Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099989)

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

include('compat.inc');

if (description)
{
  script_id(336398);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2026-46304");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099989)");

  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-2026-099989 advisory.

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

    nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free

    nvmet_tcp_release_queue_work() runs on nvmet-wq and can drop the
    final controller reference through nvmet_cq_put(). If that triggers
    nvmet_ctrl_free(), the teardown path flushes ctrl->async_event_work on
    the same nvmet-wq.

    Call chain:

     nvmet_tcp_schedule_release_queue()
       kref_put(&queue->kref, nvmet_tcp_release_queue)
         nvmet_tcp_release_queue()
           queue_work(nvmet_wq, &queue->release_work) <--- nvmet_wq
             process_one_work()
               nvmet_tcp_release_queue_work()
                 nvmet_cq_put(&queue->nvme_cq)
                   nvmet_cq_destroy()
                     nvmet_ctrl_put(cq->ctrl)
                       nvmet_ctrl_free()
                         flush_work(&ctrl->async_event_work) <--- nvmet_wq

                          Previously Scheduled by :-
                            nvmet_add_async_event
                              queue_work(nvmet_wq, &ctrl->async_event_work);

    This trips lockdep with a possible recursive locking warning.

    [ 5223.015876] run blktests nvme/003 at 2026-04-07 20:53:55
    [ 5223.061801] loop0: detected capacity change from 0 to 2097152
    [ 5223.072206] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
    [ 5223.088368] nvmet_tcp: enabling port 0 (127.0.0.1:4420)
    [ 5223.126086] nvmet: Created discovery controller 1 for subsystem nqn.2014-08.org.nvmexpress.discovery
    for NQN nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349.
    [ 5223.128453] nvme nvme1: new ctrl: NQN nqn.2014-08.org.nvmexpress.discovery, addr 127.0.0.1:4420,
    hostnqn: nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349
    [ 5233.199447] nvme nvme1: Removing ctrl: NQN nqn.2014-08.org.nvmexpress.discovery

    [ 5233.227718] ============================================
    [ 5233.231283] WARNING: possible recursive locking detected
    [ 5233.234696] 7.0.0-rc3nvme+ #20 Tainted: G           O     N
    [ 5233.238434] --------------------------------------------
    [ 5233.241852] kworker/u192:6/2413 is trying to acquire lock:
    [ 5233.245429] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x26/0x90
    [ 5233.251438]
                   but task is already holding lock:
    [ 5233.255254] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc/0x6e0
    [ 5233.261125]
                   other info that might help us debug this:
    [ 5233.265333]  Possible unsafe locking scenario:

    [ 5233.269217]        CPU0
    [ 5233.270795]        ----
    [ 5233.272436]   lock((wq_completion)nvmet-wq);
    [ 5233.275241]   lock((wq_completion)nvmet-wq);
    [ 5233.278020]
                    *** DEADLOCK ***

    [ 5233.281793]  May be due to missing lock nesting notation

    [ 5233.286195] 3 locks held by kworker/u192:6/2413:
    [ 5233.289192]  #0: ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at:
    process_one_work+0x5cc/0x6e0
    [ 5233.294569]  #1: ffffc9000e2a7e40 ((work_completion)(&queue->release_work)){+.+.}-{0:0}, at:
    process_one_work+0x1c5/0x6e0
    [ 5233.300128]  #2: ffffffff82d7dc40 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x62/0x530
    [ 5233.304290]
                   stack backtrace:
    [ 5233.306520] CPU: 4 UID: 0 PID: 2413 Comm: kworker/u192:6 Tainted: G           O     N  7.0.0-rc3nvme+
    #20 PREEMPT(full)
    [ 5233.306524] Tainted: [O]=OOT_MODULE, [N]=TEST
    [ 5233.306525] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014
    [ 5233.306527] Workqueue: nvmet-wq nvmet_tcp_release_queue_work [nvmet_tcp]
    [ 5233.306532] Call Trace:
    [ 5233.306534]  <TASK>
    [ 5233.306536]  dump_stack_lvl+0x73/0xb0
    [ 5233.306552]  print_deadlock_bug+0x225/0x2f0
    [ 5233.306556]  __lock_acquire+0x13f0/0x2290
    [ 5233.306563]  lock_acquire+0xd0/0x300
    [ 5233.306565]  ? touch_wq_lockdep_map+0x26/0x90
    [ 5233.306571]  ? __flush_work+0x20b/0x530
    [ 5233.306573]  ? touch_wq_lockdep_map+0x26/0x90
    [ 5233.306577]  touch_wq_lockdep_map+0x3b/0x90
    [ 5233.306580]  ? touch_wq_lockdep_map+0x26/0x90
    [ 52
    ---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-2026-099989
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?43dd6c87");
  # https://lore.kernel.org/linux-cve-announce/2026060800-CVE-2026-46304-be50@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?7d2f162b");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2026-46304");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/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:N/AC:L/PR:N/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-2026-46304");

  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:"2026/06/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/17");

  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) 2026 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:"^20.1050e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e', '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': '1050e',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', '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_HOLE,
      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');
}