Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100311)

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

include('compat.inc');

if (description)
{
  script_id(336482);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2025-38136");

  script_name(english:"Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100311)");

  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-2026-100311 advisory.

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

    usb: renesas_usbhs: Reorder clock handling and power management in probe

    Reorder the initialization sequence in `usbhs_probe()` to enable runtime
    PM before accessing registers, preventing potential crashes due to
    uninitialized clocks.

    Currently, in the probe path, registers are accessed before enabling the
    clocks, leading to a synchronous external abort on the RZ/V2H SoC.
    The problematic call flow is as follows:

        usbhs_probe()
            usbhs_sys_clock_ctrl()
                usbhs_bset()
                    usbhs_write()
                        iowrite16()  <-- Register access before enabling clocks

    Since `iowrite16()` is performed without ensuring the required clocks are
    enabled, this can lead to access errors. To fix this, enable PM runtime
    early in the probe function and ensure clocks are acquired before register
    access, preventing crashes like the following on RZ/V2H:

    [13.272640] Internal error: synchronous external abort: 0000000096000010 [#1] PREEMPT SMP
    [13.280814] Modules linked in: cec renesas_usbhs(+) drm_kms_helper fuse drm backlight ipv6
    [13.289088] CPU: 1 UID: 0 PID: 195 Comm: (udev-worker) Not tainted 6.14.0-rc7+ #98
    [13.296640] Hardware name: Renesas RZ/V2H EVK Board based on r9a09g057h44 (DT)
    [13.303834] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [13.310770] pc : usbhs_bset+0x14/0x4c [renesas_usbhs]
    [13.315831] lr : usbhs_probe+0x2e4/0x5ac [renesas_usbhs]
    [13.321138] sp : ffff8000827e3850
    [13.324438] x29: ffff8000827e3860 x28: 0000000000000000 x27: ffff8000827e3ca0
    [13.331554] x26: ffff8000827e3ba0 x25: ffff800081729668 x24: 0000000000000025
    [13.338670] x23: ffff0000c0f08000 x22: 0000000000000000 x21: ffff0000c0f08010
    [13.345783] x20: 0000000000000000 x19: ffff0000c3b52080 x18: 00000000ffffffff
    [13.352895] x17: 0000000000000000 x16: 0000000000000000 x15: ffff8000827e36ce
    [13.360009] x14: 00000000000003d7 x13: 00000000000003d7 x12: 0000000000000000
    [13.367122] x11: 0000000000000000 x10: 0000000000000aa0 x9 : ffff8000827e3750
    [13.374235] x8 : ffff0000c1850b00 x7 : 0000000003826060 x6 : 000000000000001c
    [13.381347] x5 : 000000030d5fcc00 x4 : ffff8000825c0000 x3 : 0000000000000000
    [13.388459] x2 : 0000000000000400 x1 : 0000000000000000 x0 : ffff0000c3b52080
    [13.395574] Call trace:
    [13.398013]  usbhs_bset+0x14/0x4c [renesas_usbhs] (P)
    [13.403076]  platform_probe+0x68/0xdc
    [13.406738]  really_probe+0xbc/0x2c0
    [13.410306]  __driver_probe_device+0x78/0x120
    [13.414653]  driver_probe_device+0x3c/0x154
    [13.418825]  __driver_attach+0x90/0x1a0
    [13.422647]  bus_for_each_dev+0x7c/0xe0
    [13.426470]  driver_attach+0x24/0x30
    [13.430032]  bus_add_driver+0xe4/0x208
    [13.433766]  driver_register+0x68/0x130
    [13.437587]  __platform_driver_register+0x24/0x30
    [13.442273]  renesas_usbhs_driver_init+0x20/0x1000 [renesas_usbhs]
    [13.448450]  do_one_initcall+0x60/0x1d4
    [13.452276]  do_init_module+0x54/0x1f8
    [13.456014]  load_module+0x1754/0x1c98
    [13.459750]  init_module_from_file+0x88/0xcc
    [13.464004]  __arm64_sys_finit_module+0x1c4/0x328
    [13.468689]  invoke_syscall+0x48/0x104
    [13.472426]  el0_svc_common.constprop.0+0xc0/0xe0
    [13.477113]  do_el0_svc+0x1c/0x28
    [13.480415]  el0_svc+0x30/0xcc
    [13.483460]  el0t_64_sync_handler+0x10c/0x138
    [13.487800]  el0t_64_sync+0x198/0x19c
    [13.491453] Code: 2a0103e1 12003c42 12003c63 8b010084 (79400084)
    [13.497522] ---[ end trace 0000000000000000 ]---

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-2026-100311
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d94e52b3");
  # https://lore.kernel.org/linux-cve-announce/2025070332-CVE-2025-38136-1489@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2fc8ffd7");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-38136");
  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-2025-38136");

  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:"2025/07/03");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/17");

  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:"^20.1050a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050a', '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': '1050a',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', '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');
}