Linux Distros Unpatched Vulnerability : CVE-2026-48979

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

include('compat.inc');

if (description)
{
  script_id(321780);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/20");

  script_cve_id("CVE-2026-48979");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-48979");

  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.

  - PHP Standard Library (PSL) is set of APIs covering async, collections, networking, I/O, cryptography,
    terminal UI, etc. In versions 6.1.0, 6.1.1 and 6.2.0, the Psl\H2\ServerConnection does not validate that
    the total bytes received in DATA frames match the content-length header declared in the HEADERS frame,
    allowing request smuggling. This is in violation of RFC 9113 8.1.1. A malicious client is able to send
    more DATA bytes than declared, smuggling additional content past application-level size limits and send
    fewer DATA bytes than declared and close the stream early, causing applications that trust the declared
    length to behave incorrectly. The vulnerability is only reachable for consumers using
    Psl\H2\ServerConnection directly to accept untrusted client traffic. Consumers of documented high-level
    PSL APIs are not affected. This issue has been fixed in versions 6.1.2 and 6.2.1. (CVE-2026-48979)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2026-48979");
  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:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-48979");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/06/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/20");

  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:"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:25.10");
  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:php5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php7.0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php7.2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php7.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php8.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php8.3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php8.4");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:php8.5");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
  script_require_keys("Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched", "Host/OS/identifier");
  script_require_ports("Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-22.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.10", "Host/OS/Ubuntu Linux-26.04");

  exit(0);
}

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"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "libapache2-mod-php5"},
          {"reference": "libapache2-mod-php5filter"},
          {"reference": "libphp5-embed"},
          {"reference": "php-pear"},
          {"reference": "php5"},
          {"reference": "php5-cgi"},
          {"reference": "php5-cli"},
          {"reference": "php5-common"},
          {"reference": "php5-curl"},
          {"reference": "php5-dbg"},
          {"reference": "php5-dev"},
          {"reference": "php5-enchant"},
          {"reference": "php5-fpm"},
          {"reference": "php5-gd"},
          {"reference": "php5-gmp"},
          {"reference": "php5-intl"},
          {"reference": "php5-ldap"},
          {"reference": "php5-mysql"},
          {"reference": "php5-mysqlnd"},
          {"reference": "php5-odbc"},
          {"reference": "php5-pgsql"},
          {"reference": "php5-pspell"},
          {"reference": "php5-readline"},
          {"reference": "php5-recode"},
          {"reference": "php5-snmp"},
          {"reference": "php5-sqlite"},
          {"reference": "php5-sybase"},
          {"reference": "php5-tidy"},
          {"reference": "php5-xmlrpc"},
          {"reference": "php5-xsl"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "libapache2-mod-php7.0"},
          {"reference": "libphp7.0-embed"},
          {"reference": "php7.0"},
          {"reference": "php7.0-bcmath"},
          {"reference": "php7.0-bz2"},
          {"reference": "php7.0-cgi"},
          {"reference": "php7.0-cli"},
          {"reference": "php7.0-common"},
          {"reference": "php7.0-curl"},
          {"reference": "php7.0-dev"},
          {"reference": "php7.0-enchant"},
          {"reference": "php7.0-fpm"},
          {"reference": "php7.0-gd"},
          {"reference": "php7.0-gmp"},
          {"reference": "php7.0-imap"},
          {"reference": "php7.0-interbase"},
          {"reference": "php7.0-intl"},
          {"reference": "php7.0-json"},
          {"reference": "php7.0-ldap"},
          {"reference": "php7.0-mbstring"},
          {"reference": "php7.0-mcrypt"},
          {"reference": "php7.0-mysql"},
          {"reference": "php7.0-odbc"},
          {"reference": "php7.0-opcache"},
          {"reference": "php7.0-pgsql"},
          {"reference": "php7.0-phpdbg"},
          {"reference": "php7.0-pspell"},
          {"reference": "php7.0-readline"},
          {"reference": "php7.0-recode"},
          {"reference": "php7.0-snmp"},
          {"reference": "php7.0-soap"},
          {"reference": "php7.0-sqlite3"},
          {"reference": "php7.0-sybase"},
          {"reference": "php7.0-tidy"},
          {"reference": "php7.0-xml"},
          {"reference": "php7.0-xmlrpc"},
          {"reference": "php7.0-xsl"},
          {"reference": "php7.0-zip"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "libapache2-mod-php7.2"},
          {"reference": "libphp7.2-embed"},
          {"reference": "php7.2"},
          {"reference": "php7.2-bcmath"},
          {"reference": "php7.2-bz2"},
          {"reference": "php7.2-cgi"},
          {"reference": "php7.2-cli"},
          {"reference": "php7.2-common"},
          {"reference": "php7.2-curl"},
          {"reference": "php7.2-dba"},
          {"reference": "php7.2-dev"},
          {"reference": "php7.2-enchant"},
          {"reference": "php7.2-fpm"},
          {"reference": "php7.2-gd"},
          {"reference": "php7.2-gmp"},
          {"reference": "php7.2-imap"},
          {"reference": "php7.2-interbase"},
          {"reference": "php7.2-intl"},
          {"reference": "php7.2-json"},
          {"reference": "php7.2-ldap"},
          {"reference": "php7.2-mbstring"},
          {"reference": "php7.2-mysql"},
          {"reference": "php7.2-odbc"},
          {"reference": "php7.2-opcache"},
          {"reference": "php7.2-pgsql"},
          {"reference": "php7.2-phpdbg"},
          {"reference": "php7.2-pspell"},
          {"reference": "php7.2-readline"},
          {"reference": "php7.2-recode"},
          {"reference": "php7.2-snmp"},
          {"reference": "php7.2-soap"},
          {"reference": "php7.2-sqlite3"},
          {"reference": "php7.2-sybase"},
          {"reference": "php7.2-tidy"},
          {"reference": "php7.2-xml"},
          {"reference": "php7.2-xmlrpc"},
          {"reference": "php7.2-xsl"},
          {"reference": "php7.2-zip"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "libapache2-mod-php7.4"},
          {"reference": "libphp7.4-embed"},
          {"reference": "php7.4"},
          {"reference": "php7.4-bcmath"},
          {"reference": "php7.4-bz2"},
          {"reference": "php7.4-cgi"},
          {"reference": "php7.4-cli"},
          {"reference": "php7.4-common"},
          {"reference": "php7.4-curl"},
          {"reference": "php7.4-dba"},
          {"reference": "php7.4-dev"},
          {"reference": "php7.4-enchant"},
          {"reference": "php7.4-fpm"},
          {"reference": "php7.4-gd"},
          {"reference": "php7.4-gmp"},
          {"reference": "php7.4-imap"},
          {"reference": "php7.4-interbase"},
          {"reference": "php7.4-intl"},
          {"reference": "php7.4-json"},
          {"reference": "php7.4-ldap"},
          {"reference": "php7.4-mbstring"},
          {"reference": "php7.4-mysql"},
          {"reference": "php7.4-odbc"},
          {"reference": "php7.4-opcache"},
          {"reference": "php7.4-pgsql"},
          {"reference": "php7.4-phpdbg"},
          {"reference": "php7.4-pspell"},
          {"reference": "php7.4-readline"},
          {"reference": "php7.4-snmp"},
          {"reference": "php7.4-soap"},
          {"reference": "php7.4-sqlite3"},
          {"reference": "php7.4-sybase"},
          {"reference": "php7.4-tidy"},
          {"reference": "php7.4-xml"},
          {"reference": "php7.4-xmlrpc"},
          {"reference": "php7.4-xsl"},
          {"reference": "php7.4-zip"}
        ]
      }
    ]
  },
  "Ubuntu Linux-22.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "22.04",
        "pkgs": [
          {"reference": "libapache2-mod-php7.4"},
          {"reference": "libapache2-mod-php8.0"},
          {"reference": "libapache2-mod-php8.1"},
          {"reference": "libphp8.1-embed"},
          {"reference": "php8.1"},
          {"reference": "php8.1-bcmath"},
          {"reference": "php8.1-bz2"},
          {"reference": "php8.1-cgi"},
          {"reference": "php8.1-cli"},
          {"reference": "php8.1-common"},
          {"reference": "php8.1-curl"},
          {"reference": "php8.1-dba"},
          {"reference": "php8.1-dev"},
          {"reference": "php8.1-enchant"},
          {"reference": "php8.1-fpm"},
          {"reference": "php8.1-gd"},
          {"reference": "php8.1-gmp"},
          {"reference": "php8.1-imap"},
          {"reference": "php8.1-interbase"},
          {"reference": "php8.1-intl"},
          {"reference": "php8.1-ldap"},
          {"reference": "php8.1-mbstring"},
          {"reference": "php8.1-mysql"},
          {"reference": "php8.1-odbc"},
          {"reference": "php8.1-opcache"},
          {"reference": "php8.1-pgsql"},
          {"reference": "php8.1-phpdbg"},
          {"reference": "php8.1-pspell"},
          {"reference": "php8.1-readline"},
          {"reference": "php8.1-snmp"},
          {"reference": "php8.1-soap"},
          {"reference": "php8.1-sqlite3"},
          {"reference": "php8.1-sybase"},
          {"reference": "php8.1-tidy"},
          {"reference": "php8.1-xml"},
          {"reference": "php8.1-xsl"},
          {"reference": "php8.1-zip"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "libapache2-mod-php8.3"},
          {"reference": "libphp8.3-embed"},
          {"reference": "php8.3"},
          {"reference": "php8.3-bcmath"},
          {"reference": "php8.3-bz2"},
          {"reference": "php8.3-cgi"},
          {"reference": "php8.3-cli"},
          {"reference": "php8.3-common"},
          {"reference": "php8.3-curl"},
          {"reference": "php8.3-dba"},
          {"reference": "php8.3-dev"},
          {"reference": "php8.3-enchant"},
          {"reference": "php8.3-fpm"},
          {"reference": "php8.3-gd"},
          {"reference": "php8.3-gmp"},
          {"reference": "php8.3-imap"},
          {"reference": "php8.3-interbase"},
          {"reference": "php8.3-intl"},
          {"reference": "php8.3-ldap"},
          {"reference": "php8.3-mbstring"},
          {"reference": "php8.3-mysql"},
          {"reference": "php8.3-odbc"},
          {"reference": "php8.3-opcache"},
          {"reference": "php8.3-pgsql"},
          {"reference": "php8.3-phpdbg"},
          {"reference": "php8.3-pspell"},
          {"reference": "php8.3-readline"},
          {"reference": "php8.3-snmp"},
          {"reference": "php8.3-soap"},
          {"reference": "php8.3-sqlite3"},
          {"reference": "php8.3-sybase"},
          {"reference": "php8.3-tidy"},
          {"reference": "php8.3-xml"},
          {"reference": "php8.3-xsl"},
          {"reference": "php8.3-zip"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "libapache2-mod-php8.4"},
          {"reference": "libphp8.4-embed"},
          {"reference": "php8.4"},
          {"reference": "php8.4-bcmath"},
          {"reference": "php8.4-bz2"},
          {"reference": "php8.4-cgi"},
          {"reference": "php8.4-cli"},
          {"reference": "php8.4-common"},
          {"reference": "php8.4-curl"},
          {"reference": "php8.4-dba"},
          {"reference": "php8.4-dev"},
          {"reference": "php8.4-enchant"},
          {"reference": "php8.4-fpm"},
          {"reference": "php8.4-gd"},
          {"reference": "php8.4-gmp"},
          {"reference": "php8.4-interbase"},
          {"reference": "php8.4-intl"},
          {"reference": "php8.4-ldap"},
          {"reference": "php8.4-mbstring"},
          {"reference": "php8.4-mysql"},
          {"reference": "php8.4-odbc"},
          {"reference": "php8.4-opcache"},
          {"reference": "php8.4-pgsql"},
          {"reference": "php8.4-phpdbg"},
          {"reference": "php8.4-readline"},
          {"reference": "php8.4-snmp"},
          {"reference": "php8.4-soap"},
          {"reference": "php8.4-sqlite3"},
          {"reference": "php8.4-sybase"},
          {"reference": "php8.4-tidy"},
          {"reference": "php8.4-xml"},
          {"reference": "php8.4-xsl"},
          {"reference": "php8.4-zip"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "libapache2-mod-php8.5"},
          {"reference": "libphp8.5-embed"},
          {"reference": "php8.5"},
          {"reference": "php8.5-bcmath"},
          {"reference": "php8.5-bz2"},
          {"reference": "php8.5-cgi"},
          {"reference": "php8.5-cli"},
          {"reference": "php8.5-common"},
          {"reference": "php8.5-curl"},
          {"reference": "php8.5-dba"},
          {"reference": "php8.5-dev"},
          {"reference": "php8.5-enchant"},
          {"reference": "php8.5-fpm"},
          {"reference": "php8.5-gd"},
          {"reference": "php8.5-gmp"},
          {"reference": "php8.5-interbase"},
          {"reference": "php8.5-intl"},
          {"reference": "php8.5-ldap"},
          {"reference": "php8.5-litespeed"},
          {"reference": "php8.5-mbstring"},
          {"reference": "php8.5-mysql"},
          {"reference": "php8.5-odbc"},
          {"reference": "php8.5-pgsql"},
          {"reference": "php8.5-phpdbg"},
          {"reference": "php8.5-readline"},
          {"reference": "php8.5-snmp"},
          {"reference": "php8.5-soap"},
          {"reference": "php8.5-sqlite3"},
          {"reference": "php8.5-sybase"},
          {"reference": "php8.5-tidy"},
          {"reference": "php8.5-xml"},
          {"reference": "php8.5-xsl"},
          {"reference": "php8.5-zip"}
        ]
      }
    ]
  }
};

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');
}