Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005778)

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

include('compat.inc');

if (description)
{
  script_id(300742);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/04");

  script_cve_id("CVE-2023-53375");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-005778)");

  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-2026-005778 advisory.

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

    tracing: Free error logs of tracing instances

    When a tracing instance is removed, the error messages that hold errors
    that occurred in the instance needs to be freed. The following reports a
    memory leak:

     # cd /sys/kernel/tracing
     # mkdir instances/foo
     # echo 'hist:keys=x' > instances/foo/events/sched/sched_switch/trigger
     # cat instances/foo/error_log
     [  117.404795] hist:sched:sched_switch: error: Couldn't find field
       Command: hist:keys=x
                          ^
     # rmdir instances/foo

    Then check for memory leaks:

     # echo scan > /sys/kernel/debug/kmemleak
     # cat /sys/kernel/debug/kmemleak
    unreferenced object 0xffff88810d8ec700 (size 192):
      comm bash, pid 869, jiffies 4294950577 (age 215.752s)
      hex dump (first 32 bytes):
        60 dd 68 61 81 88 ff ff 60 dd 68 61 81 88 ff ff  `.ha....`.ha....
        a0 30 8c 83 ff ff ff ff 26 00 0a 00 00 00 00 00  .0......&.......
      backtrace:
        [<00000000dae26536>] kmalloc_trace+0x2a/0xa0
        [<00000000b2938940>] tracing_log_err+0x277/0x2e0
        [<000000004a0e1b07>] parse_atom+0x966/0xb40
        [<0000000023b24337>] parse_expr+0x5f3/0xdb0
        [<00000000594ad074>] event_hist_trigger_parse+0x27f8/0x3560
        [<00000000293a9645>] trigger_process_regex+0x135/0x1a0
        [<000000005c22b4f2>] event_trigger_write+0x87/0xf0
        [<000000002cadc509>] vfs_write+0x162/0x670
        [<0000000059c3b9be>] ksys_write+0xca/0x170
        [<00000000f1cddc00>] do_syscall_64+0x3e/0xc0
        [<00000000868ac68c>] entry_SYSCALL_64_after_hwframe+0x72/0xdc
    unreferenced object 0xffff888170c35a00 (size 32):
      comm bash, pid 869, jiffies 4294950577 (age 215.752s)
      hex dump (first 32 bytes):
        0a 20 20 43 6f 6d 6d 61 6e 64 3a 20 68 69 73 74  .  Command: hist
        3a 6b 65 79 73 3d 78 0a 00 00 00 00 00 00 00 00  :keys=x.........
      backtrace:
        [<000000006a747de5>] __kmalloc+0x4d/0x160
        [<000000000039df5f>] tracing_log_err+0x29b/0x2e0
        [<000000004a0e1b07>] parse_atom+0x966/0xb40
        [<0000000023b24337>] parse_expr+0x5f3/0xdb0
        [<00000000594ad074>] event_hist_trigger_parse+0x27f8/0x3560
        [<00000000293a9645>] trigger_process_regex+0x135/0x1a0
        [<000000005c22b4f2>] event_trigger_write+0x87/0xf0
        [<000000002cadc509>] vfs_write+0x162/0x670
        [<0000000059c3b9be>] ksys_write+0xca/0x170
        [<00000000f1cddc00>] do_syscall_64+0x3e/0xc0
        [<00000000868ac68c>] entry_SYSCALL_64_after_hwframe+0x72/0xdc

    The problem is that the error log needs to be freed when the instance is
    removed.

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-2026-005778
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?73bf5540");
  # https://lore.kernel.org/linux-cve-announce/2025091855-CVE-2023-53375-a29f@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?80090506");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2023-53375");
  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-2023-53375");

  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:"2026/03/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/04");

  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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.7', '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');
}