlib"},
          {"reference": "libpython3.14-testsuite"},
          {"reference": "libpython3.15"},
          {"reference": "libpython3.15-dbg"},
          {"reference": "libpython3.15-dev"},
          {"reference": "libpython3.15-minimal"},
          {"reference": "libpython3.15-stdlib"},
          {"reference": "libpython3.15-testsuite"},
          {"reference": "pypy3"},
          {"reference": "pypy3-dev"},
          {"reference": "pypy3-doc"},
          {"reference": "pypy3-lib"},
          {"reference": "pypy3-lib-testsuite"},
          {"reference": "pypy3-tk"},
          {"reference": "pypy3-venv"},
          {"reference": "python3.13"},
          {"reference": "python3.13-dbg"},
          {"reference": "python3.13-dev"},
          {"reference": "python3.13-doc"},
          {"reference": "python3.13-examples"},
          {"reference": "python3.13-full"},
          {"reference": "python3.13-gdbm"},
          {"reference": "python3.13-minimal"},
          {"reference": "python3.13-nopie"},
          {"reference": "python3.13-tk"},
          {"reference": "python3.13-venv"},
          {"reference": "python3.14"},
          {"reference": "python3.14-dbg"},
          {"reference": "python3.14-dev"},
          {"reference": "python3.14-doc"},
          {"reference": "python3.14-examples"},
          {"reference": "python3.14-full"},
          {"reference": "python3.14-gdbm"},
          {"reference": "python3.14-minimal"},
          {"reference": "python3.14-nopie"},
          {"reference": "python3.14-tk"},
          {"reference": "python3.14-venv"},
          {"reference": "python3.15"},
          {"reference": "python3.15-dbg"},
          {"reference": "python3.15-dev"},
          {"reference": "python3.15-doc"},
          {"reference": "python3.15-examples"},
          {"reference": "python3.15-full"},
          {"reference": "python3.15-gdbm"},
          {"reference": "python3.15-minimal"},
          {"reference": "python3.15-nopie"},
          {"reference": "python3.15-tk"},
          {"reference": "python3.15-venv"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "idle-python3.13"},
          {"reference": "libpython3.13"},
          {"reference": "libpython3.13-dbg"},
          {"reference": "libpython3.13-dev"},
          {"reference": "libpython3.13-minimal"},
          {"reference": "libpython3.13-stdlib"},
          {"reference": "libpython3.13-testsuite"},
          {"reference": "pypy3"},
          {"reference": "pypy3-dev"},
          {"reference": "pypy3-doc"},
          {"reference": "pypy3-lib"},
          {"reference": "pypy3-lib-testsuite"},
          {"reference": "pypy3-tk"},
          {"reference": "pypy3-venv"},
          {"reference": "python3.13"},
          {"reference": "python3.13-dbg"},
          {"reference": "python3.13-dev"},
          {"reference": "python3.13-doc"},
          {"reference": "python3.13-examples"},
          {"reference": "python3.13-full"},
          {"reference": "python3.13-gdbm"},
          {"reference": "python3.13-minimal"},
          {"reference": "python3.13-nopie"},
          {"reference": "python3.13-tk"},
          {"reference": "python3.13-venv"}
        ]
      }
    ]
  }
};

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');
}