Unity Linux 20.1070a Security Update: kernel (UTSA-2026-143124)

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

include('compat.inc');

if (description)
{
  script_id(370641);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/22");

  script_cve_id("CVE-2026-46043");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-143124)");

  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-2026-143124 advisory.

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

    RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv

    rxe_rcv() currently checks only that the incoming packet is at least
    header_size(pkt) bytes long before payload_size() is used.

    However, payload_size() subtracts both the attacker-controlled BTH pad
    field and RXE_ICRC_SIZE from pkt->paylen:

      payload_size = pkt->paylen - offset[RXE_PAYLOAD] - bth_pad(pkt)
                     - RXE_ICRC_SIZE

    This means a short packet can still make payload_size() underflow even
    if it includes enough bytes for the fixed headers. Simply requiring
    header_size(pkt) + RXE_ICRC_SIZE is not sufficient either, because a
    packet with a forged non-zero BTH pad can still leave payload_size()
    negative and pass an underflowed value to later receive-path users.

    Fix this by validating pkt->paylen against the full minimum length
    required by payload_size(): header_size(pkt) + bth_pad(pkt) +
    RXE_ICRC_SIZE.

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-2026-143124
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?437702f1");
  # https://git.kernel.org/stable/c/2c0d71ef12f46c57d37bc571f3f2797db7eb50cc
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?409e561a");
  # https://git.kernel.org/stable/c/2fd4f8b749309a61c3f3f88ee8891d94f79e1240
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4bb4e333");
  # https://git.kernel.org/stable/c/5fedefec757192dcaad29a664ac332c7601be144
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2aa9c1b6");
  # https://git.kernel.org/stable/c/7244491dab347f648e661da96dc0febadd9daec3
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b3a1565b");
  # https://git.kernel.org/stable/c/9b924f3a26b21330a837cfe72e819b6393bbeeaa
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a665394f");
  # https://git.kernel.org/stable/c/c4376c672c3648d5bdc31dfffc329d07164f93c4
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?77e2b046");
  # https://git.kernel.org/stable/c/e8ee0e792d475b1067c199ef0af1b6221fa6f43d
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?87dd47d1");
  # https://git.kernel.org/stable/c/f83519a4c122c9c7a850a2197648a9ff4c67c520
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6e8c437d");
  # https://lore.kernel.org/linux-cve-announce/2026052751-CVE-2026-46043-153e@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?91ffb694");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2026-46043");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2026-46043");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/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:N/AC:L/PR:N/UI:N/S:U/C:H/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-2026-46043");

  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:"2026/05/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/22");

  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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.27.uelc20', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.27.uelc20', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.27.uelc20', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.27.uelc20', '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_HOLE,
      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');
}