Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992903)

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

include('compat.inc');

if (description)
{
  script_id(281237);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2025-21877");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992903)");

  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-2025-992903 advisory.

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

    usbnet: gl620a: fix endpoint checking in genelink_bind()

    Syzbot reports [1] a warning in usb_submit_urb() triggered by
    inconsistencies between expected and actually present endpoints
    in gl620a driver. Since genelink_bind() does not properly
    verify whether specified eps are in fact provided by the device,
    in this case, an artificially manufactured one, one may get a
    mismatch.

    Fix the issue by resorting to a usbnet utility function
    usbnet_get_endpoints(), usually reserved for this very problem.
    Check for endpoints and return early before proceeding further if
    any are missing.

    [1] Syzbot report:
    usb 5-1: Manufacturer: syz
    usb 5-1: SerialNumber: syz
    usb 5-1: config 0 descriptor??
    gl620a 5-1:0.23 usb0: register 'gl620a' at usb-dummy_hcd.0-1, ...
    ------------[ cut here ]------------
    usb 5-1: BOGUS urb xfer, pipe 3 != type 1
    WARNING: CPU: 2 PID: 1841 at drivers/usb/core/urb.c:503 usb_submit_urb+0xe4b/0x1730
    drivers/usb/core/urb.c:503
    Modules linked in:
    CPU: 2 UID: 0 PID: 1841 Comm: kworker/2:2 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0
    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
    Workqueue: mld mld_ifc_work
    RIP: 0010:usb_submit_urb+0xe4b/0x1730 drivers/usb/core/urb.c:503
    ...
    Call Trace:
     <TASK>
     usbnet_start_xmit+0x6be/0x2780 drivers/net/usb/usbnet.c:1467
     __netdev_start_xmit include/linux/netdevice.h:5002 [inline]
     netdev_start_xmit include/linux/netdevice.h:5011 [inline]
     xmit_one net/core/dev.c:3590 [inline]
     dev_hard_start_xmit+0x9a/0x7b0 net/core/dev.c:3606
     sch_direct_xmit+0x1ae/0xc30 net/sched/sch_generic.c:343
     __dev_xmit_skb net/core/dev.c:3827 [inline]
     __dev_queue_xmit+0x13d4/0x43e0 net/core/dev.c:4400
     dev_queue_xmit include/linux/netdevice.h:3168 [inline]
     neigh_resolve_output net/core/neighbour.c:1514 [inline]
     neigh_resolve_output+0x5bc/0x950 net/core/neighbour.c:1494
     neigh_output include/net/neighbour.h:539 [inline]
     ip6_finish_output2+0xb1b/0x2070 net/ipv6/ip6_output.c:141
     __ip6_finish_output net/ipv6/ip6_output.c:215 [inline]
     ip6_finish_output+0x3f9/0x1360 net/ipv6/ip6_output.c:226
     NF_HOOK_COND include/linux/netfilter.h:303 [inline]
     ip6_output+0x1f8/0x540 net/ipv6/ip6_output.c:247
     dst_output include/net/dst.h:450 [inline]
     NF_HOOK include/linux/netfilter.h:314 [inline]
     NF_HOOK include/linux/netfilter.h:308 [inline]
     mld_sendpack+0x9f0/0x11d0 net/ipv6/mcast.c:1819
     mld_send_cr net/ipv6/mcast.c:2120 [inline]
     mld_ifc_work+0x740/0xca0 net/ipv6/mcast.c:2651
     process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229
     process_scheduled_works kernel/workqueue.c:3310 [inline]
     worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391
     kthread+0x2c1/0x3a0 kernel/kthread.c:389
     ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
     ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
     </TASK>

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-2025-992903
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3a3c21ff");
  # https://lore.kernel.org/linux-cve-announce/2025032711-CVE-2025-21877-de70@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3d691f25");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-21877");
  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-2025-21877");

  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:"2025/03/14");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 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': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', '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_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');
}