Linux Distros Unpatched Vulnerability : CVE-2025-21977

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

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if (description)
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  script_id(244428);
  script_version("1.13");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/30");

  script_cve_id("CVE-2025-21977");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-21977");

  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: fbdev: hyperv_fb: Fix hang in kdump
    kernel when on Hyper-V Gen 2 VMs Gen 2 Hyper-V VMs boot via EFI and have a standard EFI framebuffer
    device. When the kdump kernel runs in such a VM, loading the efifb driver may hang because of accessing
    the framebuffer at the wrong memory address. The scenario occurs when the hyperv_fb driver in the original
    kernel moves the framebuffer to a different MMIO address because of conflicts with an already-running
    efifb or simplefb driver. The hyperv_fb driver then informs Hyper-V of the change, which is allowed by the
    Hyper-V FB VMBus device protocol. However, when the kexec command loads the kdump kernel into crash memory
    via the kexec_file_load() system call, the system call doesn't know the framebuffer has moved, and it sets
    up the kdump screen_info using the original framebuffer address. The transition to the kdump kernel does
    not go through the Hyper-V host, so Hyper-V does not reset the framebuffer address like it would do on a
    reboot. When efifb tries to run, it accesses a non-existent framebuffer address, which traps to the
    Hyper-V host. After many such accesses, the Hyper-V host thinks the guest is being malicious, and
    throttles the guest to the point that it runs very slowly or appears to have hung. When the kdump kernel
    is loaded into crash memory via the kexec_load() system call, the problem does not occur. In this case,
    the kexec command builds the screen_info table itself in user space from data returned by the
    FBIOGET_FSCREENINFO ioctl against /dev/fb0, which gives it the new framebuffer location. This problem was
    originally reported in 2020 [1], resulting in commit 3cb73bc3fa2a (hyperv_fb: Update screen_info after
    removing old framebuffer). This commit solved the problem by setting orig_video_isVGA to 0, so the kdump
    kernel was unaware of the EFI framebuffer. The efifb driver did not try to load, and no hang occurred. But
    in 2024, commit c25a19afb81c (fbdev/hyperv_fb: Do not clear global screen_info) effectively reverted
    3cb73bc3fa2a. Commit c25a19afb81c has no reference to 3cb73bc3fa2a, so perhaps it was done without knowing
    the implications that were reported with 3cb73bc3fa2a. In any case, as of commit c25a19afb81c, the
    original problem came back again. Interestingly, the hyperv_drm driver does not have this problem because
    it never moves the framebuffer. The difference is that the hyperv_drm driver removes any conflicting
    framebuffers *before* allocating an MMIO address, while the hyperv_fb drivers removes conflicting
    framebuffers *after* allocating an MMIO address. With the after ordering, hyperv_fb may encounter a
    conflict and move the framebuffer to a different MMIO address. But the conflict is essentially bogus
    because it is removed a few lines of code later. Rather than fix the problem with the approach from 2020
    in commit 3cb73bc3fa2a, instead slightly reorder the steps in hyperv_fb so conflicting framebuffers are
    removed before allocating an MMIO address. Then the default framebuffer MMIO address should always be
    available, and there's never any confusion about which framebuffer address the kdump kernel should use --
    it's always the original address provided by the Hyper-V host. This approach is already used by the
    hyperv_drm driver, and is consistent with the usage guidelines at the head of the module with the function
    aperture_remove_conflicting_devices(). This approach also solves a related minor problem when kexec_load()
    is used to load the kdump kernel. With current code, unbinding and rebinding the hyperv_fb driver could
    result in the framebuffer moving back to the default framebuffer address, because on the rebind there are
    no conflicts. If such a move is done after the kdump kernel is loaded with the new framebuffer address, at
    kdump time it could again have the wrong address. This problem and fix are described in terms of the kdump
    kernel, but it can also occur ---truncated--- (CVE-2025-21977)

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-2025-21977");
  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:L/Au:N/C:N/I:N/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-2025-21977");

  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:"2025/04/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/06");

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

  script_copyright(english:"This script is Copyright (C) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl", "set_linux_os_id.nasl");
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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');

var distro_constraints_array = {
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "linux-aws-5.0"},
          {"reference": "linux-aws-5.3"},
          {"reference": "linux-azure-5.3"},
          {"reference": "linux-azure-cloud-tools-4.15.0"},
          {"reference": "linux-azure-edge"},
          {"reference": "linux-azure-headers-4.15.0"},
          {"reference": "linux-azure-tools-4.15.0"},
          {"reference": "linux-cloud-tools-4.15.0"},
          {"reference": "linux-gcp-5.3"},
          {"reference": "linux-gcp-headers-4.15.0"},
          {"reference": "linux-gcp-tools-4.15.0"},
          {"reference": "linux-gke-4.15"},
          {"reference": "linux-gke-5.4"},
          {"reference": "linux-gkeop-5.4"},
          {"reference": "linux-headers-4.15.0"},
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          {"reference": "linux-hwe-edge"},
          {"reference": "linux-image-4.15.0"},
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    "constraints": [
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        "release": "20.04",
        "pkgs": [
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    "constraints": [
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          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "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');
}