Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986908)

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

include('compat.inc');

if (description)
{
  script_id(268478);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2021-47540");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986908)");

  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-2025-986908 advisory.

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

    mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode

    Fix the following NULL pointer dereference in mt7915_get_phy_mode
    routine adding an ibss interface to the mt7915 driver.

    [  101.137097] wlan0: Trigger new scan to find an IBSS to join
    [  102.827039] wlan0: Creating new IBSS network, BSSID 26:a4:50:1a:6e:69
    [  103.064756] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
    [  103.073670] Mem abort info:
    [  103.076520]   ESR = 0x96000005
    [  103.079614]   EC = 0x25: DABT (current EL), IL = 32 bits
    [  103.084934]   SET = 0, FnV = 0
    [  103.088042]   EA = 0, S1PTW = 0
    [  103.091215] Data abort info:
    [  103.094104]   ISV = 0, ISS = 0x00000005
    [  103.098041]   CM = 0, WnR = 0
    [  103.101044] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000460b1000
    [  103.107565] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
    [  103.116590] Internal error: Oops: 96000005 [#1] SMP
    [  103.189066] CPU: 1 PID: 333 Comm: kworker/u4:3 Not tainted 5.10.75 #0
    [  103.195498] Hardware name: MediaTek MT7622 RFB1 board (DT)
    [  103.201124] Workqueue: phy0 ieee80211_iface_work [mac80211]
    [  103.206695] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--)
    [  103.212705] pc : mt7915_get_phy_mode+0x68/0x120 [mt7915e]
    [  103.218103] lr : mt7915_mcu_add_bss_info+0x11c/0x760 [mt7915e]
    [  103.223927] sp : ffffffc011cdb9e0
    [  103.227235] x29: ffffffc011cdb9e0 x28: ffffff8006563098
    [  103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40
    [  103.237855] x25: 0000000000000001 x24: 000000000000011f
    [  103.243165] x23: ffffff8005f4e260 x22: ffffff8006567918
    [  103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58
    [  103.253785] x19: ffffff8006744400 x18: 0000000000000000
    [  103.259094] x17: 0000000000000000 x16: 0000000000000001
    [  103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8
    [  103.269713] x13: 0000000000000000 x12: 0000000000000000
    [  103.275024] x11: ffffffc010e30c20 x10: 0000000000000000
    [  103.280333] x9 : 0000000000000050 x8 : ffffff8006567d88
    [  103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44
    [  103.290952] x5 : 0000000000000002 x4 : 0000000000000001
    [  103.296262] x3 : 0000000000000001 x2 : 0000000000000001
    [  103.301572] x1 : 0000000000000000 x0 : 0000000000000011
    [  103.306882] Call trace:
    [  103.309328]  mt7915_get_phy_mode+0x68/0x120 [mt7915e]
    [  103.314378]  mt7915_bss_info_changed+0x198/0x200 [mt7915e]
    [  103.319941]  ieee80211_bss_info_change_notify+0x128/0x290 [mac80211]
    [  103.326360]  __ieee80211_sta_join_ibss+0x308/0x6c4 [mac80211]
    [  103.332171]  ieee80211_sta_create_ibss+0x8c/0x10c [mac80211]
    [  103.337895]  ieee80211_ibss_work+0x3dc/0x614 [mac80211]
    [  103.343185]  ieee80211_iface_work+0x388/0x3f0 [mac80211]
    [  103.348495]  process_one_work+0x288/0x690
    [  103.352499]  worker_thread+0x70/0x464
    [  103.356157]  kthread+0x144/0x150
    [  103.359380]  ret_from_fork+0x10/0x18
    [  103.362952] Code: 394008c3 52800220 394000e4 7100007f (39400023)

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-2025-986908
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f9dc88a5");
  # https://lore.kernel.org/linux-cve-announce/2024052439-CVE-2021-47540-3bea@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d50571ae");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-47540");
  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-2021-47540");

  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:"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');
}