Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099922)

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

include('compat.inc');

if (description)
{
  script_id(336437);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2023-53556");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099922)");

  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-2026-099922 advisory.

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

    iavf: Fix use-after-free in free_netdev

    We do netif_napi_add() for all allocated q_vectors[], but potentially
    do netif_napi_del() for part of them, then kfree q_vectors and leave
    invalid pointers at dev->napi_list.

    Reproducer:

      [root@host ~]# cat repro.sh
      #!/bin/bash

      pf_dbsf=0000:41:00.0
      vf0_dbsf=0000:41:02.0
      g_pids=()

      function do_set_numvf()
      {
          echo 2 >/sys/bus/pci/devices/${pf_dbsf}/sriov_numvfs
          sleep $((RANDOM%3+1))
          echo 0 >/sys/bus/pci/devices/${pf_dbsf}/sriov_numvfs
          sleep $((RANDOM%3+1))
      }

      function do_set_channel()
      {
          local nic=$(ls -1 --indicator-style=none /sys/bus/pci/devices/${vf0_dbsf}/net/)
          [ -z $nic ] && { sleep $((RANDOM%3)) ; return 1; }
          ifconfig $nic 192.168.18.5 netmask 255.255.255.0
          ifconfig $nic up
          ethtool -L $nic combined 1
          ethtool -L $nic combined 4
          sleep $((RANDOM%3))
      }

      function on_exit()
      {
          local pid
          for pid in ${g_pids[@]}; do
              kill -0 $pid &>/dev/null && kill $pid &>/dev/null
          done
          g_pids=()
      }

      trap on_exit; exit EXIT

      while :; do do_set_numvf ; done &
      g_pids+=($!)
      while :; do do_set_channel ; done &
      g_pids+=($!)

      wait

    Result:

    [ 4093.900222] ==================================================================
    [ 4093.900230] BUG: KASAN: use-after-free in free_netdev+0x308/0x390
    [ 4093.900232] Read of size 8 at addr ffff88b4dc145640 by task repro.sh/6699
    [ 4093.900233]
    [ 4093.900236] CPU: 10 PID: 6699 Comm: repro.sh Kdump: loaded Tainted: G           O     --------- -t -
    4.18.0 #1
    [ 4093.900238] Hardware name: Powerleader PR2008AL/H12DSi-N6, BIOS 2.0 04/09/2021
    [ 4093.900239] Call Trace:
    [ 4093.900244]  dump_stack+0x71/0xab
    [ 4093.900249]  print_address_description+0x6b/0x290
    [ 4093.900251]  ? free_netdev+0x308/0x390
    [ 4093.900252]  kasan_report+0x14a/0x2b0
    [ 4093.900254]  free_netdev+0x308/0x390
    [ 4093.900261]  iavf_remove+0x825/0xd20 [iavf]
    [ 4093.900265]  pci_device_remove+0xa8/0x1f0
    [ 4093.900268]  device_release_driver_internal+0x1c6/0x460
    [ 4093.900271]  pci_stop_bus_device+0x101/0x150
    [ 4093.900273]  pci_stop_and_remove_bus_device+0xe/0x20
    [ 4093.900275]  pci_iov_remove_virtfn+0x187/0x420
    [ 4093.900277]  ? pci_iov_add_virtfn+0xe10/0xe10
    [ 4093.900278]  ? pci_get_subsys+0x90/0x90
    [ 4093.900280]  sriov_disable+0xed/0x3e0
    [ 4093.900282]  ? bus_find_device+0x12d/0x1a0
    [ 4093.900290]  i40e_free_vfs+0x754/0x1210 [i40e]
    [ 4093.900298]  ? i40e_reset_all_vfs+0x880/0x880 [i40e]
    [ 4093.900299]  ? pci_get_device+0x7c/0x90
    [ 4093.900300]  ? pci_get_subsys+0x90/0x90
    [ 4093.900306]  ? pci_vfs_assigned.part.7+0x144/0x210
    [ 4093.900309]  ? __mutex_lock_slowpath+0x10/0x10
    [ 4093.900315]  i40e_pci_sriov_configure+0x1fa/0x2e0 [i40e]
    [ 4093.900318]  sriov_numvfs_store+0x214/0x290
    [ 4093.900320]  ? sriov_totalvfs_show+0x30/0x30
    [ 4093.900321]  ? __mutex_lock_slowpath+0x10/0x10
    [ 4093.900323]  ? __check_object_size+0x15a/0x350
    [ 4093.900326]  kernfs_fop_write+0x280/0x3f0
    [ 4093.900329]  vfs_write+0x145/0x440
    [ 4093.900330]  ksys_write+0xab/0x160
    [ 4093.900332]  ? __ia32_sys_read+0xb0/0xb0
    [ 4093.900334]  ? fput_many+0x1a/0x120
    [ 4093.900335]  ? filp_close+0xf0/0x130
    [ 4093.900338]  do_syscall_64+0xa0/0x370
    [ 4093.900339]  ? page_fault+0x8/0x30
    [ 4093.900341]  entry_SYSCALL_64_after_hwframe+0x65/0xca
    [ 4093.900357] RIP: 0033:0x7f16ad4d22c0
    [ 4093.900359] Code: 73 01 c3 48 8b 0d d8 cb 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d
    89 24 2d 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 fe dd 01 00 48 89 04
    24
    [ 4093.900360] RSP: 002b:00007ffd6491b7f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
    [ 4093.900362] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f16ad4d22c0
    [ 4093.900363] RDX: 0000000000000002 RSI: 0000000001a41408 RDI: 0000000000000001
    [ 4093.900364] RBP: 0000000001a41408 R08: 00007f16ad7a1780 R09: 00007f16ae1f2700
    [ 4093.9003
    ---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-2026-099922
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1a56b3a7");
  # https://lore.kernel.org/linux-cve-announce/2025100448-CVE-2023-53556-db4c@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8a68d47e");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53556");
  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-2023-53556");

  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:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/17");

  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:"^20.1050e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e', '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': '1050e',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', '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');
}