Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-013793)

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

include('compat.inc');

if (description)
{
  script_id(309500);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/26");

  script_cve_id("CVE-2022-50652");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-013793)");

  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-2026-013793 advisory.

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

    uio: uio_dmem_genirq: Fix missing unlock in irq configuration

    Commit b74351287d4b (uio: fix a sleep-in-atomic-context bug in
    uio_dmem_genirq_irqcontrol()) started calling disable_irq() without
    holding the spinlock because it can sleep. However, that fix introduced
    another bug: if interrupt is already disabled and a new disable request
    comes in, then the spinlock is not unlocked:

    root@localhost:~# printf '\x00\x00\x00\x00' > /dev/uio0
    root@localhost:~# printf '\x00\x00\x00\x00' > /dev/uio0
    root@localhost:~# [   14.851538] BUG: scheduling while atomic: bash/223/0x00000002
    [   14.851991] Modules linked in: uio_dmem_genirq uio myfpga(OE) bochs drm_vram_helper drm_ttm_helper ttm
    drm_kms_helper drm snd_pcm ppdev joydev psmouse snd_timer snd e1000fb_sys_fops syscopyarea parport
    sysfillrect soundcore sysimgblt input_leds pcspkr i2c_piix4 serio_raw floppy evbug qemu_fw_cfg mac_hid
    pata_acpi ip_tables x_tables autofs4 [last unloaded: parport_pc]
    [   14.854206] CPU: 0 PID: 223 Comm: bash Tainted: G           OE      6.0.0-rc7 #21
    [   14.854786] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
    rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
    [   14.855664] Call Trace:
    [   14.855861]  <TASK>
    [   14.856025]  dump_stack_lvl+0x4d/0x67
    [   14.856325]  dump_stack+0x14/0x1a
    [   14.856583]  __schedule_bug.cold+0x4b/0x5c
    [   14.856915]  __schedule+0xe81/0x13d0
    [   14.857199]  ? idr_find+0x13/0x20
    [   14.857456]  ? get_work_pool+0x2d/0x50
    [   14.857756]  ? __flush_work+0x233/0x280
    [   14.858068]  ? __schedule+0xa95/0x13d0
    [   14.858307]  ? idr_find+0x13/0x20
    [   14.858519]  ? get_work_pool+0x2d/0x50
    [   14.858798]  schedule+0x6c/0x100
    [   14.859009]  schedule_hrtimeout_range_clock+0xff/0x110
    [   14.859335]  ? tty_write_room+0x1f/0x30
    [   14.859598]  ? n_tty_poll+0x1ec/0x220
    [   14.859830]  ? tty_ldisc_deref+0x1a/0x20
    [   14.860090]  schedule_hrtimeout_range+0x17/0x20
    [   14.860373]  do_select+0x596/0x840
    [   14.860627]  ? __kernel_text_address+0x16/0x50
    [   14.860954]  ? poll_freewait+0xb0/0xb0
    [   14.861235]  ? poll_freewait+0xb0/0xb0
    [   14.861517]  ? rpm_resume+0x49d/0x780
    [   14.861798]  ? common_interrupt+0x59/0xa0
    [   14.862127]  ? asm_common_interrupt+0x2b/0x40
    [   14.862511]  ? __uart_start.isra.0+0x61/0x70
    [   14.862902]  ? __check_object_size+0x61/0x280
    [   14.863255]  core_sys_select+0x1c6/0x400
    [   14.863575]  ? vfs_write+0x1c9/0x3d0
    [   14.863853]  ? vfs_write+0x1c9/0x3d0
    [   14.864121]  ? _copy_from_user+0x45/0x70
    [   14.864526]  do_pselect.constprop.0+0xb3/0xf0
    [   14.864893]  ? do_syscall_64+0x6d/0x90
    [   14.865228]  ? do_syscall_64+0x6d/0x90
    [   14.865556]  __x64_sys_pselect6+0x76/0xa0
    [   14.865906]  do_syscall_64+0x60/0x90
    [   14.866214]  ? syscall_exit_to_user_mode+0x2a/0x50
    [   14.866640]  ? do_syscall_64+0x6d/0x90
    [   14.866972]  ? do_syscall_64+0x6d/0x90
    [   14.867286]  ? do_syscall_64+0x6d/0x90
    [   14.867626]  entry_SYSCALL_64_after_hwframe+0x63/0xcd
    [...] stripped
    [   14.872959]  </TASK>

    ('myfpga' is a simple 'uio_dmem_genirq' driver I wrote to test this)

    The implementation of uio_dmem_genirq was based on uio_pdrv_genirq and
    it is used in a similar manner to the uio_pdrv_genirq driver with respect
    to interrupt configuration and handling. At the time uio_dmem_genirq was
    introduced, both had the same implementation of the 'uio_info' handlers
    irqcontrol() and handler(). Then commit 34cb27528398 (UIO: Fix concurrency
    issue), which was only applied to uio_pdrv_genirq, ended up making them
    a little different. That commit, among other things, changed disable_irq()
    to disable_irq_nosync() in the implementation of irqcontrol(). The
    motivation there was to avoid a deadlock between irqcontrol() and
    handler(), since it added a spinlock in the irq handler, and disable_irq()
    waits for the completion of the irq handler.

    By changing disable_irq() to disable_irq_nosync() in irqcontrol(), we also
    avoid the sleeping-whil
    ---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-2026-013793
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6c7d2e32");
  # https://lore.kernel.org/linux-cve-announce/2025120937-CVE-2022-50652-b7be@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?721283a1");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50652");
  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-2022-50652");

  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:"2021/07/21");
  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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 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': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-38', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-38', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-38', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-38', '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');
}