Linux Distros Unpatched Vulnerability : CVE-2026-62437

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

include('compat.inc');

if (description)
{
  script_id(343922);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/08");

  script_cve_id("CVE-2026-62437");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-62437");

  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 guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices
    which were assigned to guests, and the associated removal of tracking structures for IRQs used by the
    devices occurs relatively early in the process. Unfortunately after that point the guest about to be
    terminated could cause its device model (DM) to re-establish such tracking structures, by having it bind
    one or more IRQs anew. While some of those tracking structures would still be cleaned up later on, at
    least one would not be. (CVE-2026-62437)

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-2026-62437");
  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: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:N/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-2026-62437");

  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:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/08");

  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:xen");
  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": "libxen-dev"},
          {"reference": "libxencall1"},
          {"reference": "libxendevicemodel1"},
          {"reference": "libxenevtchn1"},
          {"reference": "libxenforeignmemory1"},
          {"reference": "libxengnttab1"},
          {"reference": "libxenhypfs1"},
          {"reference": "libxenmisc4.17"},
          {"reference": "libxenstore4"},
          {"reference": "libxentoolcore1"},
          {"reference": "libxentoollog1"},
          {"reference": "xen-doc"},
          {"reference": "xen-hypervisor-4.17-amd64"},
          {"reference": "xen-hypervisor-4.17-amd64-dbg"},
          {"reference": "xen-hypervisor-4.17-arm64"},
          {"reference": "xen-hypervisor-4.17-arm64-dbg"},
          {"reference": "xen-hypervisor-4.17-armhf"},
          {"reference": "xen-hypervisor-4.17-armhf-dbg"},
          {"reference": "xen-hypervisor-common"},
          {"reference": "xen-system-amd64"},
          {"reference": "xen-system-arm64"},
          {"reference": "xen-system-armhf"},
          {"reference": "xen-utils-4.17"},
          {"reference": "xen-utils-4.17-dbg"},
          {"reference": "xen-utils-common"},
          {"reference": "xenstore-utils"}
        ]
      }
    ]
  },
  "Debian Linux-13": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "13",
        "pkgs": [
          {"reference": "libxen-dev"},
          {"reference": "libxencall1"},
          {"reference": "libxendevicemodel1"},
          {"reference": "libxenevtchn1"},
          {"reference": "libxenforeignmemory1"},
          {"reference": "libxengnttab1"},
          {"reference": "libxenhypfs1"},
          {"reference": "libxenmisc4.20"},
          {"reference": "libxenstore4"},
          {"reference": "libxentoolcore1"},
          {"reference": "libxentoollog1"},
          {"reference": "xen-doc"},
          {"reference": "xen-hypervisor-4.20-amd64"},
          {"reference": "xen-hypervisor-4.20-amd64-dbg"},
          {"reference": "xen-hypervisor-4.20-arm64"},
          {"reference": "xen-hypervisor-4.20-arm64-dbg"},
          {"reference": "xen-hypervisor-common"},
          {"reference": "xen-system-amd64"},
          {"reference": "xen-system-arm64"},
          {"reference": "xen-utils-4.20"},
          {"reference": "xen-utils-4.20-dbg"},
          {"reference": "xen-utils-common"},
          {"reference": "xenstore-utils"}
        ]
      }
    ]
  },
  "Debian Linux-14": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14",
        "pkgs": [
          {"reference": "libxen-dev"},
          {"reference": "libxencall1"},
          {"reference": "libxendevicemodel1"},
          {"reference": "libxenevtchn1"},
          {"reference": "libxenforeignmemory1"},
          {"reference": "libxengnttab1"},
          {"reference": "libxenhypfs1"},
          {"reference": "libxenmisc4.20"},
          {"reference": "libxenstore4"},
          {"reference": "libxentoolcore1"},
          {"reference": "libxentoollog1"},
          {"reference": "xen-doc"},
          {"reference": "xen-hypervisor-4.20-amd64"},
          {"reference": "xen-hypervisor-4.20-amd64-dbg"},
          {"reference": "xen-hypervisor-4.20-arm64"},
          {"reference": "xen-hypervisor-4.20-arm64-dbg"},
          {"reference": "xen-hypervisor-common"},
          {"reference": "xen-system-amd64"},
          {"reference": "xen-system-arm64"},
          {"reference": "xen-utils-4.20"},
          {"reference": "xen-utils-4.20-dbg"},
          {"reference": "xen-utils-common"},
          {"reference": "xenstore-utils"}
        ]
      }
    ]
  }
};

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');
}