Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : LXC vulnerabilities (USN-8826-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8826-1. 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(350932);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/29");

  script_cve_id("CVE-2022-47952", "CVE-2026-39402");
  script_xref(name:"USN", value:"8826-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : LXC vulnerabilities (USN-8826-1)");

  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 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that
are affected by multiple vulnerabilities as referenced in the USN-8826-1 advisory.

    Maher Azzouzi discovered that LXC did not correctly handle logging certain failure messages. An attacker
    could possibly use this issue to leak sensitive information. This issue only affected Ubuntu 16.04 LTS,
    Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2022-47952)

    Sam Sanoop discovered that LXC did not correctly handle certain forms of user authorization. An attacker
    could possibly use this issue to cause a denial of service. (CVE-2026-39402)

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-8826-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:P/I:N/A:N");
  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:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:P");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2022-47952");
  script_set_attribute(attribute:"cvss4_score_source", value:"CVE-2026-39402");

  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:"2023/01/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/28");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/29");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:22.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:liblxc-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:liblxc1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:liblxc1t64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libpam-cgfs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lua-lxc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lxc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lxc-common");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lxc-templates");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lxc-tests");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lxc-utils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:lxc1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:python3-lxc");
  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_info.nasl");
  script_require_keys("Host/cpu", "Host/Ubuntu", "Host/Ubuntu/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.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 (! ('16.04' >< os_release || '18.04' >< os_release || '20.04' >< os_release || '22.04' >< os_release || '24.04' >< os_release || '26.04' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 16.04 / 18.04 / 20.04 / 22.04 / 24.04 / 26.04', '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 pkgs = [
    {'osver': '16.04', 'pkgname': 'liblxc1', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'lua-lxc', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'lxc', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'lxc-common', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'lxc-templates', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'lxc-tests', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'lxc1', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '16.04', 'pkgname': 'python3-lxc', 'pkgver': '2.0.11-0ubuntu1~16.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '18.04', 'pkgname': 'liblxc-common', 'pkgver': '3.0.3-0ubuntu1~18.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '18.04', 'pkgname': 'liblxc1', 'pkgver': '3.0.3-0ubuntu1~18.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '18.04', 'pkgname': 'libpam-cgfs', 'pkgver': '3.0.3-0ubuntu1~18.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '18.04', 'pkgname': 'lxc', 'pkgver': '3.0.3-0ubuntu1~18.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '18.04', 'pkgname': 'lxc-utils', 'pkgver': '3.0.3-0ubuntu1~18.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '18.04', 'pkgname': 'lxc1', 'pkgver': '3.0.3-0ubuntu1~18.04.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '20.04', 'pkgname': 'liblxc-common', 'pkgver': '1:4.0.12-0ubuntu1~20.04.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '20.04', 'pkgname': 'liblxc1', 'pkgver': '1:4.0.12-0ubuntu1~20.04.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '20.04', 'pkgname': 'libpam-cgfs', 'pkgver': '1:4.0.12-0ubuntu1~20.04.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '20.04', 'pkgname': 'lxc', 'pkgver': '1:4.0.12-0ubuntu1~20.04.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '20.04', 'pkgname': 'lxc-utils', 'pkgver': '1:4.0.12-0ubuntu1~20.04.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '20.04', 'pkgname': 'lxc1', 'pkgver': '1:4.0.12-0ubuntu1~20.04.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '22.04', 'pkgname': 'liblxc-common', 'pkgver': '1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '22.04', 'pkgname': 'liblxc1', 'pkgver': '1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '22.04', 'pkgname': 'libpam-cgfs', 'pkgver': '1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '22.04', 'pkgname': 'lxc', 'pkgver': '1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '22.04', 'pkgname': 'lxc-utils', 'pkgver': '1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '22.04', 'pkgname': 'lxc1', 'pkgver': '1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'liblxc-common', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'liblxc1t64', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'libpam-cgfs', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'lxc', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'lxc-tests', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'lxc-utils', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '24.04', 'pkgname': 'lxc1', 'pkgver': '1:5.0.3-2ubuntu7.3+esm1', 'cves': ['CVE-2022-47952', 'CVE-2026-39402']},
    {'osver': '26.04', 'pkgname': 'liblxc-common', 'pkgver': '1:6.0.6-1ubuntu1+esm1', 'cves': ['CVE-2026-39402']},
    {'osver': '26.04', 'pkgname': 'liblxc1t64', 'pkgver': '1:6.0.6-1ubuntu1+esm1', 'cves': ['CVE-2026-39402']},
    {'osver': '26.04', 'pkgname': 'libpam-cgfs', 'pkgver': '1:6.0.6-1ubuntu1+esm1', 'cves': ['CVE-2026-39402']},
    {'osver': '26.04', 'pkgname': 'lxc', 'pkgver': '1:6.0.6-1ubuntu1+esm1', 'cves': ['CVE-2026-39402']},
    {'osver': '26.04', 'pkgname': 'lxc-tests', 'pkgver': '1:6.0.6-1ubuntu1+esm1', 'cves': ['CVE-2026-39402']}
];

var flag = 0;
foreach var package_array ( pkgs ) {
  var osver = NULL;
  var pkgname = NULL;
  var pkgver = NULL;
  if (!empty_or_null(package_array['osver'])) osver = package_array['osver'];
  if (!empty_or_null(package_array['pkgname'])) pkgname = package_array['pkgname'];
  if (!empty_or_null(package_array['pkgver'])) pkgver = package_array['pkgver'];
  if (!empty_or_null(package_array['cves'])) cves = package_array['cves'];
  if (osver && pkgname && pkgver) {
    if (deb_check(release:osver, prefix:pkgname, reference:pkgver, cves:cves)) flag++;
  }
}

if (flag)
{
  var extra = '';
  extra += ubuntu_report_get();
  security_report_v4(
    port       : 0,
    severity   : SECURITY_NOTE,
    extra      : extra
  );
  exit(0);
}
else
{
  var tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'liblxc-common / liblxc1 / liblxc1t64 / libpam-cgfs / lua-lxc / lxc / etc');
}