Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989089)

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

include('compat.inc');

if (description)
{
  script_id(273226);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2021-47633");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989089)");

  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-2025-989089 advisory.

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

    ath5k: fix OOB in ath5k_eeprom_read_pcal_info_5111

    The bug was found during fuzzing. Stacktrace locates it in
    ath5k_eeprom_convert_pcal_info_5111.
    When none of the curve is selected in the loop, idx can go
    up to AR5K_EEPROM_N_PD_CURVES. The line makes pd out of bound.
    pd = &chinfo[pier].pd_curves[idx];

    There are many OOB writes using pd later in the code. So I
    added a sanity check for idx. Checks for other loops involving
    AR5K_EEPROM_N_PD_CURVES are not needed as the loop index is not
    used outside the loops.

    The patch is NOT tested with real device.

    The following is the fuzzing report

    BUG: KASAN: slab-out-of-bounds in ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
    Write of size 1 at addr ffff8880174a4d60 by task modprobe/214

    CPU: 0 PID: 214 Comm: modprobe Not tainted 5.6.0 #1
    Call Trace:
     dump_stack+0x76/0xa0
     print_address_description.constprop.0+0x16/0x200
     ? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
     ? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
     __kasan_report.cold+0x37/0x7c
     ? ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
     kasan_report+0xe/0x20
     ath5k_eeprom_read_pcal_info_5111+0x126a/0x1390 [ath5k]
     ? apic_timer_interrupt+0xa/0x20
     ? ath5k_eeprom_init_11a_pcal_freq+0xbc0/0xbc0 [ath5k]
     ? ath5k_pci_eeprom_read+0x228/0x3c0 [ath5k]
     ath5k_eeprom_init+0x2513/0x6290 [ath5k]
     ? ath5k_eeprom_init_11a_pcal_freq+0xbc0/0xbc0 [ath5k]
     ? usleep_range+0xb8/0x100
     ? apic_timer_interrupt+0xa/0x20
     ? ath5k_eeprom_read_pcal_info_2413+0x2f20/0x2f20 [ath5k]
     ath5k_hw_init+0xb60/0x1970 [ath5k]
     ath5k_init_ah+0x6fe/0x2530 [ath5k]
     ? kasprintf+0xa6/0xe0
     ? ath5k_stop+0x140/0x140 [ath5k]
     ? _dev_notice+0xf6/0xf6
     ? apic_timer_interrupt+0xa/0x20
     ath5k_pci_probe.cold+0x29a/0x3d6 [ath5k]
     ? ath5k_pci_eeprom_read+0x3c0/0x3c0 [ath5k]
     ? mutex_lock+0x89/0xd0
     ? ath5k_pci_eeprom_read+0x3c0/0x3c0 [ath5k]
     local_pci_probe+0xd3/0x160
     pci_device_probe+0x23f/0x3e0
     ? pci_device_remove+0x280/0x280
     ? pci_device_remove+0x280/0x280
     really_probe+0x209/0x5d0

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-2025-989089
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1f179600");
  # https://lore.kernel.org/linux-cve-announce/2025022646-CVE-2021-47633-ad15@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c0b86280");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-47633");
  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:U/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:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-47633");

  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:"2025/02/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}