Linux Distros Unpatched Vulnerability : CVE-2022-50014

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

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  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/30");

  script_cve_id("CVE-2022-50014");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2022-50014");

  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: mm/gup: fix FOLL_FORCE COW security
    issue and remove FOLL_COW Ever since the Dirty COW (CVE-2016-5195) security issue happened, we know that
    FOLL_FORCE can be possibly dangerous, especially if there are races that can be exploited by user space.
    Right now, it would be sufficient to have some code that sets a PTE of a R/O-mapped shared page dirty, in
    order for it to erroneously become writable by FOLL_FORCE. The implications of setting a write-protected
    PTE dirty might not be immediately obvious to everyone. And in fact ever since commit 9ae0f87d009c
    (mm/shmem: unconditionally set pte dirty in mfill_atomic_install_pte), we can use UFFDIO_CONTINUE to map
    a shmem page R/O while marking the pte dirty. This can be used by unprivileged user space to modify
    tmpfs/shmem file content even if the user does not have write permissions to the file, and to bypass memfd
    write sealing -- Dirty COW restricted to tmpfs/shmem (CVE-2022-2590). To fix such security issues for
    good, the insight is that we really only need that fancy retry logic (FOLL_COW) for COW mappings that are
    not writable (!VM_WRITE). And in a COW mapping, we really only broke COW if we have an exclusive anonymous
    page mapped. If we have something else mapped, or the mapped anonymous page might be shared
    (!PageAnonExclusive), we have to trigger a write fault to break COW. If we don't find an exclusive
    anonymous page when we retry, we have to trigger COW breaking once again because something intervened.
    Let's move away from this mandatory-retry + dirty handling and rely on our PageAnonExclusive() flag for
    making a similar decision, to use the same COW logic as in other kernel parts here as well. In case we
    stumble over a PTE in a COW mapping that does not map an exclusive anonymous page, COW was not properly
    broken and we have to trigger a fake write-fault to break COW. Just like we do in
    can_change_pte_writable() added via commit 64fe24a3e05e (mm/mprotect: try avoiding write faults for
    exclusive anonymous pages when changing protection) and commit 76aefad628aa (mm/mprotect: fix soft-dirty
    check in can_change_pte_writable()), take care of softdirty and uffd-wp manually. For example, a write()
    via /proc/self/mem to a uffd-wp-protected range has to fail instead of silently granting write access and
    bypassing the userspace fault handler. Note that FOLL_FORCE is not only used for debug access, but also
    triggered by applications without debug intentions, for example, when pinning pages via RDMA. This fixes
    CVE-2022-2590. Note that only x86_64 and aarch64 are affected, because only those support
    CONFIG_HAVE_ARCH_USERFAULTFD_MINOR. Fortunately, FOLL_COW is no longer required to handle FOLL_FORCE. So
    let's just get rid of it. Thanks to Nadav Amit for pointing out that the pte_dirty() check in FOLL_FORCE
    code is problematic and might be exploitable. Note 1: We don't check for the PTE being dirty because it
    doesn't matter for making a was COWed decision anymore, and whoever modifies the page has to set the
    page dirty either way. Note 2: Kernels before extended uffd-wp support and before PageAnonExclusive (<
    5.19) can simply revert the problematic commit instead and be safe regarding UFFDIO_CONTINUE. A backport
    to v5.19 requires minor adjustments due to lack of vma_soft_dirty_enabled(). (CVE-2022-50014)

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-2022-50014");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2022-50014");
  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:P/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:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/18");
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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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          {"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-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-iwlwifi-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"}
        ]
      }
    ]
  },
  "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');
}