Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987343)

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

include('compat.inc');

if (description)
{
  script_id(268580);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2023-53023");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987343)");

  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-2025-987343 advisory.

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

    net: nfc: Fix use-after-free in local_cleanup()

    Fix a use-after-free that occurs in kfree_skb() called from
    local_cleanup(). This could happen when killing nfc daemon (e.g. neard)
    after detaching an nfc device.
    When detaching an nfc device, local_cleanup() called from
    nfc_llcp_unregister_device() frees local->rx_pending and decreases
    local->ref by kref_put() in nfc_llcp_local_put().
    In the terminating process, nfc daemon releases all sockets and it leads
    to decreasing local->ref. After the last release of local->ref,
    local_cleanup() called from local_release() frees local->rx_pending
    again, which leads to the bug.

    Setting local->rx_pending to NULL in local_cleanup() could prevent
    use-after-free when local_cleanup() is called twice.

    Found by a modified version of syzkaller.

    BUG: KASAN: use-after-free in kfree_skb()

    Call Trace:
    dump_stack_lvl (lib/dump_stack.c:106)
    print_address_description.constprop.0.cold (mm/kasan/report.c:306)
    kasan_check_range (mm/kasan/generic.c:189)
    kfree_skb (net/core/skbuff.c:955)
    local_cleanup (net/nfc/llcp_core.c:159)
    nfc_llcp_local_put.part.0 (net/nfc/llcp_core.c:172)
    nfc_llcp_local_put (net/nfc/llcp_core.c:181)
    llcp_sock_destruct (net/nfc/llcp_sock.c:959)
    __sk_destruct (net/core/sock.c:2133)
    sk_destruct (net/core/sock.c:2181)
    __sk_free (net/core/sock.c:2192)
    sk_free (net/core/sock.c:2203)
    llcp_sock_release (net/nfc/llcp_sock.c:646)
    __sock_release (net/socket.c:650)
    sock_close (net/socket.c:1365)
    __fput (fs/file_table.c:306)
    task_work_run (kernel/task_work.c:179)
    ptrace_notify (kernel/signal.c:2354)
    syscall_exit_to_user_mode_prepare (kernel/entry/common.c:278)
    syscall_exit_to_user_mode (kernel/entry/common.c:296)
    do_syscall_64 (arch/x86/entry/common.c:86)
    entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:106)

    Allocated by task 4719:
    kasan_save_stack (mm/kasan/common.c:45)
    __kasan_slab_alloc (mm/kasan/common.c:325)
    slab_post_alloc_hook (mm/slab.h:766)
    kmem_cache_alloc_node (mm/slub.c:3497)
    __alloc_skb (net/core/skbuff.c:552)
    pn533_recv_response (drivers/nfc/pn533/usb.c:65)
    __usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1671)
    usb_giveback_urb_bh (drivers/usb/core/hcd.c:1704)
    tasklet_action_common.isra.0 (kernel/softirq.c:797)
    __do_softirq (kernel/softirq.c:571)

    Freed by task 1901:
    kasan_save_stack (mm/kasan/common.c:45)
    kasan_set_track (mm/kasan/common.c:52)
    kasan_save_free_info (mm/kasan/genericdd.c:518)
    __kasan_slab_free (mm/kasan/common.c:236)
    kmem_cache_free (mm/slub.c:3809)
    kfree_skbmem (net/core/skbuff.c:874)
    kfree_skb (net/core/skbuff.c:931)
    local_cleanup (net/nfc/llcp_core.c:159)
    nfc_llcp_unregister_device (net/nfc/llcp_core.c:1617)
    nfc_unregister_device (net/nfc/core.c:1179)
    pn53x_unregister_nfc (drivers/nfc/pn533/pn533.c:2846)
    pn533_usb_disconnect (drivers/nfc/pn533/usb.c:579)
    usb_unbind_interface (drivers/usb/core/driver.c:458)
    device_release_driver_internal (drivers/base/dd.c:1279)
    bus_remove_device (drivers/base/bus.c:529)
    device_del (drivers/base/core.c:3665)
    usb_disable_device (drivers/usb/core/message.c:1420)
    usb_disconnect (drivers/usb/core.c:2261)
    hub_event (drivers/usb/core/hub.c:5833)
    process_one_work (arch/x86/include/asm/jump_label.h:27 include/linux/jump_label.h:212
    include/trace/events/workqueue.h:108 kernel/workqueue.c:2281)
    worker_thread (include/linux/list.h:282 kernel/workqueue.c:2423)
    kthread (kernel/kthread.c:319)
    ret_from_fork (arch/x86/entry/entry_64.S:301)

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-2025-987343
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6972f4a7");
  # https://lore.kernel.org/linux-cve-announce/2025032718-CVE-2023-53023-ef4e@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?eeff2b5a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53023");
  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:H/I:H/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-2023-53023");

  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:"2025/03/27");
  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');
}