Linux Distros Unpatched Vulnerability : CVE-2025-38358

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

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  script_version("1.4");
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  script_cve_id("CVE-2025-38358");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2025-38358");

  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 race between async reclaim
    worker and close_ctree() Syzbot reported an assertion failure due to an attempt to add a delayed iput
    after we have set BTRFS_FS_STATE_NO_DELAYED_IPUT in the fs_info state: WARNING: CPU: 0 PID: 65 at
    fs/btrfs/inode.c:3420 btrfs_add_delayed_iput+0x2f8/0x370 fs/btrfs/inode.c:3420 Modules linked in: CPU: 0
    UID: 0 PID: 65 Comm: kworker/u8:4 Not tainted 6.15.0-next-20250530-syzkaller #0 PREEMPT(full) Hardware
    name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: btrfs-endio-
    write btrfs_work_helper RIP: 0010:btrfs_add_delayed_iput+0x2f8/0x370 fs/btrfs/inode.c:3420 Code: 4e ad 5d
    (...) RSP: 0018:ffffc9000213f780 EFLAGS: 00010293 RAX: ffffffff83c635b7 RBX: ffff888058920000 RCX:
    ffff88801c769e00 RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000 RBP: 0000000000000001
    R08: ffff888058921b67 R09: 1ffff1100b12436c R10: dffffc0000000000 R11: ffffed100b12436d R12:
    0000000000000001 R13: dffffc0000000000 R14: ffff88807d748000 R15: 0000000000000100 FS:
    0000000000000000(0000) GS:ffff888125c53000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0:
    0000000080050033 CR2: 00002000000bd038 CR3: 000000006a142000 CR4: 00000000003526f0 DR0: 0000000000000000
    DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
    0000000000000400 Call Trace: <TASK> btrfs_put_ordered_extent+0x19f/0x470 fs/btrfs/ordered-data.c:635
    btrfs_finish_one_ordered+0x11d8/0x1b10 fs/btrfs/inode.c:3312 btrfs_work_helper+0x399/0xc20 fs/btrfs/async-
    thread.c:312 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0
    kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0
    kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30
    arch/x86/entry/entry_64.S:245 </TASK> This can happen due to a race with the async reclaim worker like
    this: 1) The async metadata reclaim worker enters shrink_delalloc(), which calls
    btrfs_start_delalloc_roots() with an nr_pages argument that has a value less than LONG_MAX, and that in
    turn enters start_delalloc_inodes(), which sets the local variable 'full_flush' to false because
    wbc->nr_to_write is less than LONG_MAX; 2) There it finds inode X in a root's delalloc list, grabs a
    reference for inode X (with igrab()), and triggers writeback for it with filemap_fdatawrite_wbc(), which
    creates an ordered extent for inode X; 3) The unmount sequence starts from another task, we enter
    close_ctree() and we flush the workqueue fs_info->endio_write_workers, which waits for the ordered extent
    for inode X to complete and when dropping the last reference of the ordered extent, with
    btrfs_put_ordered_extent(), when we call btrfs_add_delayed_iput() we don't add the inode to the list of
    delayed iputs because it has a refcount of 2, so we decrement it to 1 and return; 4) Shortly after at
    close_ctree() we call btrfs_run_delayed_iputs() which runs all delayed iputs, and then we set
    BTRFS_FS_STATE_NO_DELAYED_IPUT in the fs_info state; 5) The async reclaim worker, after calling
    filemap_fdatawrite_wbc(), now calls btrfs_add_delayed_iput() for inode X and there we trigger an assertion
    failure since the fs_info state has the flag BTRFS_FS_STATE_NO_DELAYED_IPUT set. Fix this by setting
    BTRFS_FS_STATE_NO_DELAYED_IPUT only after we wait for the async reclaim workers to finish, after we call
    cancel_work_sync() for them at close_ctree(), and by running delayed iputs after wait for the reclaim
    workers to finish and before setting the bit. This race was recently introduced by commit 19e60b2a95f5
    (btrfs: add extra warning if delayed iput is added when it's not allowed). Without the new validation at
    btrfs_add_delayed_iput(), ---truncated--- (CVE-2025-38358)

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-2025-38358");
  script_set_attribute(attribute:"solution", value:
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  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-38358");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
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  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/25");
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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-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-lowlatency-hwe-6.11"},
          {"reference": "linux-modules-6.8.0"},
          {"reference": "linux-modules-iwlwifi-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"}
        ]
      }
    ]
  }
};

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');
}