Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987256)

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

include('compat.inc');

if (description)
{
  script_id(268235);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2022-48914");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987256)");

  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-2025-987256 advisory.

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

    xen/netfront: destroy queues before real_num_tx_queues is zeroed

    xennet_destroy_queues() relies on info->netdev->real_num_tx_queues to
    delete queues. Since d7dac083414eb5bb99a6d2ed53dc2c1b405224e5
    (net-sysfs: update the queue counts in the unregistration path),
    unregister_netdev() indirectly sets real_num_tx_queues to 0. Those two
    facts together means, that xennet_destroy_queues() called from
    xennet_remove() cannot do its job, because it's called after
    unregister_netdev(). This results in kfree-ing queues that are still
    linked in napi, which ultimately crashes:

        BUG: kernel NULL pointer dereference, address: 0000000000000000
        #PF: supervisor read access in kernel mode
        #PF: error_code(0x0000) - not-present page
        PGD 0 P4D 0
        Oops: 0000 [#1] PREEMPT SMP PTI
        CPU: 1 PID: 52 Comm: xenwatch Tainted: G        W         5.16.10-1.32.fc32.qubes.x86_64+ #226
        RIP: 0010:free_netdev+0xa3/0x1a0
        Code: ff 48 89 df e8 2e e9 00 00 48 8b 43 50 48 8b 08 48 8d b8 a0 fe ff ff 48 8d a9 a0 fe ff ff 49 39
    c4 75 26 eb 47 e8 ed c1 66 ff <48> 8b 85 60 01 00 00 48 8d 95 60 01 00 00 48 89 ef 48 2d 60 01 00
        RSP: 0000:ffffc90000bcfd00 EFLAGS: 00010286
        RAX: 0000000000000000 RBX: ffff88800edad000 RCX: 0000000000000000
        RDX: 0000000000000001 RSI: ffffc90000bcfc30 RDI: 00000000ffffffff
        RBP: fffffffffffffea0 R08: 0000000000000000 R09: 0000000000000000
        R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800edad050
        R13: ffff8880065f8f88 R14: 0000000000000000 R15: ffff8880066c6680
        FS:  0000000000000000(0000) GS:ffff8880f3300000(0000) knlGS:0000000000000000
        CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
        CR2: 0000000000000000 CR3: 00000000e998c006 CR4: 00000000003706e0
        Call Trace:
         <TASK>
         xennet_remove+0x13d/0x300 [xen_netfront]
         xenbus_dev_remove+0x6d/0xf0
         __device_release_driver+0x17a/0x240
         device_release_driver+0x24/0x30
         bus_remove_device+0xd8/0x140
         device_del+0x18b/0x410
         ? _raw_spin_unlock+0x16/0x30
         ? klist_iter_exit+0x14/0x20
         ? xenbus_dev_request_and_reply+0x80/0x80
         device_unregister+0x13/0x60
         xenbus_dev_changed+0x18e/0x1f0
         xenwatch_thread+0xc0/0x1a0
         ? do_wait_intr_irq+0xa0/0xa0
         kthread+0x16b/0x190
         ? set_kthread_struct+0x40/0x40
         ret_from_fork+0x22/0x30
         </TASK>

    Fix this by calling xennet_destroy_queues() from xennet_uninit(),
    when real_num_tx_queues is still available. This ensures that queues are
    destroyed when real_num_tx_queues is set to 0, regardless of how
    unregister_netdev() was called.

    Originally reported at
    https://github.com/QubesOS/qubes-issues/issues/7257

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-2025-987256
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4cede083");
  # https://lore.kernel.org/linux-cve-announce/2024082216-CVE-2022-48914-97e1@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a6daccce");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48914");
  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-2022-48914");

  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:"2022/04/07");
  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');
}