Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100337)

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

include('compat.inc');

if (description)
{
  script_id(336102);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2023-53581");

  script_name(english:"Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100337)");

  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-2026-100337 advisory.

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

    net/mlx5e: Check for NOT_READY flag state after locking

    Currently the check for NOT_READY flag is performed before obtaining the
    necessary lock. This opens a possibility for race condition when the flow
    is concurrently removed from unready_flows list by the workqueue task,
    which causes a double-removal from the list and a crash[0]. Fix the issue
    by moving the flag check inside the section protected by
    uplink_priv->unready_flows_lock mutex.

    [0]:
    [44376.389654] general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1]
    SMP
    [44376.391665] CPU: 7 PID: 59123 Comm: tc Not tainted 6.4.0-rc4+ #1
    [44376.392984] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
    rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
    [44376.395342] RIP: 0010:mlx5e_tc_del_fdb_flow+0xb3/0x340 [mlx5_core]
    [44376.396857] Code: 00 48 8b b8 68 ce 02 00 e8 8a 4d 02 00 4c 8d a8 a8 01 00 00 4c 89 ef e8 8b 79 88 e1
    48 8b 83 98 06 00 00 48 8b 93 90 06 00 00 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 83 90
    06
    [44376.399167] RSP: 0018:ffff88812cc97570 EFLAGS: 00010246
    [44376.399680] RAX: dead000000000122 RBX: ffff8881088e3800 RCX: ffff8881881bac00
    [44376.400337] RDX: dead000000000100 RSI: ffff88812cc97500 RDI: ffff8881242f71b0
    [44376.401001] RBP: ffff88811cbb0940 R08: 0000000000000400 R09: 0000000000000001
    [44376.401663] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88812c944000
    [44376.402342] R13: ffff8881242f71a8 R14: ffff8881222b4000 R15: 0000000000000000
    [44376.402999] FS:  00007f0451104800(0000) GS:ffff88852cb80000(0000) knlGS:0000000000000000
    [44376.403787] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [44376.404343] CR2: 0000000000489108 CR3: 0000000123a79003 CR4: 0000000000370ea0
    [44376.405004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [44376.405665] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    [44376.406339] Call Trace:
    [44376.406651]  <TASK>
    [44376.406939]  ? die_addr+0x33/0x90
    [44376.407311]  ? exc_general_protection+0x192/0x390
    [44376.407795]  ? asm_exc_general_protection+0x22/0x30
    [44376.408292]  ? mlx5e_tc_del_fdb_flow+0xb3/0x340 [mlx5_core]
    [44376.408876]  __mlx5e_tc_del_fdb_peer_flow+0xbc/0xe0 [mlx5_core]
    [44376.409482]  mlx5e_tc_del_flow+0x42/0x210 [mlx5_core]
    [44376.410055]  mlx5e_flow_put+0x25/0x50 [mlx5_core]
    [44376.410529]  mlx5e_delete_flower+0x24b/0x350 [mlx5_core]
    [44376.411043]  tc_setup_cb_reoffload+0x22/0x80
    [44376.411462]  fl_reoffload+0x261/0x2f0 [cls_flower]
    [44376.411907]  ? mlx5e_rep_indr_setup_ft_cb+0x160/0x160 [mlx5_core]
    [44376.412481]  ? mlx5e_rep_indr_setup_ft_cb+0x160/0x160 [mlx5_core]
    [44376.413044]  tcf_block_playback_offloads+0x76/0x170
    [44376.413497]  tcf_block_unbind+0x7b/0xd0
    [44376.413881]  tcf_block_setup+0x17d/0x1c0
    [44376.414269]  tcf_block_offload_cmd.isra.0+0xf1/0x130
    [44376.414725]  tcf_block_offload_unbind+0x43/0x70
    [44376.415153]  __tcf_block_put+0x82/0x150
    [44376.415532]  ingress_destroy+0x22/0x30 [sch_ingress]
    [44376.415986]  qdisc_destroy+0x3b/0xd0
    [44376.416343]  qdisc_graft+0x4d0/0x620
    [44376.416706]  tc_get_qdisc+0x1c9/0x3b0
    [44376.417074]  rtnetlink_rcv_msg+0x29c/0x390
    [44376.419978]  ? rep_movs_alternative+0x3a/0xa0
    [44376.420399]  ? rtnl_calcit.isra.0+0x120/0x120
    [44376.420813]  netlink_rcv_skb+0x54/0x100
    [44376.421192]  netlink_unicast+0x1f6/0x2c0
    [44376.421573]  netlink_sendmsg+0x232/0x4a0
    [44376.421980]  sock_sendmsg+0x38/0x60
    [44376.422328]  ____sys_sendmsg+0x1d0/0x1e0
    [44376.422709]  ? copy_msghdr_from_user+0x6d/0xa0
    [44376.423127]  ___sys_sendmsg+0x80/0xc0
    [44376.423495]  ? ___sys_recvmsg+0x8b/0xc0
    [44376.423869]  __sys_sendmsg+0x51/0x90
    [44376.424226]  do_syscall_64+0x3d/0x90
    [44376.424587]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
    [44376.425046] RIP: 0033:0x7f045134f887
    [44376.425403] Code: 0a 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18
    00 00 00 85 c0 75 10 b8 2e 00
    ---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-2026-100337
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?589b2641");
  # https://lore.kernel.org/linux-cve-announce/2025100424-CVE-2023-53581-80fa@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?21caa195");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53581");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/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:H/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-2023-53581");

  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:"^20.1050a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050a', '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': '1050a',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', '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_NOTE,
      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');
}