Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986944)

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

include('compat.inc');

if (description)
{
  script_id(268679);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2021-47237");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986944)");

  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-2025-986944 advisory.

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

    net: hamradio: fix memory leak in mkiss_close

    My local syzbot instance hit memory leak in
    mkiss_open()[1]. The problem was in missing
    free_netdev() in mkiss_close().

    In mkiss_open() netdevice is allocated and then
    registered, but in mkiss_close() netdevice was
    only unregistered, but not freed.

    Fail log:

    BUG: memory leak
    unreferenced object 0xffff8880281ba000 (size 4096):
      comm syz-executor.1, pid 11443, jiffies 4295046091 (age 17.660s)
      hex dump (first 32 bytes):
        61 78 30 00 00 00 00 00 00 00 00 00 00 00 00 00  ax0.............
        00 27 fa 2a 80 88 ff ff 00 00 00 00 00 00 00 00  .'.*............
      backtrace:
        [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0
        [<ffffffff8706e7e8>] alloc_netdev_mqs+0x98/0xe80
        [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
        [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
        [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
        [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
        [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
        [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
        [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

    BUG: memory leak
    unreferenced object 0xffff8880141a9a00 (size 96):
      comm syz-executor.1, pid 11443, jiffies 4295046091 (age 17.660s)
      hex dump (first 32 bytes):
        e8 a2 1b 28 80 88 ff ff e8 a2 1b 28 80 88 ff ff  ...(.......(....
        98 92 9c aa b0 40 02 00 00 00 00 00 00 00 00 00  .....@..........
      backtrace:
        [<ffffffff8709f68b>] __hw_addr_create_ex+0x5b/0x310
        [<ffffffff8709fb38>] __hw_addr_add_ex+0x1f8/0x2b0
        [<ffffffff870a0c7b>] dev_addr_init+0x10b/0x1f0
        [<ffffffff8706e88b>] alloc_netdev_mqs+0x13b/0xe80
        [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
        [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
        [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
        [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
        [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
        [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
        [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

    BUG: memory leak
    unreferenced object 0xffff8880219bfc00 (size 512):
      comm syz-executor.1, pid 11443, jiffies 4295046091 (age 17.660s)
      hex dump (first 32 bytes):
        00 a0 1b 28 80 88 ff ff 80 8f b1 8d ff ff ff ff  ...(............
        80 8f b1 8d ff ff ff ff 00 00 00 00 00 00 00 00  ................
      backtrace:
        [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0
        [<ffffffff8706eec7>] alloc_netdev_mqs+0x777/0xe80
        [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
        [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
        [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
        [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
        [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
        [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
        [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

    BUG: memory leak
    unreferenced object 0xffff888029b2b200 (size 256):
      comm syz-executor.1, pid 11443, jiffies 4295046091 (age 17.660s)
      hex dump (first 32 bytes):
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
        00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
      backtrace:
        [<ffffffff81a27201>] kvmalloc_node+0x61/0xf0
        [<ffffffff8706f062>] alloc_netdev_mqs+0x912/0xe80
        [<ffffffff84e64192>] mkiss_open+0xb2/0x6f0 [1]
        [<ffffffff842355db>] tty_ldisc_open+0x9b/0x110
        [<ffffffff84236488>] tty_set_ldisc+0x2e8/0x670
        [<ffffffff8421f7f3>] tty_ioctl+0xda3/0x1440
        [<ffffffff81c9f273>] __x64_sys_ioctl+0x193/0x200
        [<ffffffff8911263a>] do_syscall_64+0x3a/0xb0
        [<ffffffff89200068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

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-2025-986944
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5c1d1706");
  # https://lore.kernel.org/linux-cve-announce/2024052140-CVE-2021-47237-52cf@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?60c70135");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-47237");
  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-2021-47237");

  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:"2024/05/21");
  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');
}