Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005771)

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

include('compat.inc');

if (description)
{
  script_id(300311);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/03");

  script_cve_id("CVE-2023-53492");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005771)");

  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-2026-005771 advisory.

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

    netfilter: nf_tables: do not ignore genmask when looking up chain by id

    When adding a rule to a chain referring to its ID, if that chain had been
    deleted on the same batch, the rule might end up referring to a deleted
    chain.

    This will lead to a WARNING like following:

    [   33.098431] ------------[ cut here ]------------
    [   33.098678] WARNING: CPU: 5 PID: 69 at net/netfilter/nf_tables_api.c:2037
    nf_tables_chain_destroy+0x23d/0x260
    [   33.099217] Modules linked in:
    [   33.099388] CPU: 5 PID: 69 Comm: kworker/5:1 Not tainted 6.4.0+ #409
    [   33.099726] Workqueue: events nf_tables_trans_destroy_work
    [   33.100018] RIP: 0010:nf_tables_chain_destroy+0x23d/0x260
    [   33.100306] Code: 8b 7c 24 68 e8 64 9c ed fe 4c 89 e7 e8 5c 9c ed fe 48 83 c4 08 5b 41 5c 41 5d 41 5e
    41 5f 5d 31 c0 89 c6 89 c7 c3 cc cc cc cc <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d 31 c0 89 c6 89
    c7
    [   33.101271] RSP: 0018:ffffc900004ffc48 EFLAGS: 00010202
    [   33.101546] RAX: 0000000000000001 RBX: ffff888006fc0a28 RCX: 0000000000000000
    [   33.101920] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
    [   33.102649] RBP: ffffc900004ffc78 R08: 0000000000000000 R09: 0000000000000000
    [   33.103018] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880135ef500
    [   33.103385] R13: 0000000000000000 R14: dead000000000122 R15: ffff888006fc0a10
    [   33.103762] FS:  0000000000000000(0000) GS:ffff888024c80000(0000) knlGS:0000000000000000
    [   33.104184] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [   33.104493] CR2: 00007fe863b56a50 CR3: 00000000124b0001 CR4: 0000000000770ee0
    [   33.104872] PKRU: 55555554
    [   33.104999] Call Trace:
    [   33.105113]  <TASK>
    [   33.105214]  ? show_regs+0x72/0x90
    [   33.105371]  ? __warn+0xa5/0x210
    [   33.105520]  ? nf_tables_chain_destroy+0x23d/0x260
    [   33.105732]  ? report_bug+0x1f2/0x200
    [   33.105902]  ? handle_bug+0x46/0x90
    [   33.106546]  ? exc_invalid_op+0x19/0x50
    [   33.106762]  ? asm_exc_invalid_op+0x1b/0x20
    [   33.106995]  ? nf_tables_chain_destroy+0x23d/0x260
    [   33.107249]  ? nf_tables_chain_destroy+0x30/0x260
    [   33.107506]  nf_tables_trans_destroy_work+0x669/0x680
    [   33.107782]  ? mark_held_locks+0x28/0xa0
    [   33.107996]  ? __pfx_nf_tables_trans_destroy_work+0x10/0x10
    [   33.108294]  ? _raw_spin_unlock_irq+0x28/0x70
    [   33.108538]  process_one_work+0x68c/0xb70
    [   33.108755]  ? lock_acquire+0x17f/0x420
    [   33.108977]  ? __pfx_process_one_work+0x10/0x10
    [   33.109218]  ? do_raw_spin_lock+0x128/0x1d0
    [   33.109435]  ? _raw_spin_lock_irq+0x71/0x80
    [   33.109634]  worker_thread+0x2bd/0x700
    [   33.109817]  ? __pfx_worker_thread+0x10/0x10
    [   33.110254]  kthread+0x18b/0x1d0
    [   33.110410]  ? __pfx_kthread+0x10/0x10
    [   33.110581]  ret_from_fork+0x29/0x50
    [   33.110757]  </TASK>
    [   33.110866] irq event stamp: 1651
    [   33.111017] hardirqs last  enabled at (1659): [<ffffffffa206a209>] __up_console_sem+0x79/0xa0
    [   33.111379] hardirqs last disabled at (1666): [<ffffffffa206a1ee>] __up_console_sem+0x5e/0xa0
    [   33.111740] softirqs last  enabled at (1616): [<ffffffffa1f5d40e>] __irq_exit_rcu+0x9e/0xe0
    [   33.112094] softirqs last disabled at (1367): [<ffffffffa1f5d40e>] __irq_exit_rcu+0x9e/0xe0
    [   33.112453] ---[ end trace 0000000000000000 ]---

    This is due to the nft_chain_lookup_byid ignoring the genmask. After this
    change, adding the new rule will fail as it will not find the chain.

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-2026-005771
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ec909865");
  # https://lore.kernel.org/linux-cve-announce/2025100124-CVE-2023-53492-18fd@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?467fd1ce");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53492");
  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-2023-53492");

  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:"2026/03/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/03");

  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:"^20.1070a([^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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', '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');
}