Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989863)

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

include('compat.inc');

if (description)
{
  script_id(273245);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/11/05");

  script_cve_id("CVE-2022-49402");

  script_name(english:"Unity Linux 20.1070e Security Update: kernel (UTSA-2025-989863)");

  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-2025-989863 advisory.

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

    ftrace: Clean up hash direct_functions on register failures

    We see the following GPF when register_ftrace_direct fails:

    [ ] general protection fault, probably for non-canonical address \
      0x200000000000010: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI
    [...]
    [ ] RIP: 0010:ftrace_find_rec_direct+0x53/0x70
    [ ] Code: 48 c1 e0 03 48 03 42 08 48 8b 10 31 c0 48 85 d2 74 [...]
    [ ] RSP: 0018:ffffc9000138bc10 EFLAGS: 00010206
    [ ] RAX: 0000000000000000 RBX: ffffffff813e0df0 RCX: 000000000000003b
    [ ] RDX: 0200000000000000 RSI: 000000000000000c RDI: ffffffff813e0df0
    [ ] RBP: ffffffffa00a3000 R08: ffffffff81180ce0 R09: 0000000000000001
    [ ] R10: ffffc9000138bc18 R11: 0000000000000001 R12: ffffffff813e0df0
    [ ] R13: ffffffff813e0df0 R14: ffff888171b56400 R15: 0000000000000000
    [ ] FS:  00007fa9420c7780(0000) GS:ffff888ff6a00000(0000) knlGS:000000000
    [ ] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    [ ] CR2: 000000000770d000 CR3: 0000000107d50003 CR4: 0000000000370ee0
    [ ] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    [ ] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    [ ] Call Trace:
    [ ]  <TASK>
    [ ]  register_ftrace_direct+0x54/0x290
    [ ]  ? render_sigset_t+0xa0/0xa0
    [ ]  bpf_trampoline_update+0x3f5/0x4a0
    [ ]  ? 0xffffffffa00a3000
    [ ]  bpf_trampoline_link_prog+0xa9/0x140
    [ ]  bpf_tracing_prog_attach+0x1dc/0x450
    [ ]  bpf_raw_tracepoint_open+0x9a/0x1e0
    [ ]  ? find_held_lock+0x2d/0x90
    [ ]  ? lock_release+0x150/0x430
    [ ]  __sys_bpf+0xbd6/0x2700
    [ ]  ? lock_is_held_type+0xd8/0x130
    [ ]  __x64_sys_bpf+0x1c/0x20
    [ ]  do_syscall_64+0x3a/0x80
    [ ]  entry_SYSCALL_64_after_hwframe+0x44/0xae
    [ ] RIP: 0033:0x7fa9421defa9
    [ ] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 9 f8 [...]
    [ ] RSP: 002b:00007ffed743bd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
    [ ] RAX: ffffffffffffffda RBX: 00000000069d2480 RCX: 00007fa9421defa9
    [ ] RDX: 0000000000000078 RSI: 00007ffed743bd80 RDI: 0000000000000011
    [ ] RBP: 00007ffed743be00 R08: 0000000000bb7270 R09: 0000000000000000
    [ ] R10: 00000000069da210 R11: 0000000000000246 R12: 0000000000000001
    [ ] R13: 00007ffed743c4b0 R14: 00000000069d2480 R15: 0000000000000001
    [ ]  </TASK>
    [ ] Modules linked in: klp_vm(OK)
    [ ] ---[ end trace 0000000000000000 ]---

    One way to trigger this is:
      1. load a livepatch that patches kernel function xxx;
      2. run bpftrace -e 'kfunc:xxx {}', this will fail (expected for now);
      3. repeat #2 => gpf.

    This is because the entry is added to direct_functions, but not removed.
    Fix this by remove the entry from direct_functions when
    register_ftrace_direct fails.

    Also remove the last trailing space from ftrace.c, so we don't have to
    worry about it anymore.

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-2025-989863
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?fe7d7508");
  # https://lore.kernel.org/linux-cve-announce/2025022651-CVE-2022-49402-73ee@gregkh
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e84b0d2d");
  script_set_attribute(attribute:"see_also", value:"https://nvd.nist.gov/vuln/detail/CVE-2022-49402");
  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-2022-49402");

  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:"2022/07/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/11/05");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/11/05");

  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:"^20.1070e([^0-9]|$)", string:os_version)) audit(AUDIT_OS_NOT, 'UOS Server 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': '1070e',
    'pkgs': [
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'aarch64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', 'sp':'1070e', 'cpu':'amd64', 'rpm_spec_vers_cmp':TRUE},
      {'reference':'kernel-5.10.0-79.4.2', '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');
}