Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989980)

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

include('compat.inc');

if (description)
{
  script_id(272544);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2023-52886");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989980)");

  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-2025-989980 advisory.

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

    USB: core: Fix race by not overwriting udev->descriptor in hub_port_init()

    Syzbot reported an out-of-bounds read in sysfs.c:read_descriptors():

    BUG: KASAN: slab-out-of-bounds in read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883
    Read of size 8 at addr ffff88801e78b8c8 by task udevd/5011

    CPU: 0 PID: 5011 Comm: udevd Not tainted 6.4.0-rc6-syzkaller-00195-g40f71e7cd3c6 #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
    Call Trace:
     <TASK>
     __dump_stack lib/dump_stack.c:88 [inline]
     dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
     print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
     print_report mm/kasan/report.c:462 [inline]
     kasan_report+0x11c/0x130 mm/kasan/report.c:572
     read_descriptors+0x263/0x280 drivers/usb/core/sysfs.c:883
    ...
    Allocated by task 758:
    ...
     __do_kmalloc_node mm/slab_common.c:966 [inline]
     __kmalloc+0x5e/0x190 mm/slab_common.c:979
     kmalloc include/linux/slab.h:563 [inline]
     kzalloc include/linux/slab.h:680 [inline]
     usb_get_configuration+0x1f7/0x5170 drivers/usb/core/config.c:887
     usb_enumerate_device drivers/usb/core/hub.c:2407 [inline]
     usb_new_device+0x12b0/0x19d0 drivers/usb/core/hub.c:2545

    As analyzed by Khazhy Kumykov, the cause of this bug is a race between
    read_descriptors() and hub_port_init(): The first routine uses a field
    in udev->descriptor, not expecting it to change, while the second
    overwrites it.

    Prior to commit 45bf39f8df7f (USB: core: Don't hold device lock while
    reading the descriptors sysfs file) this race couldn't occur,
    because the routines were mutually exclusive thanks to the device
    locking.  Removing that locking from read_descriptors() exposed it to
    the race.

    The best way to fix the bug is to keep hub_port_init() from changing
    udev->descriptor once udev has been initialized and registered.
    Drivers expect the descriptors stored in the kernel to be immutable;
    we should not undermine this expectation.  In fact, this change should
    have been made long ago.

    So now hub_port_init() will take an additional argument, specifying a
    buffer in which to store the device descriptor it reads.  (If udev has
    not yet been initialized, the buffer pointer will be NULL and then
    hub_port_init() will store the device descriptor in udev as before.)
    This eliminates the data race responsible for the out-of-bounds read.

    The changes to hub_port_init() appear more extensive than they really
    are, because of indentation changes resulting from an attempt to avoid
    writing to other parts of the usb_device structure after it has been
    initialized.  Similar changes should be made to the code that reads
    the BOS descriptor, but that can be handled in a separate patch later
    on.  This patch is sufficient to fix the bug found by syzbot.

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-2025-989980
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?929a3400");
  # https://lore.kernel.org/linux-cve-announce/2024071601-CVE-2023-52886-a235@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f78d690a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-52886");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:N/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:P/AC:H/PR:N/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-2023-52886");

  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:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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) 2025 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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}