Linux Distros Unpatched Vulnerability : CVE-2024-26921

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

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  script_id(228004);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2024-26921");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-26921");

  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: inet: inet_defrag: prevent sk release
    while still in use ip_local_out() and other functions can pass skb->sk as function argument. If the skb is
    a fragment and reassembly happens before such function call returns, the sk must not be released. This
    affects skb fragments reassembled via netfilter or similar modules, e.g. openvswitch or ct_act.c, when run
    as part of tx pipeline. Eric Dumazet made an initial analysis of this bug. Quoting Eric: Calling
    ip_defrag() in output path is also implying skb_orphan(), which is buggy because output path relies on sk
    not disappearing. A relevant old patch about the issue was : 8282f27449bf (inet: frag: Always orphan skbs
    inside ip_defrag()) [..] net/ipv4/ip_output.c depends on skb->sk being set, and probably to an inet
    socket, not an arbitrary one. If we orphan the packet in ipvlan, then downstream things like FQ packet
    scheduler will not work properly. We need to change ip_defrag() to only use skb_orphan() when really
    needed, ie whenever frag_list is going to be used. Eric suggested to stash sk in fragment queue and made
    an initial patch. However there is a problem with this: If skb is refragmented again right after,
    ip_do_fragment() will copy head->sk to the new fragments, and sets up destructor to sock_wfree. IOW, we
    have no choice but to fix up sk_wmem accouting to reflect the fully reassembled skb, else wmem will
    underflow. This change moves the orphan down into the core, to last possible moment. As ip_defrag_offset
    is aliased with sk_buff->sk member, we must move the offset into the FRAG_CB, else skb->sk gets clobbered.
    This allows to delay the orphaning long enough to learn if the skb has to be queued or if the skb is
    completing the reasm queue. In the former case, things work as before, skb is orphaned. This is safe
    because skb gets queued/stolen and won't continue past reasm engine. In the latter case, we will steal the
    skb->sk reference, reattach it to the head skb, and fix up wmem accouting when inet_frag inflates
    truesize. (CVE-2024-26921)

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-2024-26921");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2024-26921");
  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:P/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-2024-26921");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2024/04/18");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

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  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("set_linux_os_id.nasl", "ssh_get_info2.nasl");
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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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          {"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');
}