Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013767)

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

include('compat.inc');

if (description)
{
  script_id(309614);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/22");

  script_cve_id("CVE-2025-39995");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013767)");

  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-2026-013767 advisory.

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

    media: i2c: tc358743: Fix use-after-free bugs caused by orphan timer in probe

    The state->timer is a cyclic timer that schedules work_i2c_poll and
    delayed_work_enable_hotplug, while rearming itself. Using timer_delete()
    fails to guarantee the timer isn't still running when destroyed, similarly
    cancel_delayed_work() cannot ensure delayed_work_enable_hotplug has
    terminated if already executing. During probe failure after timer
    initialization, these may continue running as orphans and reference the
    already-freed tc358743_state object through tc358743_irq_poll_timer.

    The following is the trace captured by KASAN.

    BUG: KASAN: slab-use-after-free in __run_timer_base.part.0+0x7d7/0x8c0
    Write of size 8 at addr ffff88800ded83c8 by task swapper/1/0
    ...
    Call Trace:
     <IRQ>
     dump_stack_lvl+0x55/0x70
     print_report+0xcf/0x610
     ? __pfx_sched_balance_find_src_group+0x10/0x10
     ? __run_timer_base.part.0+0x7d7/0x8c0
     kasan_report+0xb8/0xf0
     ? __run_timer_base.part.0+0x7d7/0x8c0
     __run_timer_base.part.0+0x7d7/0x8c0
     ? rcu_sched_clock_irq+0xb06/0x27d0
     ? __pfx___run_timer_base.part.0+0x10/0x10
     ? try_to_wake_up+0xb15/0x1960
     ? tmigr_update_events+0x280/0x740
     ? _raw_spin_lock_irq+0x80/0xe0
     ? __pfx__raw_spin_lock_irq+0x10/0x10
     tmigr_handle_remote_up+0x603/0x7e0
     ? __pfx_tmigr_handle_remote_up+0x10/0x10
     ? sched_balance_trigger+0x98/0x9f0
     ? sched_tick+0x221/0x5a0
     ? _raw_spin_lock_irq+0x80/0xe0
     ? __pfx__raw_spin_lock_irq+0x10/0x10
     ? tick_nohz_handler+0x339/0x440
     ? __pfx_tmigr_handle_remote_up+0x10/0x10
     __walk_groups.isra.0+0x42/0x150
     tmigr_handle_remote+0x1f4/0x2e0
     ? __pfx_tmigr_handle_remote+0x10/0x10
     ? ktime_get+0x60/0x140
     ? lapic_next_event+0x11/0x20
     ? clockevents_program_event+0x1d4/0x2a0
     ? hrtimer_interrupt+0x322/0x780
     handle_softirqs+0x16a/0x550
     irq_exit_rcu+0xaf/0xe0
     sysvec_apic_timer_interrupt+0x70/0x80
     </IRQ>
    ...

    Allocated by task 141:
     kasan_save_stack+0x24/0x50
     kasan_save_track+0x14/0x30
     __kasan_kmalloc+0x7f/0x90
     __kmalloc_node_track_caller_noprof+0x198/0x430
     devm_kmalloc+0x7b/0x1e0
     tc358743_probe+0xb7/0x610  i2c_device_probe+0x51d/0x880
     really_probe+0x1ca/0x5c0
     __driver_probe_device+0x248/0x310
     driver_probe_device+0x44/0x120
     __device_attach_driver+0x174/0x220
     bus_for_each_drv+0x100/0x190
     __device_attach+0x206/0x370
     bus_probe_device+0x123/0x170
     device_add+0xd25/0x1470
     i2c_new_client_device+0x7a0/0xcd0
     do_one_initcall+0x89/0x300
     do_init_module+0x29d/0x7f0
     load_module+0x4f48/0x69e0
     init_module_from_file+0xe4/0x150
     idempotent_init_module+0x320/0x670
     __x64_sys_finit_module+0xbd/0x120
     do_syscall_64+0xac/0x280
     entry_SYSCALL_64_after_hwframe+0x77/0x7f

    Freed by task 141:
     kasan_save_stack+0x24/0x50
     kasan_save_track+0x14/0x30
     kasan_save_free_info+0x3a/0x60
     __kasan_slab_free+0x3f/0x50
     kfree+0x137/0x370
     release_nodes+0xa4/0x100
     devres_release_group+0x1b2/0x380
     i2c_device_probe+0x694/0x880
     really_probe+0x1ca/0x5c0
     __driver_probe_device+0x248/0x310
     driver_probe_device+0x44/0x120
     __device_attach_driver+0x174/0x220
     bus_for_each_drv+0x100/0x190
     __device_attach+0x206/0x370
     bus_probe_device+0x123/0x170
     device_add+0xd25/0x1470
     i2c_new_client_device+0x7a0/0xcd0
     do_one_initcall+0x89/0x300
     do_init_module+0x29d/0x7f0
     load_module+0x4f48/0x69e0
     init_module_from_file+0xe4/0x150
     idempotent_init_module+0x320/0x670
     __x64_sys_finit_module+0xbd/0x120
     do_syscall_64+0xac/0x280
     entry_SYSCALL_64_after_hwframe+0x77/0x7f
    ...

    Replace timer_delete() with timer_delete_sync() and cancel_delayed_work()
    with cancel_delayed_work_sync() to ensure proper termination of timer and
    work items before resource cleanup.

    This bug was initially identified through static analysis. For reproduction
    and testing, I created a functional emulation of the tc358743 device via a
    kernel module and introduced faults through the debugfs interface.

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-2026-013767
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a5744ead");
  # https://lore.kernel.org/linux-cve-announce/2025101528-CVE-2025-39995-80ab@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9e7924be");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-39995");
  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-2025-39995");

  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:"2025/10/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/22");

  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:"^20.1070a([^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-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', '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');
}