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Linux Distros Unpatched Vulnerability : CVE-2022-50483

🗓️ 08 Oct 2025 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 1 Views

Linux systems with unpatched CVE-2022-50483 in enetc may leak buffers during XDP redirect.

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Rows per page
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(269325);
  script_version("1.5");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2022-50483");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-50483");

  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: net: enetc: avoid buffer leaks on
    xdp_do_redirect() failure Before enetc_clean_rx_ring_xdp() calls xdp_do_redirect(), each software BD in
    the RX ring between index orig_i and i can have one of 2 refcount values on its page. We are the owner of
    the current buffer that is being processed, so the refcount will be at least 1. If the current owner of
    the buffer at the diametrically opposed index in the RX ring (i.o.w, the other half of this page) has not
    yet called kfree(), this page's refcount could even be 2. enetc_page_reusable() in enetc_flip_rx_buff()
    tests for the page refcount against 1, and [ if it's 2 ] does not attempt to reuse it. But if
    enetc_flip_rx_buff() is put after the xdp_do_redirect() call, the page refcount can have one of 3 values.
    It can also be 0, if there is no owner of the other page half, and xdp_do_redirect() for this buffer ran
    so far that it triggered a flush of the devmap/cpumap bulk queue, and the consumers of those bulk queues
    also freed the buffer, all by the time xdp_do_redirect() returns the execution back to enetc. This is the
    reason why enetc_flip_rx_buff() is called before xdp_do_redirect(), but there is a big flaw with that
    reasoning: enetc_flip_rx_buff() will set rx_swbd->page = NULL on both sides of the enetc_page_reusable()
    branch, and if xdp_do_redirect() returns an error, we call enetc_xdp_free(), which does not deal
    gracefully with that. In fact, what happens is quite special. The page refcounts start as 1.
    enetc_flip_rx_buff() figures they're reusable, transfers these rx_swbd->page pointers to a different
    rx_swbd in enetc_reuse_page(), and bumps the refcount to 2. When xdp_do_redirect() later returns an error,
    we call the no-op enetc_xdp_free(), but we still haven't lost the reference to that page. A copy of it is
    still at rx_ring->next_to_alloc, but that has refcount 2 (and there are no concurrent owners of it in
    flight, to drop the refcount). What really kills the system is when we'll flip the rx_swbd->page the
    second time around. With an updated refcount of 2, the page will not be reusable and we'll really leak it.
    Then enetc_new_page() will have to allocate more pages, which will then eventually leak again on further
    errors from xdp_do_redirect(). The problem, summarized, is that we zeroize rx_swbd->page before we're
    completely done with it, and this makes it impossible for the error path to do something with it. Since
    the packet is potentially multi-buffer and therefore the rx_swbd->page is potentially an array, manual
    passing of the old pointers between enetc_flip_rx_buff() and enetc_xdp_free() is a bit difficult. For the
    sake of going with a simple solution, we accept the possibility of racing with xdp_do_redirect(), and we
    move the flip procedure to execute only on the redirect success path. By racing, I mean that the page may
    be deemed as not reusable by enetc (having a refcount of 0), but there will be no leak in that case,
    either. Once we accept that, we have something better to do with buffers on XDP_REDIRECT failure. Since we
    haven't performed half-page flipping yet, we won't, either (and this way, we can avoid enetc_xdp_free()
    completely, which gives the entire page to the slab allocator). Instead, we'll call enetc_xdp_drop(),
    which will recycle this half of the buffer back to the RX ring. (CVE-2022-50483)

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-2022-50483");
  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:N/A:N");
  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-2022-50483");

  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:"2025/10/04");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/08");

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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"},
          {"reference": "linux-azure-edge"},
          {"reference": "linux-azure-headers-4.15.0"},
          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
          {"reference": "linux-gcp-5.3"},
          {"reference": "linux-gcp-headers-4.15.0"},
          {"reference": "linux-gcp-tools-4.15.0"},
          {"reference": "linux-gke-4.15"},
          {"reference": "linux-gke-5.4"},
          {"reference": "linux-gkeop-5.4"},
          {"reference": "linux-headers-4.15.0"},
          {"reference": "linux-hwe"},
          {"reference": "linux-hwe-edge"},
          {"reference": "linux-image-4.15.0"},
          {"reference": "linux-image-unsigned-4.15.0"},
          {"reference": "linux-modules-4.15.0"},
          {"reference": "linux-modules-extra-4.15.0"},
          {"reference": "linux-oem-headers-4.15.0"},
          {"reference": "linux-oem-tools-4.15.0"},
          {"reference": "linux-oracle-5.0"},
          {"reference": "linux-oracle-5.3"},
          {"reference": "linux-tools-4.15.0"},
          {"reference": "linux-udebs-azure"},
          {"reference": "linux-udebs-oem"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
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          {"reference": "linux-aws-5.13"},
          {"reference": "linux-aws-5.8"},
          {"reference": "linux-azure-5.11"},
          {"reference": "linux-azure-5.13"},
          {"reference": "linux-azure-5.8"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-buildinfo-5.4.0"},
          {"reference": "linux-buildinfo-5.6.0"},
          {"reference": "linux-cloud-tools-5.4.0"},
          {"reference": "linux-cloud-tools-5.6.0"},
          {"reference": "linux-gcp-5.11"},
          {"reference": "linux-gcp-5.13"},
          {"reference": "linux-gcp-5.8"},
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          {"reference": "linux-gkeop-5.15"},
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          {"reference": "linux-hwe-5.8"},
          {"reference": "linux-image-5.4.0"},
          {"reference": "linux-image-unsigned-5.6.0"},
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          {"reference": "linux-modules-5.6.0"},
          {"reference": "linux-modules-extra-5.4.0"},
          {"reference": "linux-modules-extra-5.6.0"},
          {"reference": "linux-oem-5.10"},
          {"reference": "linux-oem-5.13"},
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          {"reference": "linux-oem-5.6-headers-5.6.0"},
          {"reference": "linux-oem-5.6-tools-5.6.0"},
          {"reference": "linux-oem-5.6-tools-common"},
          {"reference": "linux-oem-5.6-tools-host"},
          {"reference": "linux-oracle-5.11"},
          {"reference": "linux-oracle-5.13"},
          {"reference": "linux-oracle-5.8"},
          {"reference": "linux-raspi2"},
          {"reference": "linux-riscv-5.11"},
          {"reference": "linux-riscv-5.8"},
          {"reference": "linux-riscv-headers-5.4.0"},
          {"reference": "linux-riscv-tools-5.4.0"},
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          {"reference": "linux-tools-5.6.0"},
          {"reference": "linux-udebs-generic"},
          {"reference": "linux-udebs-oem"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
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          {"reference": "linux-azure-5.19"},
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          {"reference": "linux-hwe-6.2"},
          {"reference": "linux-hwe-6.5"},
          {"reference": "linux-image-5.15.0"},
          {"reference": "linux-image-unsigned-5.17.0"},
          {"reference": "linux-intel-iot-realtime"},
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          {"reference": "linux-nvidia-6.2"},
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          {"reference": "linux-riscv-5.19"},
          {"reference": "linux-riscv-6.5"},
          {"reference": "linux-riscv-headers-5.15.0"},
          {"reference": "linux-riscv-tools-5.15.0"},
          {"reference": "linux-starfive-5.19"},
          {"reference": "linux-starfive-6.2"},
          {"reference": "linux-starfive-6.5"},
          {"reference": "linux-tools-5.15.0"},
          {"reference": "linux-tools-5.17.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-intel"},
          {"reference": "linux-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-extra-6.8.0"},
          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"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');
}

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21 May 2026 00:00Current
6Medium risk
Vulners AI Score6
CVSS 3.15.5
EPSS0.00018
1