Linux Distros Unpatched Vulnerability : CVE-2024-46828

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

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  script_id(229049);
  script_version("1.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2024-46828");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-46828");

  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: sched: sch_cake: fix bulk flow
    accounting logic for host fairness In sch_cake, we keep track of the count of active bulk flows per host,
    when running in dst/src host fairness mode, which is used as the round-robin weight when iterating through
    flows. The count of active bulk flows is updated whenever a flow changes state. This has a peculiar
    interaction with the hash collision handling: when a hash collision occurs (after the set-associative
    hashing), the state of the hash bucket is simply updated to match the new packet that collided, and if
    host fairness is enabled, that also means assigning new per-host state to the flow. For this reason, the
    bulk flow counters of the host(s) assigned to the flow are decremented, before new state is assigned (and
    the counters, which may not belong to the same host anymore, are incremented again). Back when this code
    was introduced, the host fairness mode was always enabled, so the decrement was unconditional. When the
    configuration flags were introduced the *increment* was made conditional, but the *decrement* was not.
    Which of course can lead to a spurious decrement (and associated wrap-around to U16_MAX). AFAICT, when
    host fairness is disabled, the decrement and wrap-around happens as soon as a hash collision occurs (which
    is not that common in itself, due to the set-associative hashing). However, in most cases this is
    harmless, as the value is only used when host fairness mode is enabled. So in order to trigger an array
    overflow, sch_cake has to first be configured with host fairness disabled, and while running in this mode,
    a hash collision has to occur to cause the overflow. Then, the qdisc has to be reconfigured to enable host
    fairness, which leads to the array out-of-bounds because the wrapped-around value is retained and used as
    an array index. It seems that syzbot managed to trigger this, which is quite impressive in its own right.
    This patch fixes the issue by introducing the same conditional check on decrement as is used on increment.
    The original bug predates the upstreaming of cake, but the commit listed in the Fixes tag touched that
    code, meaning that this patch won't apply before that. (CVE-2024-46828)

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-2024-46828");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2024-46828");
  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:M/Au:S/C:C/I:C/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:H/I:H/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-2024-46828");

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  script_set_attribute(attribute:"vuln_publication_date", value:"2024/09/27");
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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-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');
}