Linux Distros Unpatched Vulnerability : CVE-2022-50257

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

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if (description)
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  script_id(265143);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2022-50257");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-50257");

  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.

  - In the Linux kernel, the following vulnerability has been resolved: xen/gntdev: Prevent leaking grants
    Prior to this commit, if a grant mapping operation failed partially, some of the entries in the map_ops
    array would be invalid, whereas all of the entries in the kmap_ops array would be valid. This in turn
    would cause the following logic in gntdev_map_grant_pages to become invalid: for (i = 0; i < map->count;
    i++) { if (map->map_ops[i].status == GNTST_okay) { map->unmap_ops[i].handle = map->map_ops[i].handle; if
    (!use_ptemod) alloced++; } if (use_ptemod) { if (map->kmap_ops[i].status == GNTST_okay) { if
    (map->map_ops[i].status == GNTST_okay) alloced++; map->kunmap_ops[i].handle = map->kmap_ops[i].handle; } }
    } ... atomic_add(alloced, &map->live_grants); Assume that use_ptemod is true (i.e., the domain mapping the
    granted pages is a paravirtualized domain). In the code excerpt above, note that the alloced variable is
    only incremented when both kmap_ops[i].status and map_ops[i].status are set to GNTST_okay (i.e., both
    mapping operations are successful). However, as also noted above, there are cases where a grant mapping
    operation fails partially, breaking the assumption of the code excerpt above. The aforementioned causes
    map->live_grants to be incorrectly set. In some cases, all of the map_ops mappings fail, but all of the
    kmap_ops mappings succeed, meaning that live_grants may remain zero. This in turn makes it impossible to
    unmap the successfully grant-mapped pages pointed to by kmap_ops, because unmap_grant_pages has the
    following snippet of code at its beginning: if (atomic_read(&map->live_grants) == 0) return; /* Nothing to
    do */ In other cases where only some of the map_ops mappings fail but all kmap_ops mappings succeed,
    live_grants is made positive, but when the user requests unmapping the grant-mapped pages,
    __unmap_grant_pages_done will then make map->live_grants negative, because the latter function does not
    check if all of the pages that were requested to be unmapped were actually unmapped, and the same function
    unconditionally subtracts data->count (i.e., a value that can be greater than map->live_grants) from
    map->live_grants. The side effects of a negative live_grants value have not been studied. The net effect
    of all of this is that grant references are leaked in one of the above conditions. In Qubes OS v4.1 (which
    uses Xen's grant mechanism extensively for X11 GUI isolation), this issue manifests itself with warning
    messages like the following to be printed out by the Linux kernel in the VM that had granted pages (that
    contain X11 GUI window data) to dom0: g.e. 0x1234 still pending, especially after the user rapidly
    resizes GUI VM windows (causing some grant-mapping operations to partially or completely fail, due to the
    fact that the VM unshares some of the pages as part of the window resizing, making the pages impossible to
    grant-map from dom0). The fix for this issue involves counting all successful map_ops and kmap_ops
    mappings separately, and then adding the sum to live_grants. During unmapping, only the number of
    successfully unmapped grants is subtracted from live_grants. The code is also modified to check for
    negative live_grants values after the subtraction and warn the user. (CVE-2022-50257)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2022-50257");
  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:L/Au:N/C:P/I:C/A:C");
  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:N/S:U/C:N/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-2022-50257");

  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:"2025/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/17");

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  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) 2025-2026 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/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");

  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 = {
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "linux-aws-5.0"},
          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
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          {"reference": "linux-cloud-tools-4.15.0"},
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          {"reference": "linux-gcp-headers-4.15.0"},
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          {"reference": "linux-gke-5.4"},
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          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.8-headers-6.8.0"},
          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  }
};

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');
}