Ubuntu 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS : GNU C Library vulnerabilities (USN-8737-1)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-8737-1. 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(344610);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/09/10");

  script_cve_id(
    "CVE-2026-6368",
    "CVE-2026-6791",
    "CVE-2026-19499",
    "CVE-2026-19542",
    "CVE-2026-77117",
    "CVE-2026-80489"
  );
  script_xref(name:"IAVA", value:"2026-A-0897");
  script_xref(name:"USN", value:"8737-1");

  script_name(english:"Ubuntu 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS : GNU C Library vulnerabilities (USN-8737-1)");

  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 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS host has packages installed that are affected by
multiple vulnerabilities as referenced in the USN-8737-1 advisory.

    It was discovered that GNU C Library had a buffer overflow in the strfmon function when handling right-
    justification padding. An attacker could possibly use this issue to cause a denial of service or execute
    arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499)

    It was discovered that GNU C Library had an out-of-bounds stack array access in the tdelete function. An
    attacker could possibly use this issue to cause a denial of service or execute arbitrary code.
    (CVE-2026-19542)

    It was discovered that GNU C Library incorrectly handled memory when calling wordexp with the WRDE_APPEND
    flag. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-6368)

    It was discovered that GNU C Library had a stack overflow in the wordexp function when expanding paths
    beginning with a tilde followed by a long username. An attacker could possibly use this issue to cause a
    denial of service or execute arbitrary code. (CVE-2026-6791)

    It was discovered that GNU C Library had a hang in the SHIFT_JISX0213 character set converter. An attacker
    could possibly use this issue to cause a denial of service. (CVE-2026-77117)

    It was discovered that GNU C Library had a hang in the EUC_JISX0213 character set converter. An attacker
    could possibly use this issue to cause a denial of service. (CVE-2026-80489)

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-8737-1");
  script_set_attribute(attribute:"solution", value:
"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:H/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:N/AC:H/PR:N/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:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:L/SA:H");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-6791");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/09/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/09/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  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:26.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:Pro:-:lts");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:glibc-source");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc-dev-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc-devtools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc-gconv-modules-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-amd64");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-s390");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-dev-x32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-i386");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-prof");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-s390");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libc6-x32");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:locales");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:locales-all");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:nscd");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  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 (! ('22.04' >< os_release || '26.04' >< os_release || 'Pro' >< os_release)) audit(AUDIT_OS_NOT, 'Ubuntu 22.04 / 26.04 / Pro', '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': '22.04', 'pkgname': 'glibc-source', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc-bin', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc-devtools', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-dev-s390', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-i386', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-prof', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-s390', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'libc6-x32', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'locales', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'locales-all', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '22.04', 'pkgname': 'nscd', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'glibc-source', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc-bin', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc-dev-bin', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc-devtools', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc-gconv-modules-extra', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6-amd64', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6-i386', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'libc6-x32', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'locales', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'locales-all', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': '26.04', 'pkgname': 'nscd', 'pkgver': '2.43-2ubuntu2.4', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19499', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'glibc-source', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc-bin', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc-dev-bin', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc-devtools', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-amd64', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-dev-amd64', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-dev-i386', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-dev-s390', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-dev-x32', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-i386', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-prof', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-s390', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'libc6-x32', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'locales', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'locales-all', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']},
    {'osver': 'Pro', 'pkgname': 'nscd', 'pkgver': '2.35-0ubuntu3.15', 'cves': ['CVE-2026-6368', 'CVE-2026-6791', 'CVE-2026-19542', 'CVE-2026-77117', 'CVE-2026-80489']}
];

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_WARNING,
    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, 'glibc-source / libc-bin / libc-dev-bin / libc-devtools / etc');
}