Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987672)

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

include('compat.inc');

if (description)
{
  script_id(270994);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/21");

  script_cve_id("CVE-2022-49741");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987672)");

  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-2025-987672 advisory.

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

    fbdev: smscufx: fix error handling code in ufx_usb_probe

    The current error handling code in ufx_usb_probe have many unmatching
    issues, e.g., missing ufx_free_usb_list, destroy_modedb label should
    only include framebuffer_release, fb_dealloc_cmap only matches
    fb_alloc_cmap.

    My local syzkaller reports a memory leak bug:

    memory leak in ufx_usb_probe

    BUG: memory leak
    unreferenced object 0xffff88802f879580 (size 128):
      comm kworker/0:7, pid 17416, jiffies 4295067474 (age 46.710s)
      hex dump (first 32 bytes):
        80 21 7c 2e 80 88 ff ff 18 d0 d0 0c 80 88 ff ff  .!|.............
        00 d0 d0 0c 80 88 ff ff e0 ff ff ff 0f 00 00 00  ................
      backtrace:
        [<ffffffff814c99a0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1045
        [<ffffffff824d219c>] kmalloc include/linux/slab.h:553 [inline]
        [<ffffffff824d219c>] kzalloc include/linux/slab.h:689 [inline]
        [<ffffffff824d219c>] ufx_alloc_urb_list drivers/video/fbdev/smscufx.c:1873 [inline]
        [<ffffffff824d219c>] ufx_usb_probe+0x11c/0x15a0 drivers/video/fbdev/smscufx.c:1655
        [<ffffffff82d17927>] usb_probe_interface+0x177/0x370 drivers/usb/core/driver.c:396
        [<ffffffff82712f0d>] call_driver_probe drivers/base/dd.c:560 [inline]
        [<ffffffff82712f0d>] really_probe+0x12d/0x390 drivers/base/dd.c:639
        [<ffffffff8271322f>] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:778
        [<ffffffff827132da>] driver_probe_device+0x2a/0x120 drivers/base/dd.c:808
        [<ffffffff82713c27>] __device_attach_driver+0xf7/0x150 drivers/base/dd.c:936
        [<ffffffff82710137>] bus_for_each_drv+0xb7/0x100 drivers/base/bus.c:427
        [<ffffffff827136b5>] __device_attach+0x105/0x2d0 drivers/base/dd.c:1008
        [<ffffffff82711d36>] bus_probe_device+0xc6/0xe0 drivers/base/bus.c:487
        [<ffffffff8270e242>] device_add+0x642/0xdc0 drivers/base/core.c:3517
        [<ffffffff82d14d5f>] usb_set_configuration+0x8ef/0xb80 drivers/usb/core/message.c:2170
        [<ffffffff82d2576c>] usb_generic_driver_probe+0x8c/0xc0 drivers/usb/core/generic.c:238
        [<ffffffff82d16ffc>] usb_probe_device+0x5c/0x140 drivers/usb/core/driver.c:293
        [<ffffffff82712f0d>] call_driver_probe drivers/base/dd.c:560 [inline]
        [<ffffffff82712f0d>] really_probe+0x12d/0x390 drivers/base/dd.c:639
        [<ffffffff8271322f>] __driver_probe_device+0xbf/0x140 drivers/base/dd.c:778

    Fix this bug by rewriting the error handling code in ufx_usb_probe.

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-2025-987672
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?96b11a5f");
  # https://lore.kernel.org/linux-cve-announce/2025032757-CVE-2022-49741-65a7@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?afb48190");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49741");
  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-2022-49741");

  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:"2025/03/27");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/21");

  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-5.10.0-74.15', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.15', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.15', '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');
}