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Linux Distros Unpatched Vulnerability : CVE-2024-14040

🗓️ 26 Jul 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

Linux systems with unpatched CVE-2024-14040: nexthop weight now uses sixteen bits for ECMP.

Related
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Code
ReporterTitlePublishedViews
Family
ATTACKERKB
CVE-2024-14040
26 Jul 202606:30
attackerkb
Circl
CVE-2024-14040
27 Jul 202610:02
circl
CVE
CVE-2024-14040
26 Jul 202606:30
cve
Cvelist
CVE-2024-14040 net: nexthop: Increase weight to u16
26 Jul 202606:30
cvelist
Debian CVE
CVE-2024-14040
26 Jul 202606:30
debiancve
EUVD
EUVD-2024-55701
26 Jul 202606:30
euvd
NVD
CVE-2024-14040
26 Jul 202607:16
nvd
OSV
CVE-2024-14040 net: nexthop: Increase weight to u16
26 Jul 202606:30
osv
OSV
DEBIAN-CVE-2024-14040
26 Jul 202607:16
osv
OSV
UBUNTU-CVE-2024-14040
27 Jul 202600:00
osv
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#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
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  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-14040");

  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.

  - net: nexthop: Increase weight to u16 In CLOS networks, as link failures occur at various points in the
    network, ECMP weights of the involved nodes are adjusted to compensate. With high fan-out of the involved
    nodes, and overall high number of nodes, a (non-)ECMP weight ratio that we would like to configure does
    not fit into 8 bits. Instead of, say, 255:254, we might like to configure something like 1000:999. For
    these deployments, the 8-bit weight may not be enough. To that end, in this patch increase the next hop
    weight from u8 to u16. Increasing the width of an integral type can be tricky, because while the code
    still compiles, the types may not check out anymore, and numerical errors come up. To prevent this, the
    conversion was done in two steps. First the type was changed from u8 to a single-member structure, which
    invalidated all uses of the field. This allowed going through them one by one and audit for type
    correctness. Then the structure was replaced with a vanilla u16 again. This should ensure that no place
    was missed. The UAPI for configuring nexthop group members is that an attribute NHA_GROUP carries an array
    of struct nexthop_grp entries: struct nexthop_grp { __u32 id; /* nexthop id - must exist */ __u8 weight;
    /* weight of this nexthop */ __u8 resvd1; __u16 resvd2; }; The field resvd1 is currently validated and
    required to be zero. We can lift this requirement and carry high-order bits of the weight in the reserved
    field: struct nexthop_grp { __u32 id; /* nexthop id - must exist */ __u8 weight; /* weight of this nexthop
    */ __u8 weight_high; __u16 resvd2; }; Keeping the fields split this way was chosen in case an existing
    userspace makes assumptions about the width of the weight field, and to sidestep any endianness issues.
    The weight field is currently encoded as the weight value minus one, because weight of 0 is invalid. This
    same trick is impossible for the new weight_high field, because zero must mean actual zero. With this in
    place: - Old userspace is guaranteed to carry weight_high of 0, therefore configuring 8-bit weights as
    appropriate. When dumping nexthops with 16-bit weight, it would only show the lower 8 bits. But
    configuring such nexthops implies existence of userspace aware of the extension in the first place. - New
    userspace talking to an old kernel will work as long as it only attempts to configure 8-bit weights, where
    the high-order bits are zero. Old kernel will bounce attempts at configuring >8-bit weights. Renaming
    reserved fields as they are allocated for some purpose is commonly done in Linux. Whoever touches a
    reserved field is doing so at their own risk. nexthop_grp::resvd1 in particular is currently used by at
    least strace, however they carry an own copy of UAPI headers, and the conversion should be trivial. A
    helper is provided for decoding the weight out of the two fields. Forcing a conversion seems preferable to
    bending backwards and introducing anonymous unions or whatever. (CVE-2024-14040)

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-2024-14040");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2024-14040");
  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:M/Au:S/C:N/I:P/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:L/A:H");
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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.");

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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');

var distro_constraints_array = {
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    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "12",
        "pkgs": [
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          {"reference": "ext4-modules-6.1.0-50-alpha-generic-di"},
          {"reference": "fat-modules-6.1.0-50-alpha-generic-di"},
          {"reference": "isofs-modules-6.1.0-50-alpha-generic-di"},
          {"reference": "jfs-modules-6.1.0-50-alpha-generic-di"},
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          {"reference": "scsi-nic-modules-5.10.0-32-alpha-generic-di"},
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          {"reference": "usb-serial-modules-5.10.0-32-alpha-generic-di"},
          {"reference": "usbip"}
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          {"reference": "kernel-64k-debug-modules-extra"},
          {"reference": "kernel-64k-debug-modules-internal"},
          {"reference": "kernel-64k-debug-modules-partner"},
          {"reference": "kernel-64k-devel"},
          {"reference": "kernel-64k-devel-matched"},
          {"reference": "kernel-64k-modules"},
          {"reference": "kernel-64k-modules-core"},
          {"reference": "kernel-64k-modules-extra"},
          {"reference": "kernel-64k-modules-internal"},
          {"reference": "kernel-64k-modules-partner"},
          {"reference": "kernel-abi-stablelists"},
          {"reference": "kernel-core"},
          {"reference": "kernel-cross-headers"},
          {"reference": "kernel-debug"},
          {"reference": "kernel-debug-core"},
          {"reference": "kernel-debug-devel"},
          {"reference": "kernel-debug-devel-matched"},
          {"reference": "kernel-debug-modules"},
          {"reference": "kernel-debug-modules-core"},
          {"reference": "kernel-debug-modules-extra"},
          {"reference": "kernel-debug-modules-internal"},
          {"reference": "kernel-debug-modules-partner"},
          {"reference": "kernel-debug-uki-virt"},
          {"reference": "kernel-debug-uki-virt-addons"},
          {"reference": "kernel-devel"},
          {"reference": "kernel-devel-matched"},
          {"reference": "kernel-doc"},
          {"reference": "kernel-headers"},
          {"reference": "kernel-ipaclones-internal"},
          {"reference": "kernel-modules"},
          {"reference": "kernel-modules-core"},
          {"reference": "kernel-modules-extra"},
          {"reference": "kernel-modules-internal"},
          {"reference": "kernel-modules-partner"},
          {"reference": "kernel-rt"},
          {"reference": "kernel-rt-64k"},
          {"reference": "kernel-rt-64k-core"},
          {"reference": "kernel-rt-64k-debug"},
          {"reference": "kernel-rt-64k-debug-core"},
          {"reference": "kernel-rt-64k-debug-devel"},
          {"reference": "kernel-rt-64k-debug-devel-matched"},
          {"reference": "kernel-rt-64k-debug-kvm"},
          {"reference": "kernel-rt-64k-debug-modules"},
          {"reference": "kernel-rt-64k-debug-modules-core"},
          {"reference": "kernel-rt-64k-debug-modules-extra"},
          {"reference": "kernel-rt-64k-debug-modules-internal"},
          {"reference": "kernel-rt-64k-debug-modules-partner"},
          {"reference": "kernel-rt-64k-devel"},
          {"reference": "kernel-rt-64k-devel-matched"},
          {"reference": "kernel-rt-64k-kvm"},
          {"reference": "kernel-rt-64k-modules"},
          {"reference": "kernel-rt-64k-modules-core"},
          {"reference": "kernel-rt-64k-modules-extra"},
          {"reference": "kernel-rt-64k-modules-internal"},
          {"reference": "kernel-rt-64k-modules-partner"},
          {"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"},
          {"reference": "kernel-selftests-internal"},
          {"reference": "kernel-tools"},
          {"reference": "kernel-tools-libs"},
          {"reference": "kernel-tools-libs-devel"},
          {"reference": "kernel-uki-virt"},
          {"reference": "kernel-uki-virt-addons"},
          {"reference": "kernel-zfcpdump"},
          {"reference": "kernel-zfcpdump-core"},
          {"reference": "kernel-zfcpdump-devel"},
          {"reference": "kernel-zfcpdump-devel-matched"},
          {"reference": "kernel-zfcpdump-modules"},
          {"reference": "kernel-zfcpdump-modules-core"},
          {"reference": "kernel-zfcpdump-modules-extra"},
          {"reference": "kernel-zfcpdump-modules-internal"},
          {"reference": "kernel-zfcpdump-modules-partner"},
          {"reference": "libperf"},
          {"reference": "libperf-devel"},
          {"reference": "perf"},
          {"reference": "python3-perf"},
          {"reference": "rtla"},
          {"reference": "rv"}
        ]
      }
    ]
  }
};

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 third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

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');
}

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27 Jul 2026 00:00Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.17.8
EPSS0.0014
4