Linux Distros Unpatched Vulnerability : CVE-2022-49872

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

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  script_id(245040);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2022-49872");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-49872");

  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: gso: fix panic on frag_list with
    mixed head alloc types Since commit 3dcbdb134f32 (net: gso: Fix skb_segment splat when splitting gso_size
    mangled skb having linear-headed frag_list), it is allowed to change gso_size of a GRO packet. However,
    that commit assumes that checking the first list_skb member suffices; i.e if either of the list_skb
    members have non head_frag head, then the first one has too. It turns out this assumption does not hold.
    We've seen BUG_ON being hit in skb_segment when skbs on the frag_list had differing head_frag with the
    vmxnet3 driver. This happens because __netdev_alloc_skb and __napi_alloc_skb can return a skb that is page
    backed or kmalloced depending on the requested size. As the result, the last small skb in the GRO packet
    can be kmalloced. There are three different locations where this can be fixed: (1) We could check
    head_frag in GRO and not allow GROing skbs with different head_frag. However, that would lead to
    performance regression on normal forward paths with unmodified gso_size, where !head_frag in the last
    packet is not a problem. (2) Set a flag in bpf_skb_net_grow and bpf_skb_net_shrink indicating that
    NETIF_F_SG is undesirable. That would need to eat a bit in sk_buff. Furthermore, that flag can be unset
    when all skbs on the frag_list are page backed. To retain good performance, bpf_skb_net_grow/shrink would
    have to walk the frag_list. (3) Walk the frag_list in skb_segment when determining whether NETIF_F_SG
    should be cleared. This of course slows things down. This patch implements (3). To limit the performance
    impact in skb_segment, the list is walked only for skbs with SKB_GSO_DODGY set that have gso_size changed.
    Normal paths thus will not hit it. We could check only the last skb but since we need to walk the whole
    list anyway, let's stay on the safe side. (CVE-2022-49872)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2022-49872");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2022-49872");
  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:N/I:N/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-2022-49872");

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  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/05/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/07");

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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")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "9",
        "pkgs": [
          {"reference": "kernel-rt"},
          {"reference": "kernel-rt-core"},
          {"reference": "kernel-rt-debug"},
          {"reference": "kernel-rt-debug-core"},
          {"reference": "kernel-rt-debug-devel"},
          {"reference": "kernel-rt-debug-devel-matched"},
          {"reference": "kernel-rt-debug-kvm"},
          {"reference": "kernel-rt-debug-modules"},
          {"reference": "kernel-rt-debug-modules-core"},
          {"reference": "kernel-rt-debug-modules-extra"},
          {"reference": "kernel-rt-debug-modules-internal"},
          {"reference": "kernel-rt-debug-modules-partner"},
          {"reference": "kernel-rt-devel"},
          {"reference": "kernel-rt-devel-matched"},
          {"reference": "kernel-rt-kvm"},
          {"reference": "kernel-rt-modules"},
          {"reference": "kernel-rt-modules-core"},
          {"reference": "kernel-rt-modules-extra"},
          {"reference": "kernel-rt-modules-internal"},
          {"reference": "kernel-rt-modules-partner"},
          {"reference": "kernel-rt-selftests-internal"}
        ]
      }
    ]
  }
};

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');
}