Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992472)

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

include('compat.inc');

if (description)
{
  script_id(280452);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/30");

  script_cve_id("CVE-2022-50118");

  script_name(english:"Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2025-992472)");

  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-2025-992472 advisory.

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

    powerpc/perf: Optimize clearing the pending PMI and remove WARN_ON for PMI check in power_pmu_disable

    commit 2c9ac51b850d (powerpc/perf: Fix PMU callbacks to clear
    pending PMI before resetting an overflown PMC) added a new
    function pmi_irq_pending in hw_irq.h. This function is to check
    if there is a PMI marked as pending in Paca (PACA_IRQ_PMI).This is
    used in power_pmu_disable in a WARN_ON. The intention here is to
    provide a warning if there is PMI pending, but no counter is found
    overflown.

    During some of the perf runs, below warning is hit:

    WARNING: CPU: 36 PID: 0 at arch/powerpc/perf/core-book3s.c:1332 power_pmu_disable+0x25c/0x2c0
     Modules linked in:
     -----

     NIP [c000000000141c3c] power_pmu_disable+0x25c/0x2c0
     LR [c000000000141c8c] power_pmu_disable+0x2ac/0x2c0
     Call Trace:
     [c000000baffcfb90] [c000000000141c8c] power_pmu_disable+0x2ac/0x2c0 (unreliable)
     [c000000baffcfc10] [c0000000003e2f8c] perf_pmu_disable+0x4c/0x60
     [c000000baffcfc30] [c0000000003e3344] group_sched_out.part.124+0x44/0x100
     [c000000baffcfc80] [c0000000003e353c] __perf_event_disable+0x13c/0x240
     [c000000baffcfcd0] [c0000000003dd334] event_function+0xc4/0x140
     [c000000baffcfd20] [c0000000003d855c] remote_function+0x7c/0xa0
     [c000000baffcfd50] [c00000000026c394] flush_smp_call_function_queue+0xd4/0x300
     [c000000baffcfde0] [c000000000065b24] smp_ipi_demux_relaxed+0xa4/0x100
     [c000000baffcfe20] [c0000000000cb2b0] xive_muxed_ipi_action+0x20/0x40
     [c000000baffcfe40] [c000000000207c3c] __handle_irq_event_percpu+0x8c/0x250
     [c000000baffcfee0] [c000000000207e2c] handle_irq_event_percpu+0x2c/0xa0
     [c000000baffcff10] [c000000000210a04] handle_percpu_irq+0x84/0xc0
     [c000000baffcff40] [c000000000205f14] generic_handle_irq+0x54/0x80
     [c000000baffcff60] [c000000000015740] __do_irq+0x90/0x1d0
     [c000000baffcff90] [c000000000016990] __do_IRQ+0xc0/0x140
     [c0000009732f3940] [c000000bafceaca8] 0xc000000bafceaca8
     [c0000009732f39d0] [c000000000016b78] do_IRQ+0x168/0x1c0
     [c0000009732f3a00] [c0000000000090c8] hardware_interrupt_common_virt+0x218/0x220

    This means that there is no PMC overflown among the active events
    in the PMU, but there is a PMU pending in Paca. The function
    any_pmc_overflown checks the PMCs on active events in
    cpuhw->n_events. Code snippet:

    <<>>
    if (any_pmc_overflown(cpuhw))
            clear_pmi_irq_pending();
     else
            WARN_ON(pmi_irq_pending());
    <<>>

    Here the PMC overflown is not from active event. Example: When we do
    perf record, default cycles and instructions will be running on PMC6
    and PMC5 respectively. It could happen that overflowed event is currently
    not active and pending PMI is for the inactive event. Debug logs from
    trace_printk:

    <<>>
    any_pmc_overflown: idx is 5: pmc value is 0xd9a
    power_pmu_disable: PMC1: 0x0, PMC2: 0x0, PMC3: 0x0, PMC4: 0x0, PMC5: 0xd9a, PMC6: 0x80002011
    <<>>

    Here active PMC (from idx) is PMC5 , but overflown PMC is PMC6(0x80002011).
    When we handle PMI interrupt for such cases, if the PMC overflown is
    from inactive event, it will be ignored. Reference commit:
    commit bc09c219b2e6 (powerpc/perf: Fix finding overflowed PMC in interrupt)

    Patch addresses two changes:
    1) Fix 1 : Removal of warning ( WARN_ON(pmi_irq_pending()); )
       We were printing warning if no PMC is found overflown among active PMU
       events, but PMI pending in PACA. But this could happen in cases where
       PMC overflown is not in active PMC. An inactive event could have caused
       the overflow. Hence the warning is not needed. To know pending PMI is
       from an inactive event, we need to loop through all PMC's which will
       cause more SPR reads via mfspr and increase in context switch. Also in
       existing function: perf_event_interrupt, already we ignore PMI's
       overflown when it is from an inactive PMC.

    2) Fix 2: optimization in clearing pending PMI.
       Currently we check for any active PMC overflown before clearing PMI
       pending in Paca. This is causing additional SP
    ---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-2025-992472
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?3836acac");
  # https://lore.kernel.org/linux-cve-announce/2025061810-CVE-2022-50118-60c9@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?6c4b3668");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-50118");
  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-2022-50118");

  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:"2025/06/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/30");

  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) 2025 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:"^20.1060e|20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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 && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    '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':'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':'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');
}