Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986969)

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

include('compat.inc');

if (description)
{
  script_id(268297);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2022-48734");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986969)");

  script_set_attribute(attribute:"synopsis", value:
"The Unity Linux host is missing one or more security updates.");
  script_set_attribute(attribute:"description", value:
"The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the
UTSA-2025-986969 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    btrfs: fix deadlock between quota disable and qgroup rescan worker

    Quota disable ioctl starts a transaction before waiting for the qgroup
    rescan worker completes. However, this wait can be infinite and results
    in deadlock because of circular dependency among the quota disable
    ioctl, the qgroup rescan worker and the other task with transaction such
    as block group relocation task.

    The deadlock happens with the steps following:

    1) Task A calls ioctl to disable quota. It starts a transaction and
       waits for qgroup rescan worker completes.
    2) Task B such as block group relocation task starts a transaction and
       joins to the transaction that task A started. Then task B commits to
       the transaction. In this commit, task B waits for a commit by task A.
    3) Task C as the qgroup rescan worker starts its job and starts a
       transaction. In this transaction start, task C waits for completion
       of the transaction that task A started and task B committed.

    This deadlock was found with fstests test case btrfs/115 and a zoned
    null_blk device. The test case enables and disables quota, and the
    block group reclaim was triggered during the quota disable by chance.
    The deadlock was also observed by running quota enable and disable in
    parallel with 'btrfs balance' command on regular null_blk devices.

    An example report of the deadlock:

      [372.469894] INFO: task kworker/u16:6:103 blocked for more than 122 seconds.
      [372.479944]       Not tainted 5.16.0-rc8 #7
      [372.485067] echo 0 > /proc/sys/kernel/hung_task_timeout_secs disables this message.
      [372.493898] task:kworker/u16:6   state:D stack:    0 pid:  103 ppid:     2 flags:0x00004000
      [372.503285] Workqueue: btrfs-qgroup-rescan btrfs_work_helper [btrfs]
      [372.510782] Call Trace:
      [372.514092]  <TASK>
      [372.521684]  __schedule+0xb56/0x4850
      [372.530104]  ? io_schedule_timeout+0x190/0x190
      [372.538842]  ? lockdep_hardirqs_on+0x7e/0x100
      [372.547092]  ? _raw_spin_unlock_irqrestore+0x3e/0x60
      [372.555591]  schedule+0xe0/0x270
      [372.561894]  btrfs_commit_transaction+0x18bb/0x2610 [btrfs]
      [372.570506]  ? btrfs_apply_pending_changes+0x50/0x50 [btrfs]
      [372.578875]  ? free_unref_page+0x3f2/0x650
      [372.585484]  ? finish_wait+0x270/0x270
      [372.591594]  ? release_extent_buffer+0x224/0x420 [btrfs]
      [372.599264]  btrfs_qgroup_rescan_worker+0xc13/0x10c0 [btrfs]
      [372.607157]  ? lock_release+0x3a9/0x6d0
      [372.613054]  ? btrfs_qgroup_account_extent+0xda0/0xda0 [btrfs]
      [372.620960]  ? do_raw_spin_lock+0x11e/0x250
      [372.627137]  ? rwlock_bug.part.0+0x90/0x90
      [372.633215]  ? lock_is_held_type+0xe4/0x140
      [372.639404]  btrfs_work_helper+0x1ae/0xa90 [btrfs]
      [372.646268]  process_one_work+0x7e9/0x1320
      [372.652321]  ? lock_release+0x6d0/0x6d0
      [372.658081]  ? pwq_dec_nr_in_flight+0x230/0x230
      [372.664513]  ? rwlock_bug.part.0+0x90/0x90
      [372.670529]  worker_thread+0x59e/0xf90
      [372.676172]  ? process_one_work+0x1320/0x1320
      [372.682440]  kthread+0x3b9/0x490
      [372.687550]  ? _raw_spin_unlock_irq+0x24/0x50
      [372.693811]  ? set_kthread_struct+0x100/0x100
      [372.700052]  ret_from_fork+0x22/0x30
      [372.705517]  </TASK>
      [372.709747] INFO: task btrfs-transacti:2347 blocked for more than 123 seconds.
      [372.729827]       Not tainted 5.16.0-rc8 #7
      [372.745907] echo 0 > /proc/sys/kernel/hung_task_timeout_secs disables this message.
      [372.767106] task:btrfs-transacti state:D stack:    0 pid: 2347 ppid:     2 flags:0x00004000
      [372.787776] Call Trace:
      [372.801652]  <TASK>
      [372.812961]  __schedule+0xb56/0x4850
      [372.830011]  ? io_schedule_timeout+0x190/0x190
      [372.852547]  ? lockdep_hardirqs_on+0x7e/0x100
      [372.871761]  ? _raw_spin_unlock_irqrestore+0x3e/0x60
      [372.886792]  schedule+0xe0/0x270
      [372.901685]  wait_current_trans+0x22c/0x310 [btrfs]
      [372.919743]  ? btrfs_put_transaction+0x3d0/0x3d0 [btrfs]
      [372.938923]  ? finish_wait+0x270/0x270
      [372.959085]  ? join_transaction+0xc7
    ---truncated---

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  # https://src.uniontech.com/#/security_advisory_detail?utsa_id=UTSA-2025-986969
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?54cc5fd1");
  # https://lore.kernel.org/linux-cve-announce/2024062000-CVE-2022-48734-88b7@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5a4308d1");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48734");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/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:L/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-2022-48734");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2022/03/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/07");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Unity Linux Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info2.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/UOS-Server/release", "Host/UOS-Server/rpm-list", "Host/cpu");

  exit(0);
}
include('rpm2.inc');

if (!get_kb_item('Host/local_checks_enabled')) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var os_product = get_kb_item('installed_os/local/SSH/0/product');
if (isnull(os_product) || 'UOS Server' >!< os_product) audit(AUDIT_OS_NOT, 'UOS Server');
var os_version = get_kb_item('installed_os/local/SSH/0/version');
if (isnull(os_version)) audit(AUDIT_UNKNOWN_APP_VER, 'UOS Server');
if (! preg(pattern:"^20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070e', 'UOS Server ' + os_version);

if (!get_kb_item('Host/UOS-Server/rpm-list')) audit(AUDIT_PACKAGE_LIST_MISSING);

var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('aarch64' >!< cpu && 'amd64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  }
];

var os_release = get_one_kb_item('installed_os/local/SSH/0/release');
var os_sp = get_one_kb_item('Host/*/minor_release');

var flag = 0;
var reference;
var sp;
var _cpu;
var el_string;
var rpm_spec_vers_cmp;
var epoch;
var allowmaj;
var exists_check;
var cves;
foreach var constraint ( constraints ) {
  # Check that the target release is equal to the affected release
  if (!empty_or_null(constraint['release'])){
    if (constraint['release'] != os_release) continue;
  }
  if (!empty_or_null(constraint['sp'])){
    if (constraint['sp'] != os_sp) continue;
  }
  foreach var pkg ( constraint['pkgs'] ) {
    reference = NULL;
    sp = NULL;
    _cpu = NULL;
    el_string = NULL;
    rpm_spec_vers_cmp = NULL;
    epoch = NULL;
    allowmaj = NULL;
    exists_check = NULL;
    cves = NULL;
    if (!empty_or_null(pkg['reference'])) reference = pkg['reference'];
    if (!empty_or_null(pkg['sp'])) sp = pkg['sp'];
    if (!empty_or_null(pkg['cpu'])) _cpu = pkg['cpu'];
    if (!empty_or_null(pkg['el_string'])) el_string = pkg['el_string'];
    if (!empty_or_null(pkg['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = pkg['rpm_spec_vers_cmp'];
    if (!empty_or_null(pkg['epoch'])) epoch = pkg['epoch'];
    if (!empty_or_null(pkg['allowmaj'])) allowmaj = pkg['allowmaj'];
    if (!empty_or_null(pkg['exists_check'])) exists_check = pkg['exists_check'];
    if (!empty_or_null(pkg['cves'])) cves = pkg['cves'];
    if (reference &&
        ## (no known rpm to check OR known rpm_exists)
        (!exists_check || rpm_exists(rpm:exists_check)) &&
        rpm_check(sp:sp, cpu:_cpu, reference:reference, epoch:epoch, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj, cves:cves)) flag++;
  }
}


if (flag)
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  var tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'kernel');
}