Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992887)

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

include('compat.inc');

if (description)
{
  script_id(281404);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/12/31");

  script_cve_id("CVE-2024-38601");

  script_name(english:"Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2025-992887)");

  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-2025-992887 advisory.

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

    ring-buffer: Fix a race between readers and resize checks

    The reader code in rb_get_reader_page() swaps a new reader page into the
    ring buffer by doing cmpxchg on old->list.prev->next to point it to the
    new page. Following that, if the operation is successful,
    old->list.next->prev gets updated too. This means the underlying
    doubly-linked list is temporarily inconsistent, page->prev->next or
    page->next->prev might not be equal back to page for some page in the
    ring buffer.

    The resize operation in ring_buffer_resize() can be invoked in parallel.
    It calls rb_check_pages() which can detect the described inconsistency
    and stop further tracing:

    [  190.271762] ------------[ cut here ]------------
    [  190.271771] WARNING: CPU: 1 PID: 6186 at kernel/trace/ring_buffer.c:1467
    rb_check_pages.isra.0+0x6a/0xa0
    [  190.271789] Modules linked in: [...]
    [  190.271991] Unloaded tainted modules: intel_uncore_frequency(E):1 skx_edac(E):1
    [  190.272002] CPU: 1 PID: 6186 Comm: cmd.sh Kdump: loaded Tainted: G            E      6.9.0-rc6-default
    #5 158d3e1e6d0b091c34c3b96bfd99a1c58306d79f
    [  190.272011] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
    rel-1.16.0-0-gd239552c-rebuilt.opensuse.org 04/01/2014
    [  190.272015] RIP: 0010:rb_check_pages.isra.0+0x6a/0xa0
    [  190.272023] Code: [...]
    [  190.272028] RSP: 0018:ffff9c37463abb70 EFLAGS: 00010206
    [  190.272034] RAX: ffff8eba04b6cb80 RBX: 0000000000000007 RCX: ffff8eba01f13d80
    [  190.272038] RDX: ffff8eba01f130c0 RSI: ffff8eba04b6cd00 RDI: ffff8eba0004c700
    [  190.272042] RBP: ffff8eba0004c700 R08: 0000000000010002 R09: 0000000000000000
    [  190.272045] R10: 00000000ffff7f52 R11: ffff8eba7f600000 R12: ffff8eba0004c720
    [  190.272049] R13: ffff8eba00223a00 R14: 0000000000000008 R15: ffff8eba067a8000
    [  190.272053] FS:  00007f1bd64752c0(0000) GS:ffff8eba7f680000(0000) knlGS:0000000000000000
    [  190.272057] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [  190.272061] CR2: 00007f1bd6662590 CR3: 000000010291e001 CR4: 0000000000370ef0
    [  190.272070] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [  190.272073] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    [  190.272077] Call Trace:
    [  190.272098]  <TASK>
    [  190.272189]  ring_buffer_resize+0x2ab/0x460
    [  190.272199]  __tracing_resize_ring_buffer.part.0+0x23/0xa0
    [  190.272206]  tracing_resize_ring_buffer+0x65/0x90
    [  190.272216]  tracing_entries_write+0x74/0xc0
    [  190.272225]  vfs_write+0xf5/0x420
    [  190.272248]  ksys_write+0x67/0xe0
    [  190.272256]  do_syscall_64+0x82/0x170
    [  190.272363]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
    [  190.272373] RIP: 0033:0x7f1bd657d263
    [  190.272381] Code: [...]
    [  190.272385] RSP: 002b:00007ffe72b643f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
    [  190.272391] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f1bd657d263
    [  190.272395] RDX: 0000000000000002 RSI: 0000555a6eb538e0 RDI: 0000000000000001
    [  190.272398] RBP: 0000555a6eb538e0 R08: 000000000000000a R09: 0000000000000000
    [  190.272401] R10: 0000555a6eb55190 R11: 0000000000000246 R12: 00007f1bd6662500
    [  190.272404] R13: 0000000000000002 R14: 00007f1bd6667c00 R15: 0000000000000002
    [  190.272412]  </TASK>
    [  190.272414] ---[ end trace 0000000000000000 ]---

    Note that ring_buffer_resize() calls rb_check_pages() only if the parent
    trace_buffer has recording disabled. Recent commit d78ab792705c
    (tracing: Stop current tracer when resizing buffer) causes that it is
    now always the case which makes it more likely to experience this issue.

    The window to hit this race is nonetheless very small. To help
    reproducing it, one can add a delay loop in rb_get_reader_page():

     ret = rb_head_page_replace(reader, cpu_buffer->reader_page);
     if (!ret)
            goto spin;
     for (unsigned i = 0; i < 1U << 26; i++)  /* inserted delay loop */
            __asm__ __volatile__ ( : : : memory);
     rb_list_head(reader->list.next)->prev = &cpu_buffer->reader_page->list;

    ..
    ---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-2025-992887
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?b509edbe");
  # https://lore.kernel.org/linux-cve-announce/2024061923-CVE-2024-38601-dc52@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d31c1e7a");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2024-38601");
  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: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:H/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-2024-38601");

  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:"2024/06/19");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/12/31");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/12/31");

  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:"^20.1060a|20.1070a([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 20.1060a / 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 && 'loongarch64' >!< cpu && 'x86_64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'UOS Server', cpu);


var constraints = [
  {
    'release': '20',
    'sp': '1060a',
    'pkgs': [
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-46.38', 'sp':'1060a', 'cpu':'x86_64', 'rpm_spec_vers_cmp':TRUE}
    ]
  },
  {
    'release': '20',
    'sp': '1070a',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', 'sp':'1070a', 'cpu':'loongarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.5', '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_NOTE,
      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');
}