Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-013238)

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

include('compat.inc');

if (description)
{
  script_id(308127);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2022-50549");

  script_name(english:"Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-013238)");

  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-2026-013238 advisory.

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

    dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata

    Following concurrent processes:

              P1(drop cache)                P2(kworker)
    drop_caches_sysctl_handler
     drop_slab
      shrink_slab
       down_read(&shrinker_rwsem)  - LOCK A
       do_shrink_slab
        super_cache_scan
         prune_icache_sb
          dispose_list
           evict
            ext4_evict_inode
             ext4_clear_inode
              ext4_discard_preallocations
               ext4_mb_load_buddy_gfp
                ext4_mb_init_cache
                 ext4_read_block_bitmap_nowait
                  ext4_read_bh_nowait
                   submit_bh
                    dm_submit_bio
                                     do_worker
                                      process_deferred_bios
                                       commit
                                        metadata_operation_failed
                                         dm_pool_abort_metadata
                                          down_write(&pmd->root_lock) - LOCK B
                                          __destroy_persistent_data_objects
                                           dm_block_manager_destroy
                                            dm_bufio_client_destroy
                                             unregister_shrinker
                                              down_write(&shrinker_rwsem)
                     thin_map                            |
                      dm_thin_find_block                 
                       down_read(&pmd->root_lock) --> ABBA deadlock

    , which triggers hung task:

    [   76.974820] INFO: task kworker/u4:3:63 blocked for more than 15 seconds.
    [   76.976019]       Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910
    [   76.978521] task:kworker/u4:3    state:D stack:0     pid:63    ppid:2
    [   76.978534] Workqueue: dm-thin do_worker
    [   76.978552] Call Trace:
    [   76.978564]  __schedule+0x6ba/0x10f0
    [   76.978582]  schedule+0x9d/0x1e0
    [   76.978588]  rwsem_down_write_slowpath+0x587/0xdf0
    [   76.978600]  down_write+0xec/0x110
    [   76.978607]  unregister_shrinker+0x2c/0xf0
    [   76.978616]  dm_bufio_client_destroy+0x116/0x3d0
    [   76.978625]  dm_block_manager_destroy+0x19/0x40
    [   76.978629]  __destroy_persistent_data_objects+0x5e/0x70
    [   76.978636]  dm_pool_abort_metadata+0x8e/0x100
    [   76.978643]  metadata_operation_failed+0x86/0x110
    [   76.978649]  commit+0x6a/0x230
    [   76.978655]  do_worker+0xc6e/0xd90
    [   76.978702]  process_one_work+0x269/0x630
    [   76.978714]  worker_thread+0x266/0x630
    [   76.978730]  kthread+0x151/0x1b0
    [   76.978772] INFO: task test.sh:2646 blocked for more than 15 seconds.
    [   76.979756]       Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910
    [   76.982111] task:test.sh         state:D stack:0     pid:2646  ppid:2459
    [   76.982128] Call Trace:
    [   76.982139]  __schedule+0x6ba/0x10f0
    [   76.982155]  schedule+0x9d/0x1e0
    [   76.982159]  rwsem_down_read_slowpath+0x4f4/0x910
    [   76.982173]  down_read+0x84/0x170
    [   76.982177]  dm_thin_find_block+0x4c/0xd0
    [   76.982183]  thin_map+0x201/0x3d0
    [   76.982188]  __map_bio+0x5b/0x350
    [   76.982195]  dm_submit_bio+0x2b6/0x930
    [   76.982202]  __submit_bio+0x123/0x2d0
    [   76.982209]  submit_bio_noacct_nocheck+0x101/0x3e0
    [   76.982222]  submit_bio_noacct+0x389/0x770
    [   76.982227]  submit_bio+0x50/0xc0
    [   76.982232]  submit_bh_wbc+0x15e/0x230
    [   76.982238]  submit_bh+0x14/0x20
    [   76.982241]  ext4_read_bh_nowait+0xc5/0x130
    [   76.982247]  ext4_read_block_bitmap_nowait+0x340/0xc60
    [   76.982254]  ext4_mb_init_cache+0x1ce/0xdc0
    [   76.982259]  ext4_mb_load_buddy_gfp+0x987/0xfa0
    [   76.982263]  ext4_discard_preallocations+0x45d/0x830
    [   76.982274]  ext4_clear_inode+0x48/0xf0
    [   76.982280]  ext4_evict_inode+0xcf/0xc70
    [   76.982285]  evict+0x119/0x2b0
    [   76.982290]  dispose_list+0x43/0xa0
    [   76.982294]  prune_icache_sb+0x64/0x90
    [   76.982298]  super_cache_scan+0x155/0x210
    [   76.982303]  do_shrink_slab+0x19e/0x4e0
    [   76.982310]  shrink_slab+0x2bd/0x450
    [   76.982317]  drop_slab+0xcc/0x1a0
    [   76.982323]  drop_caches_sysctl_handler+0xb7/0xe0
    [   76.982327]  proc_sys_call_handler+0x1bc/0x300
    [   76.982331]  proc_sys_write+0x17/0x20
    [   76.982334]  vfs_write+0x3d3/0x570
    [   76.982342]  ksys_write+0x73/0x160
    [   76.982347]  __x64_sys_write+0x1e/0x30
    [   76.982352]  do_syscall_64+0x35/0x80
    [   76.982357]  entry_SYSCALL_64_after_hwframe+0x63/0xcd

    Funct
    ---truncated---

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-2026-013238
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e9050f80");
  # https://lore.kernel.org/linux-cve-announce/2025100758-CVE-2022-50549-cb07@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f5435a24");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50549");
  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-2022-50549");

  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:"2021/07/21");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  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) 2026 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:"^20.1060e|20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060e / 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 && 'sw_64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2212.3.0', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2212.3.0', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2212.3.0', 'sp':'1060e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2212.3.0', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2212.3.0', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2212.3.0', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2212.3.0', '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');
}