Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013085)

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

include('compat.inc');

if (description)
{
  script_id(307788);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2025-40178");

  script_name(english:"Unity Linux 20.1070a Security Update: kernel (UTSA-2026-013085)");

  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-2026-013085 advisory.

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

    pid: Add a judgment for ns null in pid_nr_ns

    __task_pid_nr_ns
            ns = task_active_pid_ns(current);
            pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
                    if (pid && ns->level <= pid->level) {

    Sometimes null is returned for task_active_pid_ns. Then it will trigger kernel panic in pid_nr_ns.

    For example:
            Unable to handle kernel NULL pointer dereference at virtual address 0000000000000058
            Mem abort info:
            ESR = 0x0000000096000007
            EC = 0x25: DABT (current EL), IL = 32 bits
            SET = 0, FnV = 0
            EA = 0, S1PTW = 0
            FSC = 0x07: level 3 translation fault
            Data abort info:
            ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
            CM = 0, WnR = 0, TnD = 0, TagAccess = 0
            GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
            user pgtable: 4k pages, 39-bit VAs, pgdp=00000002175aa000
            [0000000000000058] pgd=08000002175ab003, p4d=08000002175ab003, pud=08000002175ab003,
    pmd=08000002175be003, pte=0000000000000000
            pstate: 834000c5 (Nzcv daIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
            pc : __task_pid_nr_ns+0x74/0xd0
            lr : __task_pid_nr_ns+0x24/0xd0
            sp : ffffffc08001bd10
            x29: ffffffc08001bd10 x28: ffffffd4422b2000 x27: 0000000000000001
            x26: ffffffd442821168 x25: ffffffd442821000 x24: 00000f89492eab31
            x23: 00000000000000c0 x22: ffffff806f5693c0 x21: ffffff806f5693c0
            x20: 0000000000000001 x19: 0000000000000000 x18: 0000000000000000
            x17: 00000000529c6ef0 x16: 00000000529c6ef0 x15: 00000000023a1adc
            x14: 0000000000000003 x13: 00000000007ef6d8 x12: 001167c391c78800
            x11: 00ffffffffffffff x10: 0000000000000000 x9 : 0000000000000001
            x8 : ffffff80816fa3c0 x7 : 0000000000000000 x6 : 49534d702d535449
            x5 : ffffffc080c4c2c0 x4 : ffffffd43ee128c8 x3 : ffffffd43ee124dc
            x2 : 0000000000000000 x1 : 0000000000000001 x0 : ffffff806f5693c0
            Call trace:
            __task_pid_nr_ns+0x74/0xd0
            ...
            __handle_irq_event_percpu+0xd4/0x284
            handle_irq_event+0x48/0xb0
            handle_fasteoi_irq+0x160/0x2d8
            generic_handle_domain_irq+0x44/0x60
            gic_handle_irq+0x4c/0x114
            call_on_irq_stack+0x3c/0x74
            do_interrupt_handler+0x4c/0x84
            el1_interrupt+0x34/0x58
            el1h_64_irq_handler+0x18/0x24
            el1h_64_irq+0x68/0x6c
            account_kernel_stack+0x60/0x144
            exit_task_stack_account+0x1c/0x80
            do_exit+0x7e4/0xaf8
            ...
            get_signal+0x7bc/0x8d8
            do_notify_resume+0x128/0x828
            el0_svc+0x6c/0x70
            el0t_64_sync_handler+0x68/0xbc
            el0t_64_sync+0x1a8/0x1ac
            Code: 35fffe54 911a02a8 f9400108 b4000128 (b9405a69)
            ---[ end trace 0000000000000000 ]---
            Kernel panic - not syncing: Oops: Fatal exception in interrupt

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-2026-013085
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?91552534");
  # https://lore.kernel.org/linux-cve-announce/2025111240-CVE-2025-40178-8673@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?1c53213d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2025-40178");
  script_set_attribute(attribute:"solution", value:
"Update the affected kernel package.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:M/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:H/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-2025-40178");

  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:"2025/11/04");
  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:"^20.1070a([^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-5.10.0-79.10', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.10', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.10', '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');
}