Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987369)

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

include('compat.inc');

if (description)
{
  script_id(267979);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2021-47097");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987369)");

  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-2025-987369 advisory.

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

    Input: elantech - fix stack out of bound access in elantech_change_report_id()

    The array param[] in elantech_change_report_id() must be at least 3
    bytes, because elantech_read_reg_params() is calling ps2_command() with
    PSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but
    it's defined in the stack as an array of 2 bytes, therefore we have a
    potential stack out-of-bounds access here, also confirmed by KASAN:

    [    6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0
    [    6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118

    [    6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110
    [    6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020
    [    6.512436] Workqueue: events_long serio_handle_event
    [    6.512453] Call Trace:
    [    6.512462]  show_stack+0x52/0x58
    [    6.512474]  dump_stack+0xa1/0xd3
    [    6.512487]  print_address_description.constprop.0+0x1d/0x140
    [    6.512502]  ? __ps2_command+0x372/0x7e0
    [    6.512516]  __kasan_report.cold+0x7d/0x112
    [    6.512527]  ? _raw_write_lock_irq+0x20/0xd0
    [    6.512539]  ? __ps2_command+0x372/0x7e0
    [    6.512552]  kasan_report+0x3c/0x50
    [    6.512564]  __asan_load1+0x6a/0x70
    [    6.512575]  __ps2_command+0x372/0x7e0
    [    6.512589]  ? ps2_drain+0x240/0x240
    [    6.512601]  ? dev_printk_emit+0xa2/0xd3
    [    6.512612]  ? dev_vprintk_emit+0xc5/0xc5
    [    6.512621]  ? __kasan_check_write+0x14/0x20
    [    6.512634]  ? mutex_lock+0x8f/0xe0
    [    6.512643]  ? __mutex_lock_slowpath+0x20/0x20
    [    6.512655]  ps2_command+0x52/0x90
    [    6.512670]  elantech_ps2_command+0x4f/0xc0 [psmouse]
    [    6.512734]  elantech_change_report_id+0x1e6/0x256 [psmouse]
    [    6.512799]  ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse]
    [    6.512863]  ? ps2_command+0x7f/0x90
    [    6.512877]  elantech_query_info.cold+0x6bd/0x9ed [psmouse]
    [    6.512943]  ? elantech_setup_ps2+0x460/0x460 [psmouse]
    [    6.513005]  ? psmouse_reset+0x69/0xb0 [psmouse]
    [    6.513064]  ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse]
    [    6.513122]  ? phys_pmd_init+0x30e/0x521
    [    6.513137]  elantech_init+0x8a/0x200 [psmouse]
    [    6.513200]  ? elantech_init_ps2+0xf0/0xf0 [psmouse]
    [    6.513249]  ? elantech_query_info+0x440/0x440 [psmouse]
    [    6.513296]  ? synaptics_send_cmd+0x60/0x60 [psmouse]
    [    6.513342]  ? elantech_query_info+0x440/0x440 [psmouse]
    [    6.513388]  ? psmouse_try_protocol+0x11e/0x170 [psmouse]
    [    6.513432]  psmouse_extensions+0x65d/0x6e0 [psmouse]
    [    6.513476]  ? psmouse_try_protocol+0x170/0x170 [psmouse]
    [    6.513519]  ? mutex_unlock+0x22/0x40
    [    6.513526]  ? ps2_command+0x7f/0x90
    [    6.513536]  ? psmouse_probe+0xa3/0xf0 [psmouse]
    [    6.513580]  psmouse_switch_protocol+0x27d/0x2e0 [psmouse]
    [    6.513624]  psmouse_connect+0x272/0x530 [psmouse]
    [    6.513669]  serio_driver_probe+0x55/0x70
    [    6.513679]  really_probe+0x190/0x720
    [    6.513689]  driver_probe_device+0x160/0x1f0
    [    6.513697]  device_driver_attach+0x119/0x130
    [    6.513705]  ? device_driver_attach+0x130/0x130
    [    6.513713]  __driver_attach+0xe7/0x1a0
    [    6.513720]  ? device_driver_attach+0x130/0x130
    [    6.513728]  bus_for_each_dev+0xfb/0x150
    [    6.513738]  ? subsys_dev_iter_exit+0x10/0x10
    [    6.513748]  ? _raw_write_unlock_bh+0x30/0x30
    [    6.513757]  driver_attach+0x2d/0x40
    [    6.513764]  serio_handle_event+0x199/0x3d0
    [    6.513775]  process_one_work+0x471/0x740
    [    6.513785]  worker_thread+0x2d2/0x790
    [    6.513794]  ? process_one_work+0x740/0x740
    [    6.513802]  kthread+0x1b4/0x1e0
    [    6.513809]  ? set_kthread_struct+0x80/0x80
    [    6.513816]  ret_from_fork+0x22/0x30

    [    6.513832] The buggy address belongs to the page:
    [    6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7
    [    6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)
    [    6.513860] raw: 0
    ---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-2025-987369
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0faec9cc");
  # https://lore.kernel.org/linux-cve-announce/2024030415-CVE-2021-47097-e7f4@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1b31aef9");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-47097");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:C/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-47097");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/21");
  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');
}