Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992930)

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

include('compat.inc');

if (description)
{
  script_id(281222);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2022-50149");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992930)");

  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-2025-992930 advisory.

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

    driver core: fix potential deadlock in __driver_attach

    In __driver_attach function, There are also AA deadlock problem,
    like the commit b232b02bf3c2 (driver core: fix deadlock in
    __device_attach).

    stack like commit b232b02bf3c2 (driver core: fix deadlock in
    __device_attach).
    list below:
        In __driver_attach function, The lock holding logic is as follows:
        ...
        __driver_attach
        if (driver_allows_async_probing(drv))
          device_lock(dev)      // get lock dev
            async_schedule_dev(__driver_attach_async_helper, dev); // func
              async_schedule_node
                async_schedule_node_domain(func)
                  entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC);
                  /* when fail or work limit, sync to execute func, but
                     __driver_attach_async_helper will get lock dev as
                     will, which will lead to A-A deadlock.  */
                  if (!entry || atomic_read(&entry_count) > MAX_WORK) {
                    func;
                  else
                    queue_work_node(node, system_unbound_wq, &entry->work)
          device_unlock(dev)

        As above show, when it is allowed to do async probes, because of
        out of memory or work limit, async work is not be allowed, to do
        sync execute instead. it will lead to A-A deadlock because of
        __driver_attach_async_helper getting lock dev.

    Reproduce:
    and it can be reproduce by make the condition
    (if (!entry || atomic_read(&entry_count) > MAX_WORK)) untenable, like
    below:

    [  370.785650] echo 0 > /proc/sys/kernel/hung_task_timeout_secs disables
    this message.
    [  370.787154] task:swapper/0       state:D stack:    0 pid:    1 ppid:
    0 flags:0x00004000
    [  370.788865] Call Trace:
    [  370.789374]  <TASK>
    [  370.789841]  __schedule+0x482/0x1050
    [  370.790613]  schedule+0x92/0x1a0
    [  370.791290]  schedule_preempt_disabled+0x2c/0x50
    [  370.792256]  __mutex_lock.isra.0+0x757/0xec0
    [  370.793158]  __mutex_lock_slowpath+0x1f/0x30
    [  370.794079]  mutex_lock+0x50/0x60
    [  370.794795]  __device_driver_lock+0x2f/0x70
    [  370.795677]  ? driver_probe_device+0xd0/0xd0
    [  370.796576]  __driver_attach_async_helper+0x1d/0xd0
    [  370.797318]  ? driver_probe_device+0xd0/0xd0
    [  370.797957]  async_schedule_node_domain+0xa5/0xc0
    [  370.798652]  async_schedule_node+0x19/0x30
    [  370.799243]  __driver_attach+0x246/0x290
    [  370.799828]  ? driver_allows_async_probing+0xa0/0xa0
    [  370.800548]  bus_for_each_dev+0x9d/0x130
    [  370.801132]  driver_attach+0x22/0x30
    [  370.801666]  bus_add_driver+0x290/0x340
    [  370.802246]  driver_register+0x88/0x140
    [  370.802817]  ? virtio_scsi_init+0x116/0x116
    [  370.803425]  scsi_register_driver+0x1a/0x30
    [  370.804057]  init_sd+0x184/0x226
    [  370.804533]  do_one_initcall+0x71/0x3a0
    [  370.805107]  kernel_init_freeable+0x39a/0x43a
    [  370.805759]  ? rest_init+0x150/0x150
    [  370.806283]  kernel_init+0x26/0x230
    [  370.806799]  ret_from_fork+0x1f/0x30

    To fix the deadlock, move the async_schedule_dev outside device_lock,
    as we can see, in async_schedule_node_domain, the parameter of
    queue_work_node is system_unbound_wq, so it can accept concurrent
    operations. which will also not change the code logic, and will
    not lead to deadlock.

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-2025-992930
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?33e90434");
  # https://lore.kernel.org/linux-cve-announce/2025061821-CVE-2022-50149-5467@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c233be90");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50149");
  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-2022-50149");

  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:"2022/10/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 20.1070a', '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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', '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');
}