Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986975)

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

include('compat.inc');

if (description)
{
  script_id(268342);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2021-47598");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-986975)");

  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-2025-986975 advisory.

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

    sch_cake: do not call cake_destroy() from cake_init()

    qdiscs are not supposed to call their own destroy() method
    from init(), because core stack already does that.

    syzbot was able to trigger use after free:

    DEBUG_LOCKS_WARN_ON(lock->magic != lock)
    WARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock_common kernel/locking/mutex.c:586
    [inline]
    WARNING: CPU: 0 PID: 21902 at kernel/locking/mutex.c:586 __mutex_lock+0x9ec/0x12f0
    kernel/locking/mutex.c:740
    Modules linked in:
    CPU: 0 PID: 21902 Comm: syz-executor189 Not tainted 5.16.0-rc4-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:586 [inline]
    RIP: 0010:__mutex_lock+0x9ec/0x12f0 kernel/locking/mutex.c:740
    Code: 08 84 d2 0f 85 19 08 00 00 8b 05 97 38 4b 04 85 c0 0f 85 27 f7 ff ff 48 c7 c6 20 00 ac 89 48 c7 c7
    a0 fe ab 89 e8 bf 76 ba ff <0f> 0b e9 0d f7 ff ff 48 8b 44 24 40 48 8d b8 c8 08 00 00 48 89 f8
    RSP: 0018:ffffc9000627f290 EFLAGS: 00010282
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
    RDX: ffff88802315d700 RSI: ffffffff815f1db8 RDI: fffff52000c4fe44
    RBP: ffff88818f28e000 R08: 0000000000000000 R09: 0000000000000000
    R10: ffffffff815ebb5e R11: 0000000000000000 R12: 0000000000000000
    R13: dffffc0000000000 R14: ffffc9000627f458 R15: 0000000093c30000
    FS:  0000555556abc400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007fda689c3303 CR3: 000000001cfbb000 CR4: 0000000000350ef0
    Call Trace:
     <TASK>
     tcf_chain0_head_change_cb_del+0x2e/0x3d0 net/sched/cls_api.c:810
     tcf_block_put_ext net/sched/cls_api.c:1381 [inline]
     tcf_block_put_ext net/sched/cls_api.c:1376 [inline]
     tcf_block_put+0xbc/0x130 net/sched/cls_api.c:1394
     cake_destroy+0x3f/0x80 net/sched/sch_cake.c:2695
     qdisc_create.constprop.0+0x9da/0x10f0 net/sched/sch_api.c:1293
     tc_modify_qdisc+0x4c5/0x1980 net/sched/sch_api.c:1660
     rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571
     netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496
     netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
     netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
     netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921
     sock_sendmsg_nosec net/socket.c:704 [inline]
     sock_sendmsg+0xcf/0x120 net/socket.c:724
     ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
     ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
     __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
     do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
     entry_SYSCALL_64_after_hwframe+0x44/0xae
    RIP: 0033:0x7f1bb06badb9
    Code: Unable to access opcode bytes at RIP 0x7f1bb06bad8f.
    RSP: 002b:00007fff3012a658 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
    RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f1bb06badb9
    RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000003
    RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000003
    R10: 0000000000000003 R11: 0000000000000246 R12: 00007fff3012a688
    R13: 00007fff3012a6a0 R14: 00007fff3012a6e0 R15: 00000000000013c2
     </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-2025-986975
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?8067448e");
  # https://lore.kernel.org/linux-cve-announce/2024061921-CVE-2021-47598-3fad@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0b3cfeaf");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2021-47598");
  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-2021-47598");

  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:"2022/01/28");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/09/23");
  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:"^20.1070e([^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-5.10.0-74.16', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-74.16', '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');
}