Linux Distros Unpatched Vulnerability : CVE-2022-49101

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

include('compat.inc');

if (description)
{
  script_id(225128);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/03/05");

  script_cve_id("CVE-2022-49101");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-49101");

  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: xen: delay xen_hvm_init_time_ops() if
    kdump is boot on vcpu>=32 The sched_clock() can be used very early since commit 857baa87b642
    (sched/clock: Enable sched clock early). In addition, with commit 38669ba205d1 (x86/xen/time: Output
    xen sched_clock time from 0), kdump kernel in Xen HVM guest may panic at very early stage when accessing
    &__this_cpu_read(xen_vcpu)->time as in below: setup_arch() -> init_hypervisor_platform() ->
    x86_init.hyper.init_platform = xen_hvm_guest_init() -> xen_hvm_init_time_ops() -> xen_clocksource_read()
    -> src = &__this_cpu_read(xen_vcpu)->time; This is because Xen HVM supports at most MAX_VIRT_CPUS=32
    'vcpu_info' embedded inside 'shared_info' during early stage until xen_vcpu_setup() is used to
    allocate/relocate 'vcpu_info' for boot cpu at arbitrary address. However, when Xen HVM guest panic on vcpu
    >= 32, since xen_vcpu_info_reset(0) would set per_cpu(xen_vcpu, cpu) = NULL when vcpu >= 32,
    xen_clocksource_read() on vcpu >= 32 would panic. This patch calls xen_hvm_init_time_ops() again later in
    xen_hvm_smp_prepare_boot_cpu() after the 'vcpu_info' for boot vcpu is registered when the boot vcpu is >=
    32. This issue can be reproduced on purpose via below command at the guest side when kdump/kexec is
    enabled: taskset -c 33 echo c > /proc/sysrq-trigger The bugfix for PVM is not implemented due to the
    lack of testing environment. [boris: xen_hvm_init_time_ops() returns on errors instead of jumping to end]
    (CVE-2022-49101)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  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:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-49101");

  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:"2025/02/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/RedHat/release", "Host/RedHat/rpm-list");

  exit(0);
}
include('vdf.inc');

# @tvdl-content
var vuln_data = {
 "metadata": {
  "spec_version": "1.0p"
 },
 "requires": [
  {
   "scope": "scan_config",
   "match": {
    "vendor_unpatched": true
   }
  },
  {
   "scope": "target",
   "match": {
    "os": "linux"
   }
  }
 ],
 "report": {
  "report_type": "unpatched"
 },
 "checks": [
  {
   "product": {
    "name": [
     "kernel",
     "kernel-rt"
    ],
    "type": "rpm_package"
   },
   "check_algorithm": "rpm",
   "constraints": [
    {
     "requires": [
      {
       "scope": "target",
       "match": {
        "distro": "redhat"
       }
      },
      {
       "scope": "target",
       "match": {
        "os_version": "9"
       }
      }
     ]
    }
   ]
  }
 ]
};

var vdf_res = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_WARNING);
vdf::handle_check_and_report_errors(vdf_result: vdf_res);