Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013181)

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

include('compat.inc');

if (description)
{
  script_id(307924);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2023-53587");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2026-013181)");

  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-2026-013181 advisory.

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

    ring-buffer: Sync IRQ works before buffer destruction

    If something was written to the buffer just before destruction,
    it may be possible (maybe not in a real system, but it did
    happen in ARCH=um with time-travel) to destroy the ringbuffer
    before the IRQ work ran, leading this KASAN report (or a crash
    without KASAN):

        BUG: KASAN: slab-use-after-free in irq_work_run_list+0x11a/0x13a
        Read of size 8 at addr 000000006d640a48 by task swapper/0

        CPU: 0 PID: 0 Comm: swapper Tainted: G        W  O       6.3.0-rc1 #7
        Stack:
         60c4f20f 0c203d48 41b58ab3 60f224fc
         600477fa 60f35687 60c4f20f 601273dd
         00000008 6101eb00 6101eab0 615be548
        Call Trace:
         [<60047a58>] show_stack+0x25e/0x282
         [<60c609e0>] dump_stack_lvl+0x96/0xfd
         [<60c50d4c>] print_report+0x1a7/0x5a8
         [<603078d3>] kasan_report+0xc1/0xe9
         [<60308950>] __asan_report_load8_noabort+0x1b/0x1d
         [<60232844>] irq_work_run_list+0x11a/0x13a
         [<602328b4>] irq_work_tick+0x24/0x34
         [<6017f9dc>] update_process_times+0x162/0x196
         [<6019f335>] tick_sched_handle+0x1a4/0x1c3
         [<6019fd9e>] tick_sched_timer+0x79/0x10c
         [<601812b9>] __hrtimer_run_queues.constprop.0+0x425/0x695
         [<60182913>] hrtimer_interrupt+0x16c/0x2c4
         [<600486a3>] um_timer+0x164/0x183
         [...]

        Allocated by task 411:
         save_stack_trace+0x99/0xb5
         stack_trace_save+0x81/0x9b
         kasan_save_stack+0x2d/0x54
         kasan_set_track+0x34/0x3e
         kasan_save_alloc_info+0x25/0x28
         ____kasan_kmalloc+0x8b/0x97
         __kasan_kmalloc+0x10/0x12
         __kmalloc+0xb2/0xe8
         load_elf_phdrs+0xee/0x182
         [...]

        The buggy address belongs to the object at 000000006d640800
         which belongs to the cache kmalloc-1k of size 1024
        The buggy address is located 584 bytes inside of
         freed 1024-byte region [000000006d640800, 000000006d640c00)

    Add the appropriate irq_work_sync() so the work finishes before
    the buffers are destroyed.

    Prior to the commit in the Fixes tag below, there was only a
    single global IRQ work, so this issue didn't exist.

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-2026-013181
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0dcc1cf9");
  # https://lore.kernel.org/linux-cve-announce/2025100425-CVE-2023-53587-411f@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?2dbc9b64");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53587");
  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-2023-53587");

  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:"2026/04/21");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  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:"^20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1070e', '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 && 'sw_64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-4.19.90-2306.4.0', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2306.4.0', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2306.4.0', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-4.19.90-2306.4.0', 'sp':'1070e', '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');
}