Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099781)

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

include('compat.inc');

if (description)
{
  script_id(336942);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2023-53363");

  script_name(english:"Unity Linux 20.1050e Security Update: kernel (UTSA-2026-099781)");

  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-2026-099781 advisory.

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

    PCI: Fix use-after-free in pci_bus_release_domain_nr()

    Commit c14f7ccc9f5d (PCI: Assign PCI domain IDs by ida_alloc())
    introduced a use-after-free bug in the bus removal cleanup. The issue was
    found with kfence:

      [   19.293351] BUG: KFENCE: use-after-free read in pci_bus_release_domain_nr+0x10/0x70

      [   19.302817] Use-after-free read at 0x000000007f3b80eb (in kfence-#115):
      [   19.309677]  pci_bus_release_domain_nr+0x10/0x70
      [   19.309691]  dw_pcie_host_deinit+0x28/0x78
      [   19.309702]  tegra_pcie_deinit_controller+0x1c/0x38 [pcie_tegra194]
      [   19.309734]  tegra_pcie_dw_probe+0x648/0xb28 [pcie_tegra194]
      [   19.309752]  platform_probe+0x90/0xd8
      ...

      [   19.311457] kfence-#115: 0x00000000063a155a-0x00000000ba698da8, size=1072, cache=kmalloc-2k

      [   19.311469] allocated by task 96 on cpu 10 at 19.279323s:
      [   19.311562]  __kmem_cache_alloc_node+0x260/0x278
      [   19.311571]  kmalloc_trace+0x24/0x30
      [   19.311580]  pci_alloc_bus+0x24/0xa0
      [   19.311590]  pci_register_host_bridge+0x48/0x4b8
      [   19.311601]  pci_scan_root_bus_bridge+0xc0/0xe8
      [   19.311613]  pci_host_probe+0x18/0xc0
      [   19.311623]  dw_pcie_host_init+0x2c0/0x568
      [   19.311630]  tegra_pcie_dw_probe+0x610/0xb28 [pcie_tegra194]
      [   19.311647]  platform_probe+0x90/0xd8
      ...

      [   19.311782] freed by task 96 on cpu 10 at 19.285833s:
      [   19.311799]  release_pcibus_dev+0x30/0x40
      [   19.311808]  device_release+0x30/0x90
      [   19.311814]  kobject_put+0xa8/0x120
      [   19.311832]  device_unregister+0x20/0x30
      [   19.311839]  pci_remove_bus+0x78/0x88
      [   19.311850]  pci_remove_root_bus+0x5c/0x98
      [   19.311860]  dw_pcie_host_deinit+0x28/0x78
      [   19.311866]  tegra_pcie_deinit_controller+0x1c/0x38 [pcie_tegra194]
      [   19.311883]  tegra_pcie_dw_probe+0x648/0xb28 [pcie_tegra194]
      [   19.311900]  platform_probe+0x90/0xd8
      ...

      [   19.313579] CPU: 10 PID: 96 Comm: kworker/u24:2 Not tainted 6.2.0 #4
      [   19.320171] Hardware name:  /, BIOS 1.0-d7fb19b 08/10/2022
      [   19.325852] Workqueue: events_unbound deferred_probe_work_func

    The stack trace is a bit misleading as dw_pcie_host_deinit() doesn't
    directly call pci_bus_release_domain_nr(). The issue turns out to be in
    pci_remove_root_bus() which first calls pci_remove_bus() which frees the
    struct pci_bus when its struct device is released. Then
    pci_bus_release_domain_nr() is called and accesses the freed struct
    pci_bus. Reordering these fixes the issue.

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-2026-099781
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f0cbd889");
  # https://git.kernel.org/stable/c/07a75c0050e59c50f038cc5f4e2a3258c8f8c9d0
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?43bea6e2");
  # https://git.kernel.org/stable/c/30ba2d09edb5ea857a1473ae3d820911347ada62
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b234ca33");
  # https://git.kernel.org/stable/c/52b0343c7d628f37b38e3279ba585526b850ad3b
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?57ce46dd");
  # https://git.kernel.org/stable/c/ad367516b1c09317111255ecfbf5e42c33e31918
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b024f993");
  # https://git.kernel.org/stable/c/fbf45385e3419b8698b5e0a434847072375cfec2
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?4fabe980");
  # https://lore.kernel.org/linux-cve-announce/2025091722-CVE-2023-53363-4ac2@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a875efa1");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53363");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-53363");
  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-2023-53363");

  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:"2025/09/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/08/17");

  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) 2026 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:"^20.1050e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e', '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': '1050e',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uel20', 'sp':'1050e', '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');
}