Unity Linux 20.1050e Security Update: kernel (UTSA-2026-006676)

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

include('compat.inc');

if (description)
{
  script_id(305335);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/08");

  script_cve_id("CVE-2023-53647");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-006676)");

  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-2026-006676 advisory.

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

    Drivers: hv: vmbus: Don't dereference ACPI root object handle

    Since the commit referenced in the Fixes: tag below the VMBus client driver
    is walking the ACPI namespace up from the VMBus ACPI device to the ACPI
    namespace root object trying to find Hyper-V MMIO ranges.

    However, if it is not able to find them it ends trying to walk resources of
    the ACPI namespace root object itself.
    This object has all-ones handle, which causes a NULL pointer dereference
    in the ACPI code (from dereferencing this pointer with an offset).

    This in turn causes an oops on boot with VMBus host implementations that do
    not provide Hyper-V MMIO ranges in their VMBus ACPI device or its
    ancestors.
    The QEMU VMBus implementation is an example of such implementation.

    I guess providing these ranges is optional, since all tested Windows
    versions seem to be able to use VMBus devices without them.

    Fix this by explicitly terminating the lookup at the ACPI namespace root
    object.

    Note that Linux guests under KVM/QEMU do not use the Hyper-V PV interface
    by default - they only do so if the KVM PV interface is missing or
    disabled.

    Example stack trace of such oops:
    [ 3.710827] ? __die+0x1f/0x60
    [ 3.715030] ? page_fault_oops+0x159/0x460
    [ 3.716008] ? exc_page_fault+0x73/0x170
    [ 3.716959] ? asm_exc_page_fault+0x22/0x30
    [ 3.717957] ? acpi_ns_lookup+0x7a/0x4b0
    [ 3.718898] ? acpi_ns_internalize_name+0x79/0xc0
    [ 3.720018] acpi_ns_get_node_unlocked+0xb5/0xe0
    [ 3.721120] ? acpi_ns_check_object_type+0xfe/0x200
    [ 3.722285] ? acpi_rs_convert_aml_to_resource+0x37/0x6e0
    [ 3.723559] ? down_timeout+0x3a/0x60
    [ 3.724455] ? acpi_ns_get_node+0x3a/0x60
    [ 3.725412] acpi_ns_get_node+0x3a/0x60
    [ 3.726335] acpi_ns_evaluate+0x1c3/0x2c0
    [ 3.727295] acpi_ut_evaluate_object+0x64/0x1b0
    [ 3.728400] acpi_rs_get_method_data+0x2b/0x70
    [ 3.729476] ? vmbus_platform_driver_probe+0x1d0/0x1d0 [hv_vmbus]
    [ 3.730940] ? vmbus_platform_driver_probe+0x1d0/0x1d0 [hv_vmbus]
    [ 3.732411] acpi_walk_resources+0x78/0xd0
    [ 3.733398] vmbus_platform_driver_probe+0x9f/0x1d0 [hv_vmbus]
    [ 3.734802] platform_probe+0x3d/0x90
    [ 3.735684] really_probe+0x19b/0x400
    [ 3.736570] ? __device_attach_driver+0x100/0x100
    [ 3.737697] __driver_probe_device+0x78/0x160
    [ 3.738746] driver_probe_device+0x1f/0x90
    [ 3.739743] __driver_attach+0xc2/0x1b0
    [ 3.740671] bus_for_each_dev+0x70/0xc0
    [ 3.741601] bus_add_driver+0x10e/0x210
    [ 3.742527] driver_register+0x55/0xf0
    [ 3.744412] ? 0xffffffffc039a000
    [ 3.745207] hv_acpi_init+0x3c/0x1000 [hv_vmbus]

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-2026-006676
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3a61ddb3");
  # https://lore.kernel.org/linux-cve-announce/2025100718-CVE-2023-53647-c01f@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f6993d5b");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53647");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/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:L/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-2023-53647");

  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:"2023/10/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/08");

  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-4.19.90-2211.5.0.0178.51', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.51', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2211.5.0.0178.51', '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');
}