Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100517)

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

include('compat.inc');

if (description)
{
  script_id(336149);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/08/17");

  script_cve_id("CVE-2026-64599");

  script_name(english:"Unity Linux 20.1050a Security Update: kernel (UTSA-2026-100517)");

  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-2026-100517 advisory.

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

    crypto: amlogic - avoid double cleanup in meson_crypto_probe()

    When meson_allocate_chanlist() fails after a partial allocation, it already
    unwinds the allocated chanlist state through its local error path.
    meson_crypto_probe() then jump to error_flow and calls
    meson_free_chanlist() again, causing the same per-flow resources to be torn
    down twice. In the reproduced failure path, the second teardown
    re-entered crypto_engine_exit() on an already destroyed worker and KASAN
    reported a slab-use-after-free in kthread_destroy_worker().

    Prevent double-free by handling partial allocation failures locally within
    meson_allocate_chanlist() and skipping the outer cleanup path.

    The bug was first flagged by an experimental analysis tool we are
    developing for kernel memory-management bugs while analyzing
    v6.13-rc1. The tool is still under development and is not yet publicly
    available.

    The bug was reproduced in a QEMU x86_64 guest booted with KASAN on v7.1,
    using the reproducer under tools/testing/meson_crypto_probe. The reproducer
    forces the second dma_alloc_attrs() call in the gxl-crypto probe path to
    return NULL, making meson_allocate_chanlist() fail after partial
    initialization. On the unpatched kernel this reliably triggered a
    slab-use-after-free. With this fix applied, the same reproducer no longer
    emits any KASAN report and the probe fails cleanly with -ENOMEM.

        ==================================================================
        BUG: KASAN: slab-use-after-free in kthread_destroy_worker+0xb2/0xd0
        Read of size 8 at addr ff1100010c057a68 by task insmod/265

        CPU: 1 UID: 0 PID: 265 Comm: insmod Tainted: G           O        7.1.0-rc2-00376-g810af9adc907-dirty
    #10 PREEMPT(lazy)
        Tainted: [O]=OOT_MODULE
        Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
        Call Trace:
         <TASK>
         dump_stack_lvl+0x68/0xa0
         print_report+0xcb/0x5e0
         ? __virt_addr_valid+0x21d/0x3f0
         ? kthread_destroy_worker+0xb2/0xd0
         ? kthread_destroy_worker+0xb2/0xd0
         kasan_report+0xca/0x100
         ? kthread_destroy_worker+0xb2/0xd0
         kthread_destroy_worker+0xb2/0xd0
         meson_crypto_probe+0x4d0/0xc10 [amlogic_gxl_crypto]
         platform_probe+0x99/0x140
         really_probe+0x1c6/0x6a0
         ? __pfx___device_attach_driver+0x10/0x10
         __driver_probe_device+0x248/0x310
         ? acpi_driver_match_device+0xb0/0x100
         driver_probe_device+0x48/0x210
         ? __pfx___device_attach_driver+0x10/0x10
         __device_attach_driver+0x160/0x320
         bus_for_each_drv+0x104/0x190
         ? __pfx_bus_for_each_drv+0x10/0x10
         ? _raw_spin_unlock_irqrestore+0x2c/0x50
         __device_attach+0x19d/0x3b0
         ? __pfx___device_attach+0x10/0x10
         ? do_raw_spin_unlock+0x53/0x220
         device_initial_probe+0x78/0xa0
         bus_probe_device+0x5b/0x130
         device_add+0xcfd/0x1430
         ? __pfx_device_add+0x10/0x10
         ? insert_resource+0x34/0x50
         ? lock_release+0xc9/0x290
         platform_device_add+0x24e/0x590
         ? __pfx_meson_crypto_probe_repro_init+0x10/0x10 [meson_crypto_probe_repro]
         meson_crypto_probe_repro_init+0x330/0xff0 [meson_crypto_probe_repro]
         do_one_initcall+0xc0/0x450
         ? __pfx_do_one_initcall+0x10/0x10
         ? _raw_spin_unlock_irqrestore+0x2c/0x50
         ? __create_object+0x59/0x80
         ? kasan_unpoison+0x27/0x60
         do_init_module+0x27b/0x7d0
         ? __pfx_do_init_module+0x10/0x10
         ? kasan_quarantine_put+0x84/0x1d0
         ? kfree+0x32c/0x510
         ? load_module+0x561e/0x5ff0
         load_module+0x54fe/0x5ff0
         ? __pfx_load_module+0x10/0x10
         ? security_file_permission+0x20/0x40
         ? kernel_read_file+0x23d/0x6e0
         ? mmap_region+0x235/0x4a0
         ? __pfx_kernel_read_file+0x10/0x10
         ? __file_has_perm+0x2c0/0x3e0
         init_module_from_file+0x158/0x180
         ? __pfx_init_module_from_file+0x10/0x10
         ? __lock_acquire+0x45a/0x1ba0
         ? idempotent_init_module+0x315/0x610
         ? lock_release+0xc9/0x290
         ? lock
    ---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-2026-100517
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?89c9339f");
  # https://lore.kernel.org/linux-cve-announce/2026080652-CVE-2026-64599-1278@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?10e6d3cd");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2026-64599");
  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-2026-64599");

  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:"2026/07/23");
  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:"^20.1050a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050a', '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': '1050a',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.18.uelc20', 'sp':'1050a', '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');
}