Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987243)

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

include('compat.inc');

if (description)
{
  script_id(268703);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/10/15");

  script_cve_id("CVE-2022-49441");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987243)");

  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-2025-987243 advisory.

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

    tty: fix deadlock caused by calling printk() under tty_port->lock

    pty_write() invokes kmalloc() which may invoke a normal printk() to print
    failure message.  This can cause a deadlock in the scenario reported by
    syz-bot below:

           CPU0              CPU1                    CPU2
           ----              ----                    ----
                             lock(console_owner);
                                                     lock(&port_lock_key);
      lock(&port->lock);
                             lock(&port_lock_key);
                                                     lock(&port->lock);
      lock(console_owner);

    As commit dbdda842fe96 (printk: Add console owner and waiter logic to
    load balance console writes) said, such deadlock can be prevented by
    using printk_deferred() in kmalloc() (which is invoked in the section
    guarded by the port->lock).  But there are too many printk() on the
    kmalloc() path, and kmalloc() can be called from anywhere, so changing
    printk() to printk_deferred() is too complicated and inelegant.

    Therefore, this patch chooses to specify __GFP_NOWARN to kmalloc(), so
    that printk() will not be called, and this deadlock problem can be
    avoided.

    Syzbot reported the following lockdep error:

    ======================================================
    WARNING: possible circular locking dependency detected
    5.4.143-00237-g08ccc19a-dirty #10 Not tainted
    ------------------------------------------------------
    syz-executor.4/29420 is trying to acquire lock:
    ffffffff8aedb2a0 (console_owner){....}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:1752
    [inline]
    ffffffff8aedb2a0 (console_owner){....}-{0:0}, at: vprintk_emit+0x2ca/0x470 kernel/printk/printk.c:2023

    but task is already holding lock:
    ffff8880119c9158 (&port->lock){-.-.}-{2:2}, at: pty_write+0xf4/0x1f0 drivers/tty/pty.c:120

    which lock already depends on the new lock.

    the existing dependency chain (in reverse order) is:

    -> #2 (&port->lock){-.-.}-{2:2}:
           __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
           _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159
           tty_port_tty_get drivers/tty/tty_port.c:288 [inline]                     <-- lock(&port->lock);
           tty_port_default_wakeup+0x1d/0xb0 drivers/tty/tty_port.c:47
           serial8250_tx_chars+0x530/0xa80 drivers/tty/serial/8250/8250_port.c:1767
           serial8250_handle_irq.part.0+0x31f/0x3d0 drivers/tty/serial/8250/8250_port.c:1854
           serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1827 [inline]  <-- lock(&port_lock_key);
           serial8250_default_handle_irq+0xb2/0x220 drivers/tty/serial/8250/8250_port.c:1870
           serial8250_interrupt+0xfd/0x200 drivers/tty/serial/8250/8250_core.c:126
           __handle_irq_event_percpu+0x109/0xa50 kernel/irq/handle.c:156
           [...]

    -> #1 (&port_lock_key){-.-.}-{2:2}:
           __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
           _raw_spin_lock_irqsave+0x35/0x50 kernel/locking/spinlock.c:159
           serial8250_console_write+0x184/0xa40 drivers/tty/serial/8250/8250_port.c:3198
                                                                                    <-- lock(&port_lock_key);
           call_console_drivers kernel/printk/printk.c:1819 [inline]
           console_unlock+0x8cb/0xd00 kernel/printk/printk.c:2504
           vprintk_emit+0x1b5/0x470 kernel/printk/printk.c:2024                     <-- lock(console_owner);
           vprintk_func+0x8d/0x250 kernel/printk/printk_safe.c:394
           printk+0xba/0xed kernel/printk/printk.c:2084
           register_console+0x8b3/0xc10 kernel/printk/printk.c:2829
           univ8250_console_init+0x3a/0x46 drivers/tty/serial/8250/8250_core.c:681
           console_init+0x49d/0x6d3 kernel/printk/printk.c:2915
           start_kernel+0x5e9/0x879 init/main.c:713
           secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241

    -> #0 (console_owner){....}-{0:0}:
           [...]
           lock_acquire+0x127/0x340 kernel/locking/lockdep.c:4734
           console_trylock_spinning kernel/printk/printk.c:1773
    ---truncated---

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-2025-987243
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2e7a613f");
  # https://lore.kernel.org/linux-cve-announce/2025022657-CVE-2022-49441-8b58@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?5686f2b6");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49441");
  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-2022-49441");

  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:"2022/07/15");
  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');
}