Unity Linux 20.1070e Security Update: kernel (UTSA-2026-131744)

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

include('compat.inc');

if (description)
{
  script_id(366555);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/16");

  script_cve_id("CVE-2026-43329");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-131744)");

  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-2026-131744 advisory.

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

    netfilter: flowtable: strictly check for maximum number of actions

    The maximum number of flowtable hardware offload actions in IPv6 is:

    * ethernet mangling (4 payload actions, 2 for each ethernet address)
    * SNAT (4 payload actions)
    * DNAT (4 payload actions)
    * Double VLAN (4 vlan actions, 2 for popping vlan, and 2 for pushing)
      for QinQ.
    * Redirect (1 action)

    Which makes 17, while the maximum is 16. But act_ct supports for tunnels
    actions too. Note that payload action operates at 32-bit word level, so
    mangling an IPv6 address takes 4 payload actions.

    Update flow_action_entry_next() calls to check for the maximum number of
    supported actions.

    While at it, rise the maximum number of actions per flow from 16 to 24
    so this works fine with IPv6 setups.

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-2026-131744
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c2fd4809");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:23329");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:26427");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:26428");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:27713");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:30848");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:33215");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:33899");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:33900");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:34094");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:34095");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:35863");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:35896");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/errata/RHSA-2026:40764");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2026-43329");
  script_set_attribute(attribute:"see_also", value:"https://bugzilla.redhat.com/show_bug.cgi?id=2468124");
  # https://git.kernel.org/stable/c/504c9456699dcf4d15195ef34a0fa94a80bfc877
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e4d6faeb");
  # https://git.kernel.org/stable/c/5382bb03e9c33b089d60788478b922a2dca284cc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?919880a2");
  # https://git.kernel.org/stable/c/57c78bd2e2dd08897acd35b2bf8bcef322e36f5e
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?31c1305f");
  # https://git.kernel.org/stable/c/76522fcdbc3a02b568f5d957f7e66fc194abb893
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?56c7b401");
  # https://git.kernel.org/stable/c/879959a7a2be814dd57568655eafa3d8f4d0309e
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?490c0748");
  # https://git.kernel.org/stable/c/ead66c77303f760f6c30be96e2e20d5a77cef614
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2be0ace6");
  # https://git.kernel.org/stable/c/fe9018d3e94329f1951b00805a8640bc06f56ead
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e0b9ad36");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-43329");
  # https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43329.json
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4e116542");
  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-2026-43329");

  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:"2026/05/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/16");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/16");

  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:"^(20.1070e)([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.26.uel20', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.26.uel20', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.26.uel20', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.26.uel20', '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');
}