Linux Distros Unpatched Vulnerability : CVE-2024-26956

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

include('compat.inc');

if (description)
{
  script_id(260479);
  script_version("1.9");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2024-26956");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2024-26956");

  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.

  - nilfs2: fix failure to detect DAT corruption in btree and direct mappings Patch series nilfs2: fix kernel
    bug at submit_bh_wbc(). This resolves a kernel BUG reported by syzbot. Since there are two flaws
    involved, I've made each one a separate patch. The first patch alone resolves the syzbot-reported bug, but
    I think both fixes should be sent to stable, so I've tagged them as such. This patch (of 2): Syzbot has
    reported a kernel bug in submit_bh_wbc() when writing file data to a nilfs2 file system whose metadata is
    corrupted. There are two flaws involved in this issue. The first flaw is that when nilfs_get_block()
    locates a data block using btree or direct mapping, if the disk address translation routine
    nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata corruption, it can be passed
    back to nilfs_get_block(). This causes nilfs_get_block() to misidentify an existing block as non-existent,
    causing both data block lookup and insertion to fail inconsistently. The second flaw is that
    nilfs_get_block() returns a successful status in this inconsistent state. This causes the caller
    __block_write_begin_int() or others to request a read even though the buffer is not mapped, resulting in a
    BUG_ON check for the BH_Mapped flag in submit_bh_wbc() failing. This fixes the first issue by changing the
    return value to code -EINVAL when a conversion using DAT fails with code -ENOENT, avoiding the conflicting
    condition that leads to the kernel bug described above. Here, code -EINVAL indicates that metadata
    corruption was detected during the block lookup, which will be properly handled as a file system error and
    converted to -EIO when passing through the nilfs2 bmap layer. (CVE-2024-26956)

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-2024-26956");
  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:C/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: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-2024-26956");

  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:"2024/05/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/02");

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  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");
  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");

  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": "linux-aws"},
          {"reference": "linux-azure"},
          {"reference": "linux-cloud-tools-3.13.0"},
          {"reference": "linux-cloud-tools-common"},
          {"reference": "linux-doc"},
          {"reference": "linux-headers-3.13.0"},
          {"reference": "linux-image-3.13.0"},
          {"reference": "linux-image-extra-3.13.0"},
          {"reference": "linux-libc-dev"},
          {"reference": "linux-lts-xenial"},
          {"reference": "linux-source-3.13.0"},
          {"reference": "linux-tools-3.13.0"},
          {"reference": "linux-tools-common"},
          {"reference": "linux-udebs-generic"},
          {"reference": "linux-udebs-generic-lpae"},
          {"reference": "linux-udebs-lowlatency"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "linux-aws"},
          {"reference": "linux-aws-hwe"},
          {"reference": "linux-azure"},
          {"reference": "linux-cloud-tools-4.4.0"},
          {"reference": "linux-cloud-tools-common"},
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  },
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    "package_manager": "dpkg-l",
    "constraints": [
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          {"reference": "linux-hwe-6.2"},
          {"reference": "linux-hwe-6.5"},
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};

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');
}