Linux Distros Unpatched Vulnerability : CVE-2022-49882

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

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  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/30");

  script_cve_id("CVE-2022-49882");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-49882");

  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: KVM: Reject attempts to consume or
    refresh inactive gfn_to_pfn_cache Reject kvm_gpc_check() and kvm_gpc_refresh() if the cache is inactive.
    Not checking the active flag during refresh is particularly egregious, as KVM can end up with a valid,
    inactive cache, which can lead to a variety of use-after-free bugs, e.g. consuming a NULL kernel pointer
    or missing an mmu_notifier invalidation due to the cache not being on the list of gfns to invalidate.
    Note, active needs to be set if and only if the cache is on the list of caches, i.e. is reachable via
    mmu_notifier events. If a relevant mmu_notifier event occurs while the cache is active but not on the
    list, KVM will not acquire the cache's lock and so will not serailize the mmu_notifier event with active
    users and/or kvm_gpc_refresh(). A race between KVM_XEN_ATTR_TYPE_SHARED_INFO and KVM_XEN_HVM_EVTCHN_SEND
    can be exploited to trigger the bug. 1. Deactivate shinfo cache: kvm_xen_hvm_set_attr case
    KVM_XEN_ATTR_TYPE_SHARED_INFO kvm_gpc_deactivate kvm_gpc_unmap gpc->valid = false gpc->khva = NULL
    gpc->active = false Result: active = false, valid = false 2. Cause cache refresh: kvm_arch_vm_ioctl case
    KVM_XEN_HVM_EVTCHN_SEND kvm_xen_hvm_evtchn_send kvm_xen_set_evtchn kvm_xen_set_evtchn_fast kvm_gpc_check
    return -EWOULDBLOCK because !gpc->valid kvm_xen_set_evtchn_fast return -EWOULDBLOCK kvm_gpc_refresh
    hva_to_pfn_retry gpc->valid = true gpc->khva = not NULL Result: active = false, valid = true 3. Race ioctl
    KVM_XEN_HVM_EVTCHN_SEND against ioctl KVM_XEN_ATTR_TYPE_SHARED_INFO: kvm_arch_vm_ioctl case
    KVM_XEN_HVM_EVTCHN_SEND kvm_xen_hvm_evtchn_send kvm_xen_set_evtchn kvm_xen_set_evtchn_fast read_lock
    gpc->lock kvm_xen_hvm_set_attr case KVM_XEN_ATTR_TYPE_SHARED_INFO mutex_lock kvm->lock
    kvm_xen_shared_info_init kvm_gpc_activate gpc->khva = NULL kvm_gpc_check [ Check passes because gpc->valid
    is still true, even though gpc->khva is already NULL. ] shinfo = gpc->khva pending_bits =
    shinfo->evtchn_pending CRASH: test_and_set_bit(..., pending_bits) (CVE-2022-49882)

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-2022-49882");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2022-49882");
  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:U/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-2022-49882");

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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/05/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/10");

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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');

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    "package_manager": "dpkg-l",
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        "release": "16.04",
        "pkgs": [
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          {"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"}
        ]
      }
    ]
  },
  "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_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}