Unity Linux 20.1070a Security Update: kernel (UTSA-2025-990063)

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

include('compat.inc');

if (description)
{
  script_id(272559);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2023-52803");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-990063)");

  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-2025-990063 advisory.

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

    SUNRPC: Fix RPC client cleaned up the freed pipefs dentries

    RPC client pipefs dentries cleanup is in separated rpc_remove_pipedir()
    workqueue,which takes care about pipefs superblock locking.
    In some special scenarios, when kernel frees the pipefs sb of the
    current client and immediately alloctes a new pipefs sb,
    rpc_remove_pipedir function would misjudge the existence of pipefs
    sb which is not the one it used to hold. As a result,
    the rpc_remove_pipedir would clean the released freed pipefs dentries.

    To fix this issue, rpc_remove_pipedir should check whether the
    current pipefs sb is consistent with the original pipefs sb.

    This error can be catched by KASAN:
    =========================================================
    [  250.497700] BUG: KASAN: slab-use-after-free in dget_parent+0x195/0x200
    [  250.498315] Read of size 4 at addr ffff88800a2ab804 by task kworker/0:18/106503
    [  250.500549] Workqueue: events rpc_free_client_work
    [  250.501001] Call Trace:
    [  250.502880]  kasan_report+0xb6/0xf0
    [  250.503209]  ? dget_parent+0x195/0x200
    [  250.503561]  dget_parent+0x195/0x200
    [  250.503897]  ? __pfx_rpc_clntdir_depopulate+0x10/0x10
    [  250.504384]  rpc_rmdir_depopulate+0x1b/0x90
    [  250.504781]  rpc_remove_client_dir+0xf5/0x150
    [  250.505195]  rpc_free_client_work+0xe4/0x230
    [  250.505598]  process_one_work+0x8ee/0x13b0
    ...
    [   22.039056] Allocated by task 244:
    [   22.039390]  kasan_save_stack+0x22/0x50
    [   22.039758]  kasan_set_track+0x25/0x30
    [   22.040109]  __kasan_slab_alloc+0x59/0x70
    [   22.040487]  kmem_cache_alloc_lru+0xf0/0x240
    [   22.040889]  __d_alloc+0x31/0x8e0
    [   22.041207]  d_alloc+0x44/0x1f0
    [   22.041514]  __rpc_lookup_create_exclusive+0x11c/0x140
    [   22.041987]  rpc_mkdir_populate.constprop.0+0x5f/0x110
    [   22.042459]  rpc_create_client_dir+0x34/0x150
    [   22.042874]  rpc_setup_pipedir_sb+0x102/0x1c0
    [   22.043284]  rpc_client_register+0x136/0x4e0
    [   22.043689]  rpc_new_client+0x911/0x1020
    [   22.044057]  rpc_create_xprt+0xcb/0x370
    [   22.044417]  rpc_create+0x36b/0x6c0
    ...
    [   22.049524] Freed by task 0:
    [   22.049803]  kasan_save_stack+0x22/0x50
    [   22.050165]  kasan_set_track+0x25/0x30
    [   22.050520]  kasan_save_free_info+0x2b/0x50
    [   22.050921]  __kasan_slab_free+0x10e/0x1a0
    [   22.051306]  kmem_cache_free+0xa5/0x390
    [   22.051667]  rcu_core+0x62c/0x1930
    [   22.051995]  __do_softirq+0x165/0x52a
    [   22.052347]
    [   22.052503] Last potentially related work creation:
    [   22.052952]  kasan_save_stack+0x22/0x50
    [   22.053313]  __kasan_record_aux_stack+0x8e/0xa0
    [   22.053739]  __call_rcu_common.constprop.0+0x6b/0x8b0
    [   22.054209]  dentry_free+0xb2/0x140
    [   22.054540]  __dentry_kill+0x3be/0x540
    [   22.054900]  shrink_dentry_list+0x199/0x510
    [   22.055293]  shrink_dcache_parent+0x190/0x240
    [   22.055703]  do_one_tree+0x11/0x40
    [   22.056028]  shrink_dcache_for_umount+0x61/0x140
    [   22.056461]  generic_shutdown_super+0x70/0x590
    [   22.056879]  kill_anon_super+0x3a/0x60
    [   22.057234]  rpc_kill_sb+0x121/0x200

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-2025-990063
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?764c15d1");
  # https://lore.kernel.org/linux-cve-announce/2024052100-CVE-2023-52803-1f43@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?47871b8d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-52803");
  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-2023-52803");

  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:"2023/12/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}