Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988719)

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

include('compat.inc');

if (description)
{
  script_id(273348);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49753");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988719)");

  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-2025-988719 advisory.

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

    dmaengine: Fix double increment of client_count in dma_chan_get()

    The first time dma_chan_get() is called for a channel the channel
    client_count is incorrectly incremented twice for public channels,
    first in balance_ref_count(), and again prior to returning. This
    results in an incorrect client count which will lead to the
    channel resources not being freed when they should be. A simple
     test of repeated module load and unload of async_tx on a Dell
     Power Edge R7425 also shows this resulting in a kref underflow
     warning.

    [  124.329662] async_tx: api initialized (async)
    [  129.000627] async_tx: api initialized (async)
    [  130.047839] ------------[ cut here ]------------
    [  130.052472] refcount_t: underflow; use-after-free.
    [  130.057279] WARNING: CPU: 3 PID: 19364 at lib/refcount.c:28
    refcount_warn_saturate+0xba/0x110
    [  130.065811] Modules linked in: async_tx(-) rfkill intel_rapl_msr
    intel_rapl_common amd64_edac edac_mce_amd ipmi_ssif kvm_amd dcdbas kvm
    mgag200 drm_shmem_helper acpi_ipmi irqbypass drm_kms_helper ipmi_si
    syscopyarea sysfillrect rapl pcspkr ipmi_devintf sysimgblt fb_sys_fops
    k10temp i2c_piix4 ipmi_msghandler acpi_power_meter acpi_cpufreq vfat
    fat drm fuse xfs libcrc32c sd_mod t10_pi sg ahci crct10dif_pclmul
    libahci crc32_pclmul crc32c_intel ghash_clmulni_intel igb megaraid_sas
    i40e libata i2c_algo_bit ccp sp5100_tco dca dm_mirror dm_region_hash
    dm_log dm_mod [last unloaded: async_tx]
    [  130.117361] CPU: 3 PID: 19364 Comm: modprobe Kdump: loaded Not
    tainted 5.14.0-185.el9.x86_64 #1
    [  130.126091] Hardware name: Dell Inc. PowerEdge R7425/02MJ3T, BIOS
    1.18.0 01/17/2022
    [  130.133806] RIP: 0010:refcount_warn_saturate+0xba/0x110
    [  130.139041] Code: 01 01 e8 6d bd 55 00 0f 0b e9 72 9d 8a 00 80 3d
    26 18 9c 01 00 75 85 48 c7 c7 f8 a3 03 9d c6 05 16 18 9c 01 01 e8 4a
    bd 55 00 <0f> 0b e9 4f 9d 8a 00 80 3d 01 18 9c 01 00 0f 85 5e ff ff ff
    48 c7
    [  130.157807] RSP: 0018:ffffbf98898afe68 EFLAGS: 00010286
    [  130.163036] RAX: 0000000000000000 RBX: ffff9da06028e598 RCX: 0000000000000000
    [  130.170172] RDX: ffff9daf9de26480 RSI: ffff9daf9de198a0 RDI: ffff9daf9de198a0
    [  130.177316] RBP: ffff9da7cddf3970 R08: 0000000000000000 R09: 00000000ffff7fff
    [  130.184459] R10: ffffbf98898afd00 R11: ffffffff9d9e8c28 R12: ffff9da7cddf1970
    [  130.191596] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
    [  130.198739] FS:  00007f646435c740(0000) GS:ffff9daf9de00000(0000)
    knlGS:0000000000000000
    [  130.206832] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [  130.212586] CR2: 00007f6463b214f0 CR3: 00000008ab98c000 CR4: 00000000003506e0
    [  130.219729] Call Trace:
    [  130.222192]  <TASK>
    [  130.224305]  dma_chan_put+0x10d/0x110
    [  130.227988]  dmaengine_put+0x7a/0xa0
    [  130.231575]  __do_sys_delete_module.constprop.0+0x178/0x280
    [  130.237157]  ? syscall_trace_enter.constprop.0+0x145/0x1d0
    [  130.242652]  do_syscall_64+0x5c/0x90
    [  130.246240]  ? exc_page_fault+0x62/0x150
    [  130.250178]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
    [  130.255243] RIP: 0033:0x7f6463a3f5ab
    [  130.258830] Code: 73 01 c3 48 8b 0d 75 a8 1b 00 f7 d8 64 89 01 48
    83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00
    00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 45 a8 1b 00 f7 d8 64 89
    01 48
    [  130.277591] RSP: 002b:00007fff22f972c8 EFLAGS: 00000206 ORIG_RAX:
    00000000000000b0
    [  130.285164] RAX: ffffffffffffffda RBX: 000055b6786edd40 RCX: 00007f6463a3f5ab
    [  130.292303] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055b6786edda8
    [  130.299443] RBP: 000055b6786edd40 R08: 0000000000000000 R09: 0000000000000000
    [  130.306584] R10: 00007f6463b9eac0 R11: 0000000000000206 R12: 000055b6786edda8
    [  130.313731] R13: 0000000000000000 R14: 000055b6786edda8 R15: 00007fff22f995f8
    [  130.320875]  </TASK>
    [  130.323081] ---[ end trace eff7156d56b5cf25 ]---

    cat /sys/class/dma/dma0chan*/in_use would get the wrong result.
    2
    2
    2

    Test-by: Jie Hai <[email protected]>

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-2025-988719
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?aabf36e8");
  # https://lore.kernel.org/linux-cve-announce/2025032701-CVE-2022-49753-d1ce@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?c68c16a4");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49753");
  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: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-2022-49753");

  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:"2023/02/22");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}