Unity Linux 20.1070a Security Update: kernel (UTSA-2025-395279)

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

include('compat.inc');

if (description)
{
  script_id(267828);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2025-21692");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-395279)");

  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-2025-395279 advisory.

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

    net: sched: fix ets qdisc OOB Indexing

    Haowei Yan <[email protected]> found that ets_class_from_arg() can
    index an Out-Of-Bound class in ets_class_from_arg() when passed clid of
    0. The overflow may cause local privilege escalation.

     [   18.852298] ------------[ cut here ]------------
     [   18.853271] UBSAN: array-index-out-of-bounds in net/sched/sch_ets.c:93:20
     [   18.853743] index 18446744073709551615 is out of range for type 'ets_class [16]'
     [   18.854254] CPU: 0 UID: 0 PID: 1275 Comm: poc Not tainted 6.12.6-dirty #17
     [   18.854821] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
     [   18.856532] Call Trace:
     [   18.857441]  <TASK>
     [   18.858227]  dump_stack_lvl+0xc2/0xf0
     [   18.859607]  dump_stack+0x10/0x20
     [   18.860908]  __ubsan_handle_out_of_bounds+0xa7/0xf0
     [   18.864022]  ets_class_change+0x3d6/0x3f0
     [   18.864322]  tc_ctl_tclass+0x251/0x910
     [   18.864587]  ? lock_acquire+0x5e/0x140
     [   18.865113]  ? __mutex_lock+0x9c/0xe70
     [   18.866009]  ? __mutex_lock+0xa34/0xe70
     [   18.866401]  rtnetlink_rcv_msg+0x170/0x6f0
     [   18.866806]  ? __lock_acquire+0x578/0xc10
     [   18.867184]  ? __pfx_rtnetlink_rcv_msg+0x10/0x10
     [   18.867503]  netlink_rcv_skb+0x59/0x110
     [   18.867776]  rtnetlink_rcv+0x15/0x30
     [   18.868159]  netlink_unicast+0x1c3/0x2b0
     [   18.868440]  netlink_sendmsg+0x239/0x4b0
     [   18.868721]  ____sys_sendmsg+0x3e2/0x410
     [   18.869012]  ___sys_sendmsg+0x88/0xe0
     [   18.869276]  ? rseq_ip_fixup+0x198/0x260
     [   18.869563]  ? rseq_update_cpu_node_id+0x10a/0x190
     [   18.869900]  ? trace_hardirqs_off+0x5a/0xd0
     [   18.870196]  ? syscall_exit_to_user_mode+0xcc/0x220
     [   18.870547]  ? do_syscall_64+0x93/0x150
     [   18.870821]  ? __memcg_slab_free_hook+0x69/0x290
     [   18.871157]  __sys_sendmsg+0x69/0xd0
     [   18.871416]  __x64_sys_sendmsg+0x1d/0x30
     [   18.871699]  x64_sys_call+0x9e2/0x2670
     [   18.871979]  do_syscall_64+0x87/0x150
     [   18.873280]  ? do_syscall_64+0x93/0x150
     [   18.874742]  ? lock_release+0x7b/0x160
     [   18.876157]  ? do_user_addr_fault+0x5ce/0x8f0
     [   18.877833]  ? irqentry_exit_to_user_mode+0xc2/0x210
     [   18.879608]  ? irqentry_exit+0x77/0xb0
     [   18.879808]  ? clear_bhb_loop+0x15/0x70
     [   18.880023]  ? clear_bhb_loop+0x15/0x70
     [   18.880223]  ? clear_bhb_loop+0x15/0x70
     [   18.880426]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
     [   18.880683] RIP: 0033:0x44a957
     [   18.880851] Code: ff ff e8 fc 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 f3 0f 1e fa 64 8b 04 25 18
    00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 8974 24
    10
     [   18.881766] RSP: 002b:00007ffcdd00fad8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
     [   18.882149] RAX: ffffffffffffffda RBX: 00007ffcdd010db8 RCX: 000000000044a957
     [   18.882507] RDX: 0000000000000000 RSI: 00007ffcdd00fb70 RDI: 0000000000000003
     [   18.885037] RBP: 00007ffcdd010bc0 R08: 000000000703c770 R09: 000000000703c7c0
     [   18.887203] R10: 0000000000000080 R11: 0000000000000246 R12: 0000000000000001
     [   18.888026] R13: 00007ffcdd010da8 R14: 00000000004ca7d0 R15: 0000000000000001
     [   18.888395]  </TASK>
     [   18.888610] ---[ end trace ]---

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-2025-395279
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?ed9916d9");
  # https://lore.kernel.org/linux-cve-announce/2025021056-CVE-2025-21692-9c7f@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?74aa8f63");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-21692");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/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:L/AC:L/PR:L/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-2025-21692");

  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:"2024/04/09");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/07/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/10/07");

  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:"^20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-74.12', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.12', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.12', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.12', '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');
}