Linux Distros Unpatched Vulnerability : CVE-2026-64181

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

include('compat.inc');

if (description)
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  script_id(328174);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/07/25");

  script_cve_id("CVE-2026-64181");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-64181");

  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: mm: fix __vm_normal_page() to handle
    missing support for pmd_special()/pud_special() On x86 32-bit with THP enabled, zap_huge_pmd() is seen to
    generate a WARNING: mm/memory.c:735 at __vm_normal_page+0x6a/0x7d, from the
    VM_WARN_ON_ONCE(is_zero_pfn(pfn) || is_huge_zero_pfn(pfn)); followed by BUG: Bad rss-counter states,
    then later BUG: Bad page states when reclaim gets to call shrink_huge_zero_folio_scan(). It's as if the
    _PAGE_SPECIAL bit never got set in the huge_zero pmd: and indeed, whereas pte_special() and
    pte_mkspecial() are subject to a dedicated CONFIG_ARCH_HAS_PTE_SPECIAL, pmd_special() and pmd_mkspecial()
    are subject to CONFIG_ARCH_SUPPORTS_PMD_PFNMAP, which is never enabled on any 32-bit architecture. While
    the problem was exposed through commit d80a9cb1a64a (mm/huge_memory: add and use
    normal_or_softleaf_folio_pmd()), it was an oversight in commit af38538801c6 (mm/memory: factor out
    common code from vm_normal_page_*()) and would result in other problems: * huge zero folio accounted in
    smaps, pagemap (PAGE_IS_FILE) and numamaps as file-backed THP * folio_walk_start() returning the folio
    even without FW_ZEROPAGE set. Callers seem to tolerate that, though. ... and triggering the
    VM_WARN_ON_ONE(), although never reported so far. To fix it, teach
    vm_normal_page_pmd()/vm_normal_page_pud() to consider whether pmd_special/pud_special is actually
    implemented. (CVE-2026-64181)

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-2026-64181");
  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:P/I:N/A:N");
  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:H/I:H/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-2026-64181");

  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:"2026/07/19");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/07/20");

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  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.");

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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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          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-6.14"},
          {"reference": "linux-azure-fde-6.14"},
          {"reference": "linux-azure-fde-6.17"},
          {"reference": "linux-azure-nvidia-6.14"},
          {"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-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-hwe-6.14"},
          {"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-7.0"},
          {"reference": "linux-oem-6.11"},
          {"reference": "linux-oem-6.14"},
          {"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-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-26.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "26.04",
        "pkgs": [
          {"reference": "linux-aws-cloud-tools-7.0.0"},
          {"reference": "linux-aws-headers-7.0.0"},
          {"reference": "linux-aws-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-7.0.0"},
          {"reference": "linux-image-unsigned-7.0.0"},
          {"reference": "linux-modules-7.0.0"},
          {"reference": "linux-nvidia"},
          {"reference": "linux-nvidia-bos"},
          {"reference": "linux-raspi-headers-7.0.0"},
          {"reference": "linux-raspi-tools-7.0.0"},
          {"reference": "linux-tools-7.0.0"},
          {"reference": "linux-udebs-aws"},
          {"reference": "linux-udebs-aws-64k"}
        ]
      }
    ]
  }
};

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 third_party_support = get_kb_item('Host/OS/extended-third-party');
if (!empty_or_null(third_party_support)) {
    var third_party_vendors = distro_constraints_values['third_party'];
    if (!empty_or_null(third_party_vendors)) {
        var vendor;
        foreach vendor (third_party_vendors) {
            if (vendor == third_party_support) exit(0, 'A third party management patch is available for this vulnerability from ' + vendor + '.\n');
        }
    }
}

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_NOTE,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}