Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989176)

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

include('compat.inc');

if (description)
{
  script_id(273024);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-48796");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2025-989176)");

  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-2025-989176 advisory.

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

    iommu: Fix potential use-after-free during probe

    Kasan has reported the following use after free on dev->iommu.
    when a device probe fails and it is in process of freeing dev->iommu
    in dev_iommu_free function, a deferred_probe_work_func runs in parallel
    and tries to access dev->iommu->fwspec in of_iommu_configure path thus
    causing use after free.

    BUG: KASAN: use-after-free in of_iommu_configure+0xb4/0x4a4
    Read of size 8 at addr ffffff87a2f1acb8 by task kworker/u16:2/153

    Workqueue: events_unbound deferred_probe_work_func
    Call trace:
     dump_backtrace+0x0/0x33c
     show_stack+0x18/0x24
     dump_stack_lvl+0x16c/0x1e0
     print_address_description+0x84/0x39c
     __kasan_report+0x184/0x308
     kasan_report+0x50/0x78
     __asan_load8+0xc0/0xc4
     of_iommu_configure+0xb4/0x4a4
     of_dma_configure_id+0x2fc/0x4d4
     platform_dma_configure+0x40/0x5c
     really_probe+0x1b4/0xb74
     driver_probe_device+0x11c/0x228
     __device_attach_driver+0x14c/0x304
     bus_for_each_drv+0x124/0x1b0
     __device_attach+0x25c/0x334
     device_initial_probe+0x24/0x34
     bus_probe_device+0x78/0x134
     deferred_probe_work_func+0x130/0x1a8
     process_one_work+0x4c8/0x970
     worker_thread+0x5c8/0xaec
     kthread+0x1f8/0x220
     ret_from_fork+0x10/0x18

    Allocated by task 1:
     ____kasan_kmalloc+0xd4/0x114
     __kasan_kmalloc+0x10/0x1c
     kmem_cache_alloc_trace+0xe4/0x3d4
     __iommu_probe_device+0x90/0x394
     probe_iommu_group+0x70/0x9c
     bus_for_each_dev+0x11c/0x19c
     bus_iommu_probe+0xb8/0x7d4
     bus_set_iommu+0xcc/0x13c
     arm_smmu_bus_init+0x44/0x130 [arm_smmu]
     arm_smmu_device_probe+0xb88/0xc54 [arm_smmu]
     platform_drv_probe+0xe4/0x13c
     really_probe+0x2c8/0xb74
     driver_probe_device+0x11c/0x228
     device_driver_attach+0xf0/0x16c
     __driver_attach+0x80/0x320
     bus_for_each_dev+0x11c/0x19c
     driver_attach+0x38/0x48
     bus_add_driver+0x1dc/0x3a4
     driver_register+0x18c/0x244
     __platform_driver_register+0x88/0x9c
     init_module+0x64/0xff4 [arm_smmu]
     do_one_initcall+0x17c/0x2f0
     do_init_module+0xe8/0x378
     load_module+0x3f80/0x4a40
     __se_sys_finit_module+0x1a0/0x1e4
     __arm64_sys_finit_module+0x44/0x58
     el0_svc_common+0x100/0x264
     do_el0_svc+0x38/0xa4
     el0_svc+0x20/0x30
     el0_sync_handler+0x68/0xac
     el0_sync+0x160/0x180

    Freed by task 1:
     kasan_set_track+0x4c/0x84
     kasan_set_free_info+0x28/0x4c
     ____kasan_slab_free+0x120/0x15c
     __kasan_slab_free+0x18/0x28
     slab_free_freelist_hook+0x204/0x2fc
     kfree+0xfc/0x3a4
     __iommu_probe_device+0x284/0x394
     probe_iommu_group+0x70/0x9c
     bus_for_each_dev+0x11c/0x19c
     bus_iommu_probe+0xb8/0x7d4
     bus_set_iommu+0xcc/0x13c
     arm_smmu_bus_init+0x44/0x130 [arm_smmu]
     arm_smmu_device_probe+0xb88/0xc54 [arm_smmu]
     platform_drv_probe+0xe4/0x13c
     really_probe+0x2c8/0xb74
     driver_probe_device+0x11c/0x228
     device_driver_attach+0xf0/0x16c
     __driver_attach+0x80/0x320
     bus_for_each_dev+0x11c/0x19c
     driver_attach+0x38/0x48
     bus_add_driver+0x1dc/0x3a4
     driver_register+0x18c/0x244
     __platform_driver_register+0x88/0x9c
     init_module+0x64/0xff4 [arm_smmu]
     do_one_initcall+0x17c/0x2f0
     do_init_module+0xe8/0x378
     load_module+0x3f80/0x4a40
     __se_sys_finit_module+0x1a0/0x1e4
     __arm64_sys_finit_module+0x44/0x58
     el0_svc_common+0x100/0x264
     do_el0_svc+0x38/0xa4
     el0_svc+0x20/0x30
     el0_sync_handler+0x68/0xac
     el0_sync+0x160/0x180

    Fix this by setting dev->iommu to NULL first and
    then freeing dev_iommu structure in dev_iommu_free
    function.

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-2025-989176
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4d225121");
  # https://lore.kernel.org/linux-cve-announce/2024071642-CVE-2022-48796-8474@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?01c9dffe");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-48796");
  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-2022-48796");

  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:"2022/03/08");
  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');
}