Linux Distros Unpatched Vulnerability : CVE-2025-21823

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

include('compat.inc');

if (description)
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  script_version("1.15");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2025-21823");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-21823");

  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.

  - batman-adv: Drop unmanaged ELP metric worker The ELP worker needs to calculate new metric values for all
    neighbors reachable over an interface. Some of the used metric sources require locks which might need to
    sleep. This sleep is incompatible with the RCU list iterator used for the recorded neighbors. The initial
    approach to work around of this problem was to queue another work item per neighbor and then run this in a
    new context. Even when this solved the RCU vs might_sleep() conflict, it has a major problems: Nothing was
    stopping the work item in case it is not needed anymore - for example because one of the related
    interfaces was removed or the batman-adv module was unloaded - resulting in potential invalid memory
    accesses. Directly canceling the metric worker also has various problems: * cancel_work_sync for a to-be-
    deactivated interface is called with rtnl_lock held. But the code in the ELP metric worker also tries to
    use rtnl_lock() - which will never return in this case. This also means that cancel_work_sync would never
    return because it is waiting for the worker to finish. * iterating over the neighbor list for the to-be-
    deactivated interface is currently done using the RCU specific methods. Which means that it is possible to
    miss items when iterating over it without the associated spinlock - a behaviour which is acceptable for a
    periodic metric check but not for a cleanup routine (which must stop all still running workers) The
    better approch is to get rid of the per interface neighbor metric worker and handle everything in the
    interface worker. The original problems are solved by: * creating a list of neighbors which require new
    metric information inside the RCU protected context, gathering the metric according to the new list
    outside the RCU protected context * only use rcu_trylock inside metric gathering code to avoid a deadlock
    when the cancel_delayed_work_sync is called in the interface removal code (which is called with the
    rtnl_lock held) (CVE-2025-21823)

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-2025-21823");
  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: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-2025-21823");

  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:"2025/02/27");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/06");

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  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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  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 = {
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    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "14.04",
        "pkgs": [
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          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"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"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "linux-azure-fde"}
        ]
      }
    ]
  }
};

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