| Source | Link |
|---|---|
| ubuntu | www.ubuntu.com/security/CVE-2022-49834 |
| cve | www.cve.mitre.org/cgi-bin/cvename.cgi |
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('compat.inc');
if (description)
{
script_id(244410);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");
script_cve_id("CVE-2022-49834");
script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-49834");
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.
- nilfs2: fix use-after-free bug of ns_writer on remount If a nilfs2 filesystem is downgraded to read-only
due to metadata corruption on disk and is remounted read/write, or if emergency read-only remount is
performed, detaching a log writer and synchronizing the filesystem can be done at the same time. In these
cases, use-after-free of the log writer (hereinafter nilfs->ns_writer) can happen as shown in the scenario
below: Task1 Task2 -------------------------------- ------------------------------ nilfs_construct_segment
nilfs_segctor_sync init_wait init_waitqueue_entry add_wait_queue schedule nilfs_remount (R/W remount case)
nilfs_attach_log_writer nilfs_detach_log_writer nilfs_segctor_destroy kfree finish_wait
_raw_spin_lock_irqsave __raw_spin_lock_irqsave do_raw_spin_lock debug_spin_lock_before <-- use-after-free
While Task1 is sleeping, nilfs->ns_writer is freed by Task2. After Task1 waked up, Task1 accesses
nilfs->ns_writer which is already freed. This scenario diagram is based on the Shigeru Yoshida's post [1].
This patch fixes the issue by not detaching nilfs->ns_writer on remount so that this UAF race doesn't
happen. Along with this change, this patch also inserts a few necessary read-only checks with superblock
instance where only the ns_writer pointer was used to check if the filesystem is read-only.
(CVE-2022-49834)
Note that Nessus relies on the presence of the package as reported by the vendor.");
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script_set_attribute(attribute:"solution", value:
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script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:P");
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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:"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/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");
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 = {
"Ubuntu Linux-14.04": {
"package_manager": "dpkg-l",
"constraints": [
{
"release": "14.04",
"pkgs": [
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{"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-cloud-tools-4.4.0"},
{"reference": "linux-cloud-tools-common"},
{"reference": "linux-doc"},
{"reference": "linux-headers-4.4.0"},
{"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-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-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"},
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{"reference": "linux-oracle-5.3"},
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{"reference": "linux-udebs-azure"},
{"reference": "linux-udebs-oem"}
]
}
]
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{
"release": "20.04",
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{"reference": "linux-cloud-tools-5.4.0"},
{"reference": "linux-cloud-tools-5.6.0"},
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{"reference": "linux-gcp-5.13"},
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{"reference": "linux-headers-5.6.0"},
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{"reference": "linux-hwe-5.13"},
{"reference": "linux-hwe-5.8"},
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{"reference": "linux-image-unsigned-5.6.0"},
{"reference": "linux-intel-5.13"},
{"reference": "linux-libc-dev"},
{"reference": "linux-modules-5.4.0"},
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{"reference": "linux-oracle-5.11"},
{"reference": "linux-oracle-5.13"},
{"reference": "linux-oracle-5.8"},
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{"reference": "linux-riscv-tools-5.4.0"},
{"reference": "linux-tools-5.4.0"},
{"reference": "linux-tools-5.6.0"},
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]
}
]
},
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"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"},
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{"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"},
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{"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"}
]
}
]
}
};
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');
}
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