#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('compat.inc');
if (description)
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script_id(231522);
script_version("1.14");
script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");
script_cve_id("CVE-2024-56644");
script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-56644");
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/ipv6: release expired exception dst cached in socket Dst objects get leaked in ip6_negative_advice()
when this function is executed for an expired IPv6 route located in the exception table. There are several
conditions that must be fulfilled for the leak to occur: * an ICMPv6 packet indicating a change of the MTU
for the path is received, resulting in an exception dst being created * a TCP connection that uses the
exception dst for routing packets must start timing out so that TCP begins retransmissions * after the
exception dst expires, the FIB6 garbage collector must not run before TCP executes ip6_negative_advice()
for the expired exception dst When TCP executes ip6_negative_advice() for an exception dst that has
expired and if no other socket holds a reference to the exception dst, the refcount of the exception dst
is 2, which corresponds to the increment made by dst_init() and the increment made by the TCP socket for
which the connection is timing out. The refcount made by the socket is never released. The refcount of the
dst is decremented in sk_dst_reset() but that decrement is counteracted by a dst_hold() intentionally
placed just before the sk_dst_reset() in ip6_negative_advice(). After ip6_negative_advice() has finished,
there is no other object tied to the dst. The socket lost its reference stored in sk_dst_cache and the dst
is no longer in the exception table. The exception dst becomes a leaked object. As a result of this dst
leak, an unbalanced refcount is reported for the loopback device of a net namespace being destroyed under
kernels that do not contain e5f80fcf869a (ipv6: give an IPv6 dev to blackhole_netdev):
unregister_netdevice: waiting for lo to become free. Usage count = 2 Fix the dst leak by removing the
dst_hold() in ip6_negative_advice(). The patch that introduced the dst_hold() in ip6_negative_advice() was
92f1655aa2b22 (net: fix __dst_negative_advice() race). But 92f1655aa2b22 merely refactored the code with
regards to the dst refcount so the issue was present even before 92f1655aa2b22. The bug was introduced in
54c1a859efd9f (ipv6: Don't drop cache route entry unless timer actually expired.) where the expired
cached route is deleted and the sk_dst_cache member of the socket is set to NULL by calling
dst_negative_advice() but the refcount belonging to the socket is left unbalanced. The IPv4 version -
ipv4_negative_advice() - is not affected by this bug. When the TCP connection times out
ipv4_negative_advice() merely resets the sk_dst_cache of the socket while decrementing the refcount of the
exception dst. (CVE-2024-56644)
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-2024-56644");
script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2024-56644");
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-2024-56644");
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:"2024/12/27");
script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/06");
script_set_attribute(attribute:"plugin_type", value:"local");
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script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
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");
script_require_keys("Host/OS/identifier", "Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
script_require_ports("Host/OS/CentOS Linux-8", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Red Hat Enterprise Linux-9", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.04");
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/CentOS/rpm-list")) && 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 = {
"Ubuntu Linux-14.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "14.04",
"pkgs": [
{"reference": "linux-aws"},
{"reference": "linux-azure"},
{"reference": "linux-cloud-tools-3.13.0"},
{"reference": "linux-cloud-tools-common"},
{"reference": "linux-doc"},
{"reference": "linux-headers-3.13.0"},
{"reference": "linux-image-3.13.0"},
{"reference": "linux-image-extra-3.13.0"},
{"reference": "linux-libc-dev"},
{"reference": "linux-lts-xenial"},
{"reference": "linux-source-3.13.0"},
{"reference": "linux-tools-3.13.0"},
{"reference": "linux-tools-common"},
{"reference": "linux-udebs-generic"},
{"reference": "linux-udebs-generic-lpae"},
{"reference": "linux-udebs-lowlatency"}
]
}
]
},
"Ubuntu Linux-16.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "16.04",
"pkgs": [
{"reference": "linux-aws"},
{"reference": "linux-aws-hwe"},
{"reference": "linux-azure"},
{"reference": "linux-cloud-tools-4.4.0"},
{"reference": "linux-cloud-tools-common"},
{"reference": "linux-doc"},
{"reference": "linux-gcp"},
{"reference": "linux-headers-4.4.0"},
{"reference": "linux-hwe"},
{"reference": "linux-hwe-edge"},
{"reference": "linux-image-4.4.0"},
{"reference": "linux-image-extra-4.4.0"},
{"reference": "linux-kvm"},
{"reference": "linux-libc-dev"},
{"reference": "linux-oracle"},
{"reference": "linux-source-4.4.0"},
{"reference": "linux-tools-4.4.0"},
{"reference": "linux-tools-common"},
{"reference": "linux-udebs-generic"},
{"reference": "linux-udebs-generic-lpae"},
{"reference": "linux-udebs-lowlatency"}
]
}
]
},
"Ubuntu Linux-18.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "18.04",
"pkgs": [
{"reference": "linux-aws-5.0"},
{"reference": "linux-aws-5.3"},
{"reference": "linux-aws-cloud-tools-4.15.0"},
{"reference": "linux-aws-headers-4.15.0"},
{"reference": "linux-aws-tools-4.15.0"},
{"reference": "linux-azure-4.15"},
{"reference": "linux-azure-5.3"},
{"reference": "linux-azure-cloud-tools-4.15.0"},
{"reference": "linux-azure-edge"},
{"reference": "linux-azure-headers-4.15.0"},
{"reference": "linux-azure-tools-4.15.0"},
{"reference": "linux-cloud-tools-4.15.0"},
{"reference": "linux-cloud-tools-common"},
{"reference": "linux-doc"},
{"reference": "linux-gcp-4.15"},
{"reference": "linux-gcp-5.3"},
{"reference": "linux-gcp-headers-4.15.0"},
{"reference": "linux-gcp-tools-4.15.0"},
{"reference": "linux-gke-4.15"},
{"reference": "linux-gke-5.4"},
{"reference": "linux-gkeop-5.4"},
{"reference": "linux-headers-4.15.0"},
{"reference": "linux-hwe"},
{"reference": "linux-hwe-edge"},
{"reference": "linux-image-4.15.0"},
{"reference": "linux-image-unsigned-4.15.0"},
{"reference": "linux-kvm-cloud-tools-4.15.0"},
{"reference": "linux-kvm-headers-4.15.0"},
{"reference": "linux-kvm-tools-4.15.0"},
{"reference": "linux-libc-dev"},
{"reference": "linux-modules-4.15.0"},
{"reference": "linux-modules-extra-4.15.0"},
{"reference": "linux-oem-headers-4.15.0"},
{"reference": "linux-oem-tools-4.15.0"},
{"reference": "linux-oracle"},
{"reference": "linux-oracle-5.0"},
{"reference": "linux-oracle-5.3"},
{"reference": "linux-source-4.15.0"},
{"reference": "linux-tools-4.15.0"},
{"reference": "linux-tools-common"},
{"reference": "linux-tools-host"},
{"reference": "linux-udebs-aws"},
{"reference": "linux-udebs-azure"},
{"reference": "linux-udebs-generic"},
{"reference": "linux-udebs-generic-lpae"},
{"reference": "linux-udebs-kvm"},
{"reference": "linux-udebs-oem"}
]
}
]
},
"Ubuntu Linux-20.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "20.04",
"pkgs": [
{"reference": "linux-aws-5.11"},
{"reference": "linux-aws-5.13"},
{"reference": "linux-aws-5.8"},
{"reference": "linux-azure-5.11"},
{"reference": "linux-azure-5.13"},
{"reference": "linux-azure-5.8"},
{"reference": "linux-azure-fde"},
{"reference": "linux-buildinfo-5.4.0"},
{"reference": "linux-buildinfo-5.6.0"},
{"reference": "linux-cloud-tools-5.4.0"},
{"reference": "linux-cloud-tools-5.6.0"},
{"reference": "linux-gcp-5.11"},
{"reference": "linux-gcp-5.13"},
{"reference": "linux-gcp-5.8"},
{"reference": "linux-gke"},
{"reference": "linux-gke-5.15"},
{"reference": "linux-gkeop"},
{"reference": "linux-gkeop-5.15"},
{"reference": "linux-headers-5.4.0"},
{"reference": "linux-headers-5.6.0"},
{"reference": "linux-hwe-5.11"},
{"reference": "linux-hwe-5.13"},
{"reference": "linux-hwe-5.8"},
{"reference": "linux-image-5.4.0"},
{"reference": "linux-image-unsigned-5.6.0"},
{"reference": "linux-intel-5.13"},
{"reference": "linux-libc-dev"},
{"reference": "linux-modules-5.4.0"},
{"reference": "linux-modules-5.6.0"},
{"reference": "linux-modules-extra-5.4.0"},
{"reference": "linux-modules-extra-5.6.0"},
{"reference": "linux-oem-5.10"},
{"reference": "linux-oem-5.13"},
{"reference": "linux-oem-5.14"},
{"reference": "linux-oem-5.6-headers-5.6.0"},
{"reference": "linux-oem-5.6-tools-5.6.0"},
{"reference": "linux-oem-5.6-tools-common"},
{"reference": "linux-oem-5.6-tools-host"},
{"reference": "linux-oracle-5.11"},
{"reference": "linux-oracle-5.13"},
{"reference": "linux-oracle-5.8"},
{"reference": "linux-raspi2"},
{"reference": "linux-riscv-5.11"},
{"reference": "linux-riscv-5.8"},
{"reference": "linux-riscv-headers-5.4.0"},
{"reference": "linux-riscv-tools-5.4.0"},
{"reference": "linux-tools-5.4.0"},
{"reference": "linux-tools-5.6.0"},
{"reference": "linux-udebs-generic"},
{"reference": "linux-udebs-oem"}
]
}
]
},
"Ubuntu Linux-22.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "22.04",
"pkgs": [
{"reference": "linux-allwinner-5.19"},
{"reference": "linux-aws-5.19"},
{"reference": "linux-aws-6.2"},
{"reference": "linux-aws-6.5"},
{"reference": "linux-azure-5.19"},
{"reference": "linux-azure-6.2"},
{"reference": "linux-azure-6.5"},
{"reference": "linux-azure-fde"},
{"reference": "linux-azure-fde-5.19"},
{"reference": "linux-azure-fde-6.2"},
{"reference": "linux-buildinfo-5.15.0"},
{"reference": "linux-buildinfo-5.17.0"},
{"reference": "linux-cloud-tools-5.15.0"},
{"reference": "linux-cloud-tools-5.17.0"},
{"reference": "linux-gcp-5.19"},
{"reference": "linux-gcp-6.2"},
{"reference": "linux-gcp-6.5"},
{"reference": "linux-headers-5.15.0"},
{"reference": "linux-headers-5.17.0"},
{"reference": "linux-hwe-5.19"},
{"reference": "linux-hwe-6.2"},
{"reference": "linux-hwe-6.5"},
{"reference": "linux-image-5.15.0"},
{"reference": "linux-image-unsigned-5.17.0"},
{"reference": "linux-lowlatency-hwe-5.19"},
{"reference": "linux-lowlatency-hwe-6.2"},
{"reference": "linux-lowlatency-hwe-6.5"},
{"reference": "linux-modules-5.15.0"},
{"reference": "linux-modules-5.17.0"},
{"reference": "linux-modules-extra-5.15.0"},
{"reference": "linux-modules-extra-5.17.0"},
{"reference": "linux-nvidia-6.2"},
{"reference": "linux-nvidia-6.5"},
{"reference": "linux-oem-5.17-headers-5.17.0"},
{"reference": "linux-oem-5.17-tools-5.17.0"},
{"reference": "linux-oem-5.17-tools-host"},
{"reference": "linux-oem-6.0"},
{"reference": "linux-oem-6.1"},
{"reference": "linux-oem-6.5"},
{"reference": "linux-oracle-6.5"},
{"reference": "linux-realtime"},
{"reference": "linux-riscv-5.19"},
{"reference": "linux-riscv-6.5"},
{"reference": "linux-riscv-headers-5.15.0"},
{"reference": "linux-riscv-tools-5.15.0"},
{"reference": "linux-starfive-5.19"},
{"reference": "linux-starfive-6.2"},
{"reference": "linux-starfive-6.5"},
{"reference": "linux-tools-5.15.0"},
{"reference": "linux-tools-5.17.0"}
]
}
]
},
"Ubuntu Linux-24.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "24.04",
"pkgs": [
{"reference": "linux-raspi-realtime"},
{"reference": "linux-realtime"}
]
}
]
},
"Ubuntu Linux-25.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "25.04",
"pkgs": [
{"reference": "linux-azure-fde"}
]
}
]
},
"CentOS Linux-8": {
"package_manager": "rpm-list",
"constraints": [
{
"release": "8",
"pkgs": [
{"reference": "kernel-rt"},
{"reference": "kernel-rt-core"},
{"reference": "kernel-rt-debug"},
{"reference": "kernel-rt-debug-core"},
{"reference": "kernel-rt-debug-devel"},
{"reference": "kernel-rt-debug-kvm"},
{"reference": "kernel-rt-debug-modules"},
{"reference": "kernel-rt-debug-modules-extra"},
{"reference": "kernel-rt-debug-modules-internal"},
{"reference": "kernel-rt-devel"},
{"reference": "kernel-rt-kvm"},
{"reference": "kernel-rt-modules"},
{"reference": "kernel-rt-modules-extra"},
{"reference": "kernel-rt-modules-internal"},
{"reference": "kernel-rt-selftests-internal"}
]
}
]
},
"Red Hat Enterprise Linux-8": {
"package_manager": "rpm-list",
"constraints": [
{
"release": "8",
"pkgs": [
{"reference": "kernel-rt"},
{"reference": "kernel-rt-core"},
{"reference": "kernel-rt-debug"},
{"reference": "kernel-rt-debug-core"},
{"reference": "kernel-rt-debug-devel"},
{"reference": "kernel-rt-debug-kvm"},
{"reference": "kernel-rt-debug-modules"},
{"reference": "kernel-rt-debug-modules-extra"},
{"reference": "kernel-rt-debug-modules-internal"},
{"reference": "kernel-rt-devel"},
{"reference": "kernel-rt-kvm"},
{"reference": "kernel-rt-modules"},
{"reference": "kernel-rt-modules-extra"},
{"reference": "kernel-rt-modules-internal"},
{"reference": "kernel-rt-selftests-internal"}
]
}
]
},
"Red Hat Enterprise Linux-9": {
"package_manager": "rpm-list",
"constraints": [
{
"release": "9",
"pkgs": [
{"reference": "kernel-rt"},
{"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"}
]
}
]
}
};
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');
}
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