Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-8924-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8924-1. The text
# itself is copyright (C) Canonical, Inc. See
# <https://ubuntu.com/security/notices>. Ubuntu(R) is a registered
# trademark of Canonical, Inc.
##

include('compat.inc');

if (description)
{
  script_id(365631);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/14");

  script_cve_id(
    "CVE-2017-5967",
    "CVE-2018-5848",
    "CVE-2018-13093",
    "CVE-2018-13097",
    "CVE-2018-13100",
    "CVE-2021-3752",
    "CVE-2021-4083",
    "CVE-2021-39634",
    "CVE-2022-24448",
    "CVE-2026-53131"
  );
  script_xref(name:"USN", value:"8924-1");

  script_name(english:"Ubuntu 14.04 LTS : Linux kernel vulnerabilities (USN-8924-1)");

  script_set_attribute(attribute:"synopsis", value:
"The remote Ubuntu host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The remote Ubuntu 14.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in
the USN-8924-1 advisory.

    It was discovered that the timer stats implementation in the Linux kernel allowed the discovery of a real
    PID value while inside a PID namespace. A local attacker could use this to expose sensitive information.
    (CVE-2017-5967)

    Wen Xu discovered that the XFS file system implementation in the Linux kernel did not properly track inode
    validations. An attacker could use this to construct a malicious XFS image that, when mounted, could cause
    a denial of service (system crash). (CVE-2018-13093)

    Wen Xu discovered that the f2fs file system implementation in the Linux kernel did not properly validate
    metadata. An attacker could use this to construct a malicious f2fs image that, when mounted, could cause a
    denial of service (system crash). (CVE-2018-13097, CVE-2018-13100)

    It was discovered that the Qualcomm Atheros 60GHz wireless driver in the Linux kernel contained an integer
    overflow when validating the length of certain information elements, leading to a buffer overflow. A local
    attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
    (CVE-2018-5848)

    Likang Luo discovered that a race condition existed in the Bluetooth subsystem of the Linux kernel,
    leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2021-3752)

    It was discovered that the eventpoll (aka epoll) implementation in the Linux kernel did not properly
    handle certain error conditions when adding file descriptors, leading to a use-after-free vulnerability. A
    local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2021-39634)

    Jann Horn discovered a race condition in the Unix domain socket implementation in the Linux kernel that
    could result in a read-after-free. A local attacker could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2021-4083)

    Lyu Tao discovered that the NFS implementation in the Linux kernel did not properly handle requests to
    open a directory on a regular file. A local attacker could use this to expose sensitive information
    (kernel memory). (CVE-2022-24448)

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to
    compromise the system. This update corrects flaws in the following subsystems:

    - IPv6 networking;

    - Netfilter; (CVE-2026-53131)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/notices/USN-8924-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  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:POC/RL:OF/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3752");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-39634");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2017/02/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/14");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-218-generic");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:linux-image-3.13.0-218-lowlatency");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Ubuntu Local Security Checks");

  script_copyright(english:"Ubuntu Security Notice (C) 2026 Canonical, Inc. / NASL script (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "linux_alt_patch_detect.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');
include('ksplice.inc');

if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_release = get_kb_item('Host/Ubuntu/release');
if ( isnull(os_release) ) audit(AUDIT_OS_NOT, 'Ubuntu');
os_release = chomp(os_release);
if (! ('14.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 14.04', 'Ubuntu ' + os_release);
if ( ! get_kb_item('Host/Debian/dpkg-l') ) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 's390' >!< cpu && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Ubuntu', cpu);

var kernel_mappings = {
  '14.04': {
    '3.13.0': {
      'generic': '3.13.0-218',
      'lowlatency': '3.13.0-218'
    }
  }
};

var host_kernel_release = get_kb_item('Host/uptrack-uname-r');
if (empty_or_null(host_kernel_release)) host_kernel_release = get_kb_item_or_exit('Host/uname-r');
var host_kernel_base_version = get_kb_item_or_exit('Host/Debian/kernel-base-version');
var host_kernel_type = get_kb_item_or_exit('Host/Debian/kernel-type');
if(empty_or_null(kernel_mappings[os_release][host_kernel_base_version][host_kernel_type])) audit(AUDIT_INST_VER_NOT_VULN, 'kernel ' + host_kernel_release);

var extra = '';
var kernel_fixed_version = kernel_mappings[os_release][host_kernel_base_version][host_kernel_type] + "-" + host_kernel_type;
if (deb_ver_cmp(ver1:host_kernel_release, ver2:kernel_fixed_version) < 0)
{
  extra += 'Running Kernel level of ' + host_kernel_release + ' does not meet the minimum fixed level of ' + kernel_fixed_version + ' for this advisory.\n\n';
}
  else
{
  audit(AUDIT_PATCH_INSTALLED, 'Kernel package for USN-8924-1');
}

if (get_one_kb_item('Host/ksplice/kernel-cves'))
{
  var cve_list = make_list('CVE-2017-5967', 'CVE-2018-5848', 'CVE-2018-13093', 'CVE-2018-13097', 'CVE-2018-13100', 'CVE-2021-3752', 'CVE-2021-4083', 'CVE-2021-39634', 'CVE-2022-24448', 'CVE-2026-53131');
  if (ksplice_cves_check(cve_list))
  {
    audit(AUDIT_PATCH_INSTALLED, 'KSplice hotfix for USN-8924-1');
  }
  else
  {
    extra = extra + ksplice_reporting_text();
  }
}
if (extra) {
  security_report_v4(
    port       : 0,
    severity   : SECURITY_HOLE,
    extra      : extra
  );
  exit(0);
}