Unity Linux 20.1070a Security Update: kernel (UTSA-2025-992809)

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

include('compat.inc');

if (description)
{
  script_id(280893);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2023-53427");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-992809)");

  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-2025-992809 advisory.

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

    cifs: Fix warning and UAF when destroy the MR list

    If the MR allocate failed, the MR recovery work not initialized
    and list not cleared. Then will be warning and UAF when release
    the MR:

      WARNING: CPU: 4 PID: 824 at kernel/workqueue.c:3066 __flush_work.isra.0+0xf7/0x110
      CPU: 4 PID: 824 Comm: mount.cifs Not tainted 6.1.0-rc5+ #82
      RIP: 0010:__flush_work.isra.0+0xf7/0x110
      Call Trace:
       <TASK>
       __cancel_work_timer+0x2ba/0x2e0
       smbd_destroy+0x4e1/0x990
       _smbd_get_connection+0x1cbd/0x2110
       smbd_get_connection+0x21/0x40
       cifs_get_tcp_session+0x8ef/0xda0
       mount_get_conns+0x60/0x750
       cifs_mount+0x103/0xd00
       cifs_smb3_do_mount+0x1dd/0xcb0
       smb3_get_tree+0x1d5/0x300
       vfs_get_tree+0x41/0xf0
       path_mount+0x9b3/0xdd0
       __x64_sys_mount+0x190/0x1d0
       do_syscall_64+0x35/0x80
       entry_SYSCALL_64_after_hwframe+0x46/0xb0

      BUG: KASAN: use-after-free in smbd_destroy+0x4fc/0x990
      Read of size 8 at addr ffff88810b156a08 by task mount.cifs/824
      CPU: 4 PID: 824 Comm: mount.cifs Tainted: G        W          6.1.0-rc5+ #82
      Call Trace:
       dump_stack_lvl+0x34/0x44
       print_report+0x171/0x472
       kasan_report+0xad/0x130
       smbd_destroy+0x4fc/0x990
       _smbd_get_connection+0x1cbd/0x2110
       smbd_get_connection+0x21/0x40
       cifs_get_tcp_session+0x8ef/0xda0
       mount_get_conns+0x60/0x750
       cifs_mount+0x103/0xd00
       cifs_smb3_do_mount+0x1dd/0xcb0
       smb3_get_tree+0x1d5/0x300
       vfs_get_tree+0x41/0xf0
       path_mount+0x9b3/0xdd0
       __x64_sys_mount+0x190/0x1d0
       do_syscall_64+0x35/0x80
       entry_SYSCALL_64_after_hwframe+0x46/0xb0

      Allocated by task 824:
       kasan_save_stack+0x1e/0x40
       kasan_set_track+0x21/0x30
       __kasan_kmalloc+0x7a/0x90
       _smbd_get_connection+0x1b6f/0x2110
       smbd_get_connection+0x21/0x40
       cifs_get_tcp_session+0x8ef/0xda0
       mount_get_conns+0x60/0x750
       cifs_mount+0x103/0xd00
       cifs_smb3_do_mount+0x1dd/0xcb0
       smb3_get_tree+0x1d5/0x300
       vfs_get_tree+0x41/0xf0
       path_mount+0x9b3/0xdd0
       __x64_sys_mount+0x190/0x1d0
       do_syscall_64+0x35/0x80
       entry_SYSCALL_64_after_hwframe+0x46/0xb0

      Freed by task 824:
       kasan_save_stack+0x1e/0x40
       kasan_set_track+0x21/0x30
       kasan_save_free_info+0x2a/0x40
       ____kasan_slab_free+0x143/0x1b0
       __kmem_cache_free+0xc8/0x330
       _smbd_get_connection+0x1c6a/0x2110
       smbd_get_connection+0x21/0x40
       cifs_get_tcp_session+0x8ef/0xda0
       mount_get_conns+0x60/0x750
       cifs_mount+0x103/0xd00
       cifs_smb3_do_mount+0x1dd/0xcb0
       smb3_get_tree+0x1d5/0x300
       vfs_get_tree+0x41/0xf0
       path_mount+0x9b3/0xdd0
       __x64_sys_mount+0x190/0x1d0
       do_syscall_64+0x35/0x80
       entry_SYSCALL_64_after_hwframe+0x46/0xb0

    Let's initialize the MR recovery work before MR allocate to prevent
    the warning, remove the MRs from the list to prevent the UAF.

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-2025-992809
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?94d1cae2");
  # https://lore.kernel.org/linux-cve-announce/2025091856-CVE-2023-53427-f56c@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?59b449dc");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53427");
  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-2023-53427");

  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:"2021/09/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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-4.19.0-91.82.190.005', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.190.005', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.190.005', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.0-91.82.190.005', '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');
}