Linux Distros Unpatched Vulnerability : CVE-2025-37814

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

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  script_id(248381);
  script_version("1.10");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/22");

  script_cve_id("CVE-2025-37814");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-37814");

  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: tty: Require CAP_SYS_ADMIN for all
    usages of TIOCL_SELMOUSEREPORT This requirement was overeagerly loosened in commit 2f83e38a095f (tty:
    Permit some TIOCL_SETSEL modes without CAP_SYS_ADMIN), but as it turns out, (1) the logic I implemented
    there was inconsistent (apologies!), (2) TIOCL_SELMOUSEREPORT might actually be a small security risk
    after all, and (3) TIOCL_SELMOUSEREPORT is only meant to be used by the mouse daemon (GPM or Consolation),
    which runs as CAP_SYS_ADMIN already. In more detail: 1. The previous patch has inconsistent logic: In
    commit 2f83e38a095f (tty: Permit some TIOCL_SETSEL modes without CAP_SYS_ADMIN), we checked for sel_mode
    == TIOCL_SELMOUSEREPORT, but overlooked that the lower four bits of this mode parameter were actually
    used as an additional way to pass an argument. So the patch did actually still require CAP_SYS_ADMIN, if
    any of the mouse button bits are set, but did not require it if none of the mouse buttons bits are set.
    This logic is inconsistent and was not intentional. We should have the same policies for using
    TIOCL_SELMOUSEREPORT independent of the value of the hidden mouse button argument. I sent a separate
    documentation patch to the man page list with more details on TIOCL_SELMOUSEREPORT:
    https://lore.kernel.org/all/[email protected]/ 2. TIOCL_SELMOUSEREPORT is indeed
    a potential security risk which can let an attacker simulate keyboard input to command line applications
    on the same terminal, like TIOCSTI and some other TIOCLINUX selection mode IOCTLs. By enabling mouse
    reporting on a terminal and then injecting mouse reports through TIOCL_SELMOUSEREPORT, an attacker can
    simulate mouse movements on the same terminal, similar to the TIOCSTI keystroke injection attacks that
    were previously possible with TIOCSTI and other TIOCL_SETSEL selection modes. Many programs (including
    libreadline/bash) are then prone to misinterpret these mouse reports as normal keyboard input because they
    do not expect input in the X11 mouse protocol form. The attacker does not have complete control over the
    escape sequence, but they can at least control the values of two consecutive bytes in the binary mouse
    reporting escape sequence. I went into more detail on that in the discussion at
    https://lore.kernel.org/all/[email protected]/ It is not equally trivial to simulate
    arbitrary keystrokes as it was with TIOCSTI (commit 83efeeeb3d04 (tty: Allow TIOCSTI to be disabled)),
    but the general mechanism is there, and together with the small number of existing legit use cases (see
    below), it would be better to revert back to requiring CAP_SYS_ADMIN for TIOCL_SELMOUSEREPORT, as it was
    already the case before commit 2f83e38a095f (tty: Permit some TIOCL_SETSEL modes without CAP_SYS_ADMIN).
    3. TIOCL_SELMOUSEREPORT is only used by the mouse daemons (GPM or Consolation), and they are the only
    legit use case: To quote console_codes(4): The mouse tracking facility is intended to return
    xterm(1)-compatible mouse status reports. Because the console driver has no way to know the device or type
    of the mouse, these reports are returned in the console input stream only when the virtual terminal driver
    receives a mouse update ioctl. These ioctls must be generated by a mouse-aware user-mode application such
    as the gpm(8) daemon. Jared Finder has also confirmed in
    https://lore.kernel.org/all/[email protected]/ that Emacs does not call
    TIOCL_SELMOUSEREPORT directly, and it would be difficult to find good reasons for doing that, given that
    it would interfere with the reports that GPM is sending. More information on the interaction between GPM,
    terminals and th ---truncated--- (CVE-2025-37814)

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-2025-37814");
  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:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-37814");

  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:"2025/05/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/11");

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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"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

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    "package_manager": "dpkg-l",
    "constraints": [
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        "release": "16.04",
        "pkgs": [
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  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "linux-azure-fde"}
        ]
      }
    ]
  }
};

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');
}