Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987170)

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

include('compat.inc');

if (description)
{
  script_id(268516);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2023-52741");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987170)");

  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-2025-987170 advisory.

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

    cifs: Fix use-after-free in rdata->read_into_pages()

    When the network status is unstable, use-after-free may occur when
    read data from the server.

      BUG: KASAN: use-after-free in readpages_fill_pages+0x14c/0x7e0

      Call Trace:
       <TASK>
       dump_stack_lvl+0x38/0x4c
       print_report+0x16f/0x4a6
       kasan_report+0xb7/0x130
       readpages_fill_pages+0x14c/0x7e0
       cifs_readv_receive+0x46d/0xa40
       cifs_demultiplex_thread+0x121c/0x1490
       kthread+0x16b/0x1a0
       ret_from_fork+0x2c/0x50
       </TASK>

      Allocated by task 2535:
       kasan_save_stack+0x22/0x50
       kasan_set_track+0x25/0x30
       __kasan_kmalloc+0x82/0x90
       cifs_readdata_direct_alloc+0x2c/0x110
       cifs_readdata_alloc+0x2d/0x60
       cifs_readahead+0x393/0xfe0
       read_pages+0x12f/0x470
       page_cache_ra_unbounded+0x1b1/0x240
       filemap_get_pages+0x1c8/0x9a0
       filemap_read+0x1c0/0x540
       cifs_strict_readv+0x21b/0x240
       vfs_read+0x395/0x4b0
       ksys_read+0xb8/0x150
       do_syscall_64+0x3f/0x90
       entry_SYSCALL_64_after_hwframe+0x72/0xdc

      Freed by task 79:
       kasan_save_stack+0x22/0x50
       kasan_set_track+0x25/0x30
       kasan_save_free_info+0x2e/0x50
       __kasan_slab_free+0x10e/0x1a0
       __kmem_cache_free+0x7a/0x1a0
       cifs_readdata_release+0x49/0x60
       process_one_work+0x46c/0x760
       worker_thread+0x2a4/0x6f0
       kthread+0x16b/0x1a0
       ret_from_fork+0x2c/0x50

      Last potentially related work creation:
       kasan_save_stack+0x22/0x50
       __kasan_record_aux_stack+0x95/0xb0
       insert_work+0x2b/0x130
       __queue_work+0x1fe/0x660
       queue_work_on+0x4b/0x60
       smb2_readv_callback+0x396/0x800
       cifs_abort_connection+0x474/0x6a0
       cifs_reconnect+0x5cb/0xa50
       cifs_readv_from_socket.cold+0x22/0x6c
       cifs_read_page_from_socket+0xc1/0x100
       readpages_fill_pages.cold+0x2f/0x46
       cifs_readv_receive+0x46d/0xa40
       cifs_demultiplex_thread+0x121c/0x1490
       kthread+0x16b/0x1a0
       ret_from_fork+0x2c/0x50

    The following function calls will cause UAF of the rdata pointer.

    readpages_fill_pages
     cifs_read_page_from_socket
      cifs_readv_from_socket
       cifs_reconnect
        __cifs_reconnect
         cifs_abort_connection
          mid->callback() --> smb2_readv_callback
           queue_work(&rdata->work)  # if the worker completes first,
                                     # the rdata is freed
              cifs_readv_complete
                kref_put
                  cifs_readdata_release
                    kfree(rdata)
     return rdata->...               # UAF in readpages_fill_pages()

    Similarly, this problem also occurs in the uncache_fill_pages().

    Fix this by adjusts the order of condition judgment in the return
    statement.

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-2025-987170
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?08846548");
  # https://lore.kernel.org/linux-cve-announce/2024052102-CVE-2023-52741-6a1e@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?52ebaaa9");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-52741");
  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:C/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-2023-52741");

  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:"2023/03/22");
  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');
}