Unity Linux 20.1050e Security Update: kernel (UTSA-2026-004878)

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

include('compat.inc');

if (description)
{
  script_id(296330);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/23");

  script_cve_id("CVE-2022-49841");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-004878)");

  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-2026-004878 advisory.

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

    serial: imx: Add missing .thaw_noirq hook

    The following warning is seen with non-console UART instance when
    system hibernates.

    [   37.371969] ------------[ cut here ]------------
    [   37.376599] uart3_root_clk already disabled
    [   37.380810] WARNING: CPU: 0 PID: 296 at drivers/clk/clk.c:952 clk_core_disable+0xa4/0xb0
    ...
    [   37.506986] Call trace:
    [   37.509432]  clk_core_disable+0xa4/0xb0
    [   37.513270]  clk_disable+0x34/0x50
    [   37.516672]  imx_uart_thaw+0x38/0x5c
    [   37.520250]  platform_pm_thaw+0x30/0x6c
    [   37.524089]  dpm_run_callback.constprop.0+0x3c/0xd4
    [   37.528972]  device_resume+0x7c/0x160
    [   37.532633]  dpm_resume+0xe8/0x230
    [   37.536036]  hibernation_snapshot+0x288/0x430
    [   37.540397]  hibernate+0x10c/0x2e0
    [   37.543798]  state_store+0xc4/0xd0
    [   37.547203]  kobj_attr_store+0x1c/0x30
    [   37.550953]  sysfs_kf_write+0x48/0x60
    [   37.554619]  kernfs_fop_write_iter+0x118/0x1ac
    [   37.559063]  new_sync_write+0xe8/0x184
    [   37.562812]  vfs_write+0x230/0x290
    [   37.566214]  ksys_write+0x68/0xf4
    [   37.569529]  __arm64_sys_write+0x20/0x2c
    [   37.573452]  invoke_syscall.constprop.0+0x50/0xf0
    [   37.578156]  do_el0_svc+0x11c/0x150
    [   37.581648]  el0_svc+0x30/0x140
    [   37.584792]  el0t_64_sync_handler+0xe8/0xf0
    [   37.588976]  el0t_64_sync+0x1a0/0x1a4
    [   37.592639] ---[ end trace 56e22eec54676d75 ]---

    On hibernating, pm core calls into related hooks in sequence like:

        .freeze
        .freeze_noirq
        .thaw_noirq
        .thaw

    With .thaw_noirq hook being absent, the clock will be disabled in a
    unbalanced call which results the warning above.

        imx_uart_freeze()
            clk_prepare_enable()
        imx_uart_suspend_noirq()
            clk_disable()
        imx_uart_thaw
            clk_disable_unprepare()

    Adding the missing .thaw_noirq hook as imx_uart_resume_noirq() will have
    the call sequence corrected as below and thus fix the warning.

        imx_uart_freeze()
            clk_prepare_enable()
        imx_uart_suspend_noirq()
            clk_disable()
        imx_uart_resume_noirq()
            clk_enable()
        imx_uart_thaw
            clk_disable_unprepare()

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-2026-004878
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9f86889c");
  # https://lore.kernel.org/linux-cve-announce/2025050140-CVE-2022-49841-8d40@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8b21a247");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49841");
  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-2022-49841");

  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:"2025/05/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/23");

  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-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.47', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.47', '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_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');
}