Linux Distros Unpatched Vulnerability : CVE-2026-43188

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

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if (description)
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  script_id(313158);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/29");

  script_cve_id("CVE-2026-43188");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-43188");

  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.

  - ceph: do not propagate page array emplacement errors as batch errors When fscrypt is enabled,
    move_dirty_folio_in_page_array() may fail because it needs to allocate bounce buffers to store the
    encrypted versions of each folio. Each folio beyond the first allocates its bounce buffer with GFP_NOWAIT.
    Failures are common (and expected) under this allocation mode; they should flush (not abort) the batch.
    However, ceph_process_folio_batch() uses the same `rc` variable for its own return code and for capturing
    the return codes of its routine calls; failing to reset `rc` back to 0 results in the error being
    propagated out to the main writeback loop, which cannot actually tolerate any errors here: once
    `ceph_wbc.pages` is allocated, it must be passed to ceph_submit_write() to be freed. If it survives until
    the next iteration (e.g. due to the goto being followed), ceph_allocate_page_array()'s BUG_ON() will oops
    the worker. Note that this failure mode is currently masked due to another bug (addressed next in this
    series) that prevents multiple encrypted folios from being selected for the same write. For now, just
    reset `rc` when redirtying the folio to prevent errors in move_dirty_folio_in_page_array() from
    propagating. Note that move_dirty_folio_in_page_array() is careful never to return errors on the first
    folio, so there is no need to check for that. After this change, ceph_process_folio_batch() no longer
    returns errors; its only remaining failure indicator is `locked_pages == 0`, which the caller already
    handles correctly. (CVE-2026-43188)

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-2026-43188");
  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-2026-43188");

  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:"2026/05/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/05/07");

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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 = {
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    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-hwe-edge"}
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          {"reference": "linux-azure-cloud-tools-4.15.0"},
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          {"reference": "linux-aws-6.17"},
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-6.17"},
          {"reference": "linux-azure-fde-6.17"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-gcp-6.14"},
          {"reference": "linux-gcp-6.17"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-hwe-6.14"},
          {"reference": "linux-hwe-6.17"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-extra-6.8.0"},
          {"reference": "linux-modules-ipu6-6.8.0"},
          {"reference": "linux-modules-iwlwifi-6.8.0"},
          {"reference": "linux-nvidia-6.11"},
          {"reference": "linux-nvidia-6.17"},
          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.14"},
          {"reference": "linux-oem-6.17"},
          {"reference": "linux-oem-6.8-headers-6.8.0"},
          {"reference": "linux-oem-6.8-lib-rust-6.8.0"},
          {"reference": "linux-oem-6.8-tools-6.8.0"},
          {"reference": "linux-oracle-6.14"},
          {"reference": "linux-oracle-6.17"},
          {"reference": "linux-raspi-realtime"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-6.14"},
          {"reference": "linux-riscv-6.17"},
          {"reference": "linux-riscv-headers-6.8.0"},
          {"reference": "linux-riscv-tools-6.8.0"},
          {"reference": "linux-tools-6.8.0"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "bpftool"},
          {"reference": "linux-aws-cloud-tools-6.17.0"},
          {"reference": "linux-aws-headers-6.17.0"},
          {"reference": "linux-aws-tools-6.17.0"},
          {"reference": "linux-azure-cloud-tools-6.17.0"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-headers-6.17.0"},
          {"reference": "linux-azure-tools-6.17.0"},
          {"reference": "linux-bpf-dev"},
          {"reference": "linux-buildinfo-6.17.0"},
          {"reference": "linux-cloud-tools-6.17.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-gcp-headers-6.17.0"},
          {"reference": "linux-gcp-tools-6.17.0"},
          {"reference": "linux-headers-6.17.0"},
          {"reference": "linux-image-6.17.0"},
          {"reference": "linux-image-unsigned-6.17.0"},
          {"reference": "linux-lib-rust-6.17.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-modules-6.17.0"},
          {"reference": "linux-modules-extra-6.17.0"},
          {"reference": "linux-modules-ipu6-6.17.0"},
          {"reference": "linux-modules-ipu7-6.17.0"},
          {"reference": "linux-modules-iwlwifi-6.17.0"},
          {"reference": "linux-modules-usbio-6.17.0"},
          {"reference": "linux-modules-vision-6.17.0"},
          {"reference": "linux-oracle-headers-6.17.0"},
          {"reference": "linux-oracle-tools-6.17.0"},
          {"reference": "linux-perf"},
          {"reference": "linux-raspi-headers-6.17.0"},
          {"reference": "linux-raspi-tools-6.17.0"},
          {"reference": "linux-realtime"},
          {"reference": "linux-riscv-headers-6.17.0"},
          {"reference": "linux-riscv-tools-6.17.0"},
          {"reference": "linux-source-6.17.0"},
          {"reference": "linux-tools-6.17.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-tools-host"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-aws-64k"},
          {"reference": "linux-udebs-azure"}
        ]
      }
    ]
  },
  "Ubuntu Linux-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "linux-azure-fde-cloud-tools-7.0.0"},
          {"reference": "linux-azure-fde-headers-7.0.0"},
          {"reference": "linux-azure-fde-tools-7.0.0"},
          {"reference": "linux-buildinfo-7.0.0"},
          {"reference": "linux-cloud-tools-7.0.0"},
          {"reference": "linux-headers-7.0.0"},
          {"reference": "linux-image-unsigned-7.0.0"},
          {"reference": "linux-lib-rust-7.0.0"},
          {"reference": "linux-modules-7.0.0"},
          {"reference": "linux-tools-7.0.0"},
          {"reference": "linux-udebs-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');
}