Linux Distros Unpatched Vulnerability : CVE-2026-23016

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

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  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/13");

  script_cve_id("CVE-2026-23016");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-23016");

  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: frags: drop fraglist conntrack
    references Jakub added a warning in nf_conntrack_cleanup_net_list() to make debugging leaked
    skbs/conntrack references more obvious. syzbot reports this as triggering, and I can also reproduce this
    via ip_defrag.sh selftest: conntrack cleanup blocked for 60s WARNING:
    net/netfilter/nf_conntrack_core.c:2512 [..] conntrack clenups gets stuck because there are skbs with still
    hold nf_conn references via their frag_list. net.core.skb_defer_max=0 makes the hang disappear. Eric
    Dumazet points out that skb_release_head_state() doesn't follow the fraglist. ip_defrag.sh can only
    reproduce this problem since commit 6471658dc66c (udp: use skb_attempt_defer_free()), but AFAICS this
    problem could happen with TCP as well if pmtu discovery is off. The relevant problem path for udp is: 1.
    netns emits fragmented packets 2. nf_defrag_v6_hook reassembles them (in output hook) 3. reassembled skb
    is tracked (skb owns nf_conn reference) 4. ip6_output refragments 5. refragmented packets also own nf_conn
    reference (ip6_fragment calls ip6_copy_metadata()) 6. on input path, nf_defrag_v6_hook skips
    defragmentation: the fragments already have skb->nf_conn attached 7. skbs are reassembled via
    ipv6_frag_rcv() 8. skb_consume_udp -> skb_attempt_defer_free() -> skb ends up in pcpu freelist, but still
    has nf_conn reference. Possible solutions: 1 let defrag engine drop nf_conn entry, OR 2 export
    kick_defer_list_purge() and call it from the conntrack netns exit callback, OR 3 add skb_has_frag_list()
    check to skb_attempt_defer_free() 2 & 3 also solve ip_defrag.sh hang but share same drawback: Such
    reassembled skbs, queued to socket, can prevent conntrack module removal until userspace has consumed the
    packet. While both tcp and udp stack do call nf_reset_ct() before placing skb on socket queue, that
    function doesn't iterate frag_list skbs. Therefore drop nf_conn entries when they are placed in defrag
    queue. Keep the nf_conn entry of the first (offset 0) skb so that reassembled skb retains nf_conn entry
    for sake of TX path. Note that fixes tag is incorrect; it points to the commit introducing the
    'ip_defrag.sh reproducible problem': no need to backport this patch to every stable kernel.
    (CVE-2026-23016)

Note that Nessus relies on the presence of the package as reported by the vendor.");
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  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: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-2026-23016");

  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:"2026/01/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/31");

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  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");
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  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');

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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
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  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
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        "release": "18.04",
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      }
    ]
  }
};

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_HOLE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}