Linux Distros Unpatched Vulnerability : CVE-2025-38365

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

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  script_id(244490);
  script_version("1.23");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2025-38365");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-38365");

  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: btrfs: fix a race between renames and
    directory logging We have a race between a rename and directory inode logging that if it happens and we
    crash/power fail before the rename completes, the next time the filesystem is mounted, the log replay code
    will end up deleting the file that was being renamed. This is best explained following a step by step
    analysis of an interleaving of steps that lead into this situation. Consider the initial conditions: 1) We
    are at transaction N; 2) We have directories A and B created in a past transaction (< N); 3) We have inode
    X corresponding to a file that has 2 hardlinks, one in directory A and the other in directory B, so we'll
    name them as A/foo_link1 and B/foo_link2. Both hard links were persisted in a past transaction (< N);
    4) We have inode Y corresponding to a file that as a single hard link and is located in directory A, we'll
    name it as A/bar. This file was also persisted in a past transaction (< N). The steps leading to a file
    loss are the following and for all of them we are under transaction N: 1) Link A/foo_link1 is removed,
    so inode's X last_unlink_trans field is updated to N, through btrfs_unlink() -> btrfs_record_unlink_dir();
    2) Task A starts a rename for inode Y, with the goal of renaming from A/bar to A/baz, so we enter
    btrfs_rename(); 3) Task A inserts the new BTRFS_INODE_REF_KEY for inode Y by calling
    btrfs_insert_inode_ref(); 4) Because the rename happens in the same directory, we don't set the
    last_unlink_trans field of directoty A's inode to the current transaction id, that is, we don't cal
    btrfs_record_unlink_dir(); 5) Task A then removes the entries from directory A (BTRFS_DIR_ITEM_KEY and
    BTRFS_DIR_INDEX_KEY items) when calling __btrfs_unlink_inode() (actually the dir index item is added as a
    delayed item, but the effect is the same); 6) Now before task A adds the new entry A/baz to directory A
    by calling btrfs_add_link(), another task, task B is logging inode X; 7) Task B starts a fsync of inode X
    and after logging inode X, at btrfs_log_inode_parent() it calls btrfs_log_all_parents(), since inode X has
    a last_unlink_trans value of N, set at in step 1; 8) At btrfs_log_all_parents() we search for all parent
    directories of inode X using the commit root, so we find directories A and B and log them. Bu when logging
    direct A, we don't have a dir index item for inode Y anymore, neither the old name A/bar nor for the new
    name A/baz since the rename has deleted the old name but has not yet inserted the new name - task A
    hasn't called yet btrfs_add_link() to do that. Note that logging directory A doesn't fallback to a
    transaction commit because its last_unlink_trans has a lower value than the current transaction's id (see
    step 4); 9) Task B finishes logging directories A and B and gets back to btrfs_sync_file() where it calls
    btrfs_sync_log() to persist the log tree; 10) Task B successfully persisted the log tree, btrfs_sync_log()
    completed with success, and a power failure happened. We have a log tree without any directory entry for
    inode Y, so the log replay code deletes the entry for inode Y, name A/bar, from the subvolume tree since
    it doesn't exist in the log tree and the log tree is authorative for its index (we logged a
    BTRFS_DIR_LOG_INDEX_KEY item that covers the index range for the dentry that corresponds to A/bar).
    Since there's no other hard link for inode Y and the log replay code deletes the name A/bar, the file is
    lost. The issue wouldn't happen if task B synced the log only after task A called btrfs_log_new_name(),
    which would update the log with the new name for inode Y (A/bar). Fix this by pinning the log root
    during renames before removing the old directory entry, and unpinning af ---truncated--- (CVE-2025-38365)

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-2025-38365");
  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:N/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:H/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-2025-38365");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/06");

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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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    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "linux-azure-6.11"},
          {"reference": "linux-azure-fde"},
          {"reference": "linux-azure-fde-6.17"},
          {"reference": "linux-azure-nvidia"},
          {"reference": "linux-buildinfo-6.8.0"},
          {"reference": "linux-cloud-tools-6.8.0"},
          {"reference": "linux-gcp-6.11"},
          {"reference": "linux-headers-6.8.0"},
          {"reference": "linux-hwe-6.11"},
          {"reference": "linux-image-6.8.0"},
          {"reference": "linux-image-unsigned-6.8.0"},
          {"reference": "linux-intel"},
          {"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-oem-6.11"},
          {"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-raspi-realtime"},
          {"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-25.10": {
    "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');
}