#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
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script_version("1.32");
script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");
script_cve_id("CVE-2025-38248");
script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-38248");
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.
- bridge: mcast: Fix use-after-free during router port configuration The bridge maintains a global list of
ports behind which a multicast router resides. The list is consulted during forwarding to ensure multicast
packets are forwarded to these ports even if the ports are not member in the matching MDB entry. When per-
VLAN multicast snooping is enabled, the per-port multicast context is disabled on each port and the port
is removed from the global router port list: # ip link add name br1 up type bridge vlan_filtering 1
mcast_snooping 1 # ip link add name dummy1 up master br1 type dummy # ip link set dev dummy1 type
bridge_slave mcast_router 2 $ bridge -d mdb show | grep router router ports on br1: dummy1 # ip link set
dev br1 type bridge mcast_vlan_snooping 1 $ bridge -d mdb show | grep router However, the port can be re-
added to the global list even when per-VLAN multicast snooping is enabled: # ip link set dev dummy1 type
bridge_slave mcast_router 0 # ip link set dev dummy1 type bridge_slave mcast_router 2 $ bridge -d mdb show
| grep router router ports on br1: dummy1 Since commit 4b30ae9adb04 (net: bridge: mcast: re-implement
br_multicast_{enable, disable}_port functions), when per-VLAN multicast snooping is enabled, multicast
disablement on a port will disable the per-{port, VLAN} multicast contexts and not the per-port one. As a
result, a port will remain in the global router port list even after it is deleted. This will lead to a
use-after-free [1] when the list is traversed (when adding a new port to the list, for example): # ip link
del dev dummy1 # ip link add name dummy2 up master br1 type dummy # ip link set dev dummy2 type
bridge_slave mcast_router 2 Similarly, stale entries can also be found in the per-VLAN router port list.
When per-VLAN multicast snooping is disabled, the per-{port, VLAN} contexts are disabled on each port and
the port is removed from the per-VLAN router port list: # ip link add name br1 up type bridge
vlan_filtering 1 mcast_snooping 1 mcast_vlan_snooping 1 # ip link add name dummy1 up master br1 type dummy
# bridge vlan add vid 2 dev dummy1 # bridge vlan global set vid 2 dev br1 mcast_snooping 1 # bridge vlan
set vid 2 dev dummy1 mcast_router 2 $ bridge vlan global show dev br1 vid 2 | grep router router ports:
dummy1 # ip link set dev br1 type bridge mcast_vlan_snooping 0 $ bridge vlan global show dev br1 vid 2 |
grep router However, the port can be re-added to the per-VLAN list even when per-VLAN multicast snooping
is disabled: # bridge vlan set vid 2 dev dummy1 mcast_router 0 # bridge vlan set vid 2 dev dummy1
mcast_router 2 $ bridge vlan global show dev br1 vid 2 | grep router router ports: dummy1 When the VLAN is
deleted from the port, the per-{port, VLAN} multicast context will not be disabled since multicast
snooping is not enabled on the VLAN. As a result, the port will remain in the per-VLAN router port list
even after it is no longer member in the VLAN. This will lead to a use-after-free [2] when the list is
traversed (when adding a new port to the list, for example): # ip link add name dummy2 up master br1 type
dummy # bridge vlan add vid 2 dev dummy2 # bridge vlan del vid 2 dev dummy1 # bridge vlan set vid 2 dev
dummy2 mcast_router 2 Fix these issues by removing the port from the relevant (global or per-VLAN) router
port list in br_multicast_port_ctx_deinit(). The function is invoked during port deletion with the per-
port multicast context and during VLAN deletion with the per-{port, VLAN} multicast context. Note that
deleting the multicast router timer is not enough as it only takes care of the temporary multicast router
states (1 or 3) and not the permanent one (2). [1] BUG: KASAN: slab-out-of-bounds in
br_multicast_add_router.part.0+0x3f1/0x560 Write of size 8 at addr ffff888004a67328 by task ip/384 [...]
Call Trace: <TASK> dump_stack ---truncated--- (CVE-2025-38248)
Note that Nessus relies on the presence of the package as reported by the vendor.");
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script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2025-38248");
script_set_attribute(attribute:"solution", value:
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script_set_attribute(attribute:"agent", value:"unix");
script_set_cvss_base_vector("CVSS2#AV:A/AC:M/Au:N/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");
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script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-modules");
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script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rv");
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("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");
script_require_ports("Host/OS/Debian Linux-12", "Host/OS/Red Hat Enterprise Linux-10", "Host/OS/Red Hat Enterprise Linux-9", "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-25.10");
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")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);
include('linux_unpatched.inc');
var distro_constraints_array = {
"Debian Linux-12": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "12",
"pkgs": [
{"reference": "btrfs-modules-6.1.0-47-alpha-generic-di"},
{"reference": "cdrom-core-modules-6.1.0-47-alpha-generic-di"},
{"reference": "ext4-modules-6.1.0-47-alpha-generic-di"},
{"reference": "fat-modules-6.1.0-47-alpha-generic-di"},
{"reference": "isofs-modules-6.1.0-47-alpha-generic-di"},
{"reference": "jfs-modules-6.1.0-47-alpha-generic-di"},
{"reference": "kernel-image-6.1.0-47-alpha-generic-di"},
{"reference": "linux-doc"},
{"reference": "linux-doc-6.1"},
{"reference": "linux-headers-6.1.0"},
{"reference": "linux-source"},
{"reference": "linux-source-6.1"},
{"reference": "linux-support-6.1.0"},
{"reference": "loop-modules-6.1.0-47-alpha-generic-di"},
{"reference": "nic-modules-6.1.0-47-alpha-generic-di"},
{"reference": "nic-shared-modules-6.1.0-47-alpha-generic-di"},
{"reference": "nic-wireless-modules-6.1.0-47-alpha-generic-di"},
{"reference": "pata-modules-6.1.0-47-alpha-generic-di"},
{"reference": "ppp-modules-6.1.0-47-alpha-generic-di"},
{"reference": "scsi-core-modules-6.1.0-47-alpha-generic-di"},
{"reference": "scsi-modules-6.1.0-47-alpha-generic-di"},
{"reference": "scsi-nic-modules-6.1.0-47-alpha-generic-di"},
{"reference": "serial-modules-6.1.0-47-alpha-generic-di"},
{"reference": "usb-serial-modules-6.1.0-47-alpha-generic-di"},
{"reference": "xfs-modules-6.1.0-47-alpha-generic-di"}
]
}
]
},
"Ubuntu Linux-16.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "16.04",
"pkgs": [
{"reference": "linux-hwe-edge"}
]
}
]
},
"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-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-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-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-5.0"},
{"reference": "linux-oracle-5.3"},
{"reference": "linux-tools-4.15.0"},
{"reference": "linux-udebs-azure"},
{"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-azure-fde-6.8"},
{"reference": "linux-buildinfo-5.15.0"},
{"reference": "linux-buildinfo-5.17.0"},
{"reference": "linux-cloud-tools-5.15.0"},
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{"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-intel-iot-realtime"},
{"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-azure-6.11"},
{"reference": "linux-azure-fde"},
{"reference": "linux-azure-fde-6.17"},
{"reference": "linux-azure-nvidia"},
{"reference": "linux-buildinfo-6.8.0"},
{"reference": "linux-cloud-tools-6.8.0"},
{"reference": "linux-gcp-6.11"},
{"reference": "linux-headers-6.8.0"},
{"reference": "linux-hwe-6.11"},
{"reference": "linux-image-6.8.0"},
{"reference": "linux-image-unsigned-6.8.0"},
{"reference": "linux-intel"},
{"reference": "linux-lowlatency-hwe-6.11"},
{"reference": "linux-modules-6.8.0"},
{"reference": "linux-modules-extra-6.8.0"},
{"reference": "linux-modules-ipu6-6.8.0"},
{"reference": "linux-modules-iwlwifi-6.8.0"},
{"reference": "linux-nvidia-6.11"},
{"reference": "linux-oem-6.11"},
{"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-25.10": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "25.10",
"pkgs": [
{"reference": "linux-azure-fde"}
]
}
]
},
"Red Hat Enterprise Linux-10": {
"package_manager": "rpm-list",
"constraints": [
{
"release": "10",
"pkgs": [
{"reference": "kernel"},
{"reference": "kernel-64k"},
{"reference": "kernel-64k-core"},
{"reference": "kernel-64k-debug"},
{"reference": "kernel-64k-debug-core"},
{"reference": "kernel-64k-debug-devel"},
{"reference": "kernel-64k-debug-devel-matched"},
{"reference": "kernel-64k-debug-modules"},
{"reference": "kernel-64k-debug-modules-core"},
{"reference": "kernel-64k-debug-modules-extra"},
{"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-abi-stablelists"},
{"reference": "kernel-core"},
{"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-uki-virt"},
{"reference": "kernel-devel"},
{"reference": "kernel-devel-matched"},
{"reference": "kernel-doc"},
{"reference": "kernel-modules"},
{"reference": "kernel-modules-core"},
{"reference": "kernel-modules-extra"},
{"reference": "kernel-modules-extra-matched"},
{"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-modules"},
{"reference": "kernel-rt-64k-debug-modules-core"},
{"reference": "kernel-rt-64k-debug-modules-extra"},
{"reference": "kernel-rt-64k-devel"},
{"reference": "kernel-rt-64k-modules"},
{"reference": "kernel-rt-64k-modules-core"},
{"reference": "kernel-rt-64k-modules-extra"},
{"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-core"},
{"reference": "kernel-rt-debug-modules-extra"},
{"reference": "kernel-rt-devel"},
{"reference": "kernel-rt-kvm"},
{"reference": "kernel-rt-modules"},
{"reference": "kernel-rt-modules-core"},
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{"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"},
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{"reference": "libperf"},
{"reference": "perf"},
{"reference": "python3-perf"},
{"reference": "rtla"},
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}
]
},
"Red Hat Enterprise Linux-9": {
"package_manager": "rpm-list",
"constraints": [
{
"release": "9",
"pkgs": [
{"reference": "bpftool"},
{"reference": "kernel"},
{"reference": "kernel-64k"},
{"reference": "kernel-64k-core"},
{"reference": "kernel-64k-debug"},
{"reference": "kernel-64k-debug-core"},
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{"reference": "kernel-64k-debug-modules"},
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{"reference": "kernel-64k-modules"},
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{"reference": "kernel-debug-uki-virt"},
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{"reference": "kernel-devel"},
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{"reference": "kernel-doc"},
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{"reference": "kernel-ipaclones-internal"},
{"reference": "kernel-modules"},
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{"reference": "kernel-modules-partner"},
{"reference": "kernel-rt"},
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{"reference": "kernel-rt-64k-core"},
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{"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"},
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{"reference": "kernel-rt-64k-devel"},
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{"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"},
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{"reference": "kernel-rt-debug-modules"},
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{"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 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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