Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-010962)

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

include('compat.inc');

if (description)
{
  script_id(308792);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/22");

  script_cve_id("CVE-2023-53718");

  script_name(english:"Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-010962)");

  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-2026-010962 advisory.

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

    ring-buffer: Do not swap cpu_buffer during resize process

    When ring_buffer_swap_cpu was called during resize process,
    the cpu buffer was swapped in the middle, resulting in incorrect state.
    Continuing to run in the wrong state will result in oops.

    This issue can be easily reproduced using the following two scripts:
    /tmp # cat test1.sh
    //#! /bin/sh
    for i in `seq 0 100000`
    do
             echo 2000 > /sys/kernel/debug/tracing/buffer_size_kb
             sleep 0.5
             echo 5000 > /sys/kernel/debug/tracing/buffer_size_kb
             sleep 0.5
    done
    /tmp # cat test2.sh
    //#! /bin/sh
    for i in `seq 0 100000`
    do
            echo irqsoff > /sys/kernel/debug/tracing/current_tracer
            sleep 1
            echo nop > /sys/kernel/debug/tracing/current_tracer
            sleep 1
    done
    /tmp # ./test1.sh &
    /tmp # ./test2.sh &

    A typical oops log is as follows, sometimes with other different oops logs.

    [  231.711293] WARNING: CPU: 0 PID: 9 at kernel/trace/ring_buffer.c:2026 rb_update_pages+0x378/0x3f8
    [  231.713375] Modules linked in:
    [  231.714735] CPU: 0 PID: 9 Comm: kworker/0:1 Tainted: G        W          6.5.0-rc1-00276-g20edcec23f92
    #15
    [  231.716750] Hardware name: linux,dummy-virt (DT)
    [  231.718152] Workqueue: events update_pages_handler
    [  231.719714] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [  231.721171] pc : rb_update_pages+0x378/0x3f8
    [  231.722212] lr : rb_update_pages+0x25c/0x3f8
    [  231.723248] sp : ffff800082b9bd50
    [  231.724169] x29: ffff800082b9bd50 x28: ffff8000825f7000 x27: 0000000000000000
    [  231.726102] x26: 0000000000000001 x25: fffffffffffff010 x24: 0000000000000ff0
    [  231.728122] x23: ffff0000c3a0b600 x22: ffff0000c3a0b5c0 x21: fffffffffffffe0a
    [  231.730203] x20: ffff0000c3a0b600 x19: ffff0000c0102400 x18: 0000000000000000
    [  231.732329] x17: 0000000000000000 x16: 0000000000000000 x15: 0000ffffe7aa8510
    [  231.734212] x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000002
    [  231.736291] x11: ffff8000826998a8 x10: ffff800082b9baf0 x9 : ffff800081137558
    [  231.738195] x8 : fffffc00030e82c8 x7 : 0000000000000000 x6 : 0000000000000001
    [  231.740192] x5 : ffff0000ffbafe00 x4 : 0000000000000000 x3 : 0000000000000000
    [  231.742118] x2 : 00000000000006aa x1 : 0000000000000001 x0 : ffff0000c0007208
    [  231.744196] Call trace:
    [  231.744892]  rb_update_pages+0x378/0x3f8
    [  231.745893]  update_pages_handler+0x1c/0x38
    [  231.746893]  process_one_work+0x1f0/0x468
    [  231.747852]  worker_thread+0x54/0x410
    [  231.748737]  kthread+0x124/0x138
    [  231.749549]  ret_from_fork+0x10/0x20
    [  231.750434] ---[ end trace 0000000000000000 ]---
    [  233.720486] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
    [  233.721696] Mem abort info:
    [  233.721935]   ESR = 0x0000000096000004
    [  233.722283]   EC = 0x25: DABT (current EL), IL = 32 bits
    [  233.722596]   SET = 0, FnV = 0
    [  233.722805]   EA = 0, S1PTW = 0
    [  233.723026]   FSC = 0x04: level 0 translation fault
    [  233.723458] Data abort info:
    [  233.723734]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
    [  233.724176]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
    [  233.724589]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
    [  233.725075] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000104943000
    [  233.725592] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
    [  233.726231] Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP
    [  233.726720] Modules linked in:
    [  233.727007] CPU: 0 PID: 9 Comm: kworker/0:1 Tainted: G        W          6.5.0-rc1-00276-g20edcec23f92
    #15
    [  233.727777] Hardware name: linux,dummy-virt (DT)
    [  233.728225] Workqueue: events update_pages_handler
    [  233.728655] pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
    [  233.729054] pc : rb_update_pages+0x1a8/0x3f8
    [  233.729334] lr : rb_update_pages+0x154/0x3f8
    [  233.729592] sp : ffff800082b9bd50
    [  233.729792] x29: ffff800082b9bd50 x28: ffff8000825f7000 x27: 00000000
    ---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-2026-010962
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e9fbafb8");
  # https://lore.kernel.org/linux-cve-announce/2025102214-CVE-2023-53718-9142@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?a5094a6a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53718");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:H/Au:S/C:N/I:P/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:H/PR:L/UI:N/S:U/C:N/I:L/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-2023-53718");

  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:"2026/04/20");
  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:"^20.1050e|20.1060e|20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1050e / 20.1060e / 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': '1050e',
    'pkgs': [
      {'reference':'kernel-5.10.0-27.5', 'sp':'1050e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.5', 'sp':'1050e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-27.5', 'sp':'1050e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1060e',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060e', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070e', 'cpu':'sw_64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', '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');
}