diff --git a/repos/system_upgrade/common/actors/checkmountoptions/actor.py b/repos/system_upgrade/common/actors/checkmountoptions/actor.py
index ce0e01c7ad..25f03c1436 100644
--- a/repos/system_upgrade/common/actors/checkmountoptions/actor.py
+++ b/repos/system_upgrade/common/actors/checkmountoptions/actor.py
@@ -11,6 +11,7 @@ class CheckMountOptions(Actor):
 
     Checks performed:
         - /var is mounted with the noexec option
+        - any fstab entry uses the _netdev mount option
     """
     name = "check_mount_options"
     consumes = (StorageInfo,)
diff --git a/repos/system_upgrade/common/actors/checkmountoptions/libraries/checkmountoptions.py b/repos/system_upgrade/common/actors/checkmountoptions/libraries/checkmountoptions.py
index 869c92f9b2..c0c9fc3de3 100644
--- a/repos/system_upgrade/common/actors/checkmountoptions/libraries/checkmountoptions.py
+++ b/repos/system_upgrade/common/actors/checkmountoptions/libraries/checkmountoptions.py
@@ -1,4 +1,5 @@
 from leapp import reporting
+from leapp.libraries.common.config import get_env
 from leapp.libraries.stdlib import api
 from leapp.models import StorageInfo
 
@@ -70,6 +71,56 @@ def check_noexec_on_var(storage_info):
             return
 
 
+def check_netdev_mounts(storage_info):
+    """Check for fstab entries with the _netdev mount option without nofail.
+
+    Entries combining _netdev with nofail are skipped: nofail tells systemd not
+    to fail the boot if the mount fails, so the upgrade can proceed even though
+    the network mount itself will not come up before the first reboot.
+    """
+    if get_env('LEAPP_DEVEL_INITRAM_NETWORK', None):
+        return
+
+    netdev_entries = [
+        entry for entry in storage_info.fstab
+        if '_netdev' in entry.fs_mntops.split(',')
+        and 'nofail' not in entry.fs_mntops.split(',')
+    ]
+
+    if not netdev_entries:
+        return
+
+    entries_str = '\n'.join(
+        '- {} (mounted at {})'.format(entry.fs_spec, entry.fs_file)
+        for entry in netdev_entries
+    )
+
+    reporting.create_report([
+        reporting.Title(
+            'Detected _netdev mount option in /etc/fstab, preventing a successful in-place upgrade.'
+        ),
+        reporting.Summary(
+            'Leapp detected one or more entries in /etc/fstab using the _netdev mount option '
+            'without nofail:\n{}\n\n'
+            'During the in-place upgrade, the system is disconnected from the network before '
+            'the first reboot. Entries with the _netdev option cannot be mounted at that point, '
+            'which causes the upgrade to fail.'.format(entries_str)
+        ),
+        reporting.Remediation(
+            hint=(
+                'Either remove the _netdev option from the affected /etc/fstab entries before '
+                'proceeding with the upgrade (and add it back afterwards if needed), or add the '
+                'nofail option so the boot does not fail when the network mount is unavailable.'
+            )
+        ),
+        reporting.RelatedResource('file', '/etc/fstab'),
+        reporting.Severity(reporting.Severity.HIGH),
+        reporting.Groups([reporting.Groups.FILESYSTEM, reporting.Groups.NETWORK]),
+        reporting.Groups([reporting.Groups.INHIBITOR]),
+    ])
+
+
 def check_mount_options():
     for storage_info in api.consume(StorageInfo):
         check_noexec_on_var(storage_info)
+        check_netdev_mounts(storage_info)
diff --git a/repos/system_upgrade/common/actors/checkmountoptions/tests/test_checkmountoptions.py b/repos/system_upgrade/common/actors/checkmountoptions/tests/test_checkmountoptions.py
index de19856bcc..01155142b7 100644
--- a/repos/system_upgrade/common/actors/checkmountoptions/tests/test_checkmountoptions.py
+++ b/repos/system_upgrade/common/actors/checkmountoptions/tests/test_checkmountoptions.py
@@ -4,7 +4,7 @@
 import pytest
 
 from leapp import reporting
-from leapp.libraries.actor.checkmountoptions import check_mount_options
+from leapp.libraries.actor.checkmountoptions import check_mount_options, check_netdev_mounts
 from leapp.libraries.common.testutils import create_report_mocked, CurrentActorMocked
 from leapp.libraries.stdlib import api
 from leapp.models import FstabEntry, MountEntry, StorageInfo
@@ -59,3 +59,42 @@ def test_var_mounted_with_noexec_is_detected(monkeypatch, fstab_entries, mounts,
     check_mount_options()
 
     assert bool(created_reports.called) == should_inhibit
+
+
+def _make_fstab_entry(fs_spec, fs_file, fs_mntops, fs_vfstype='ext4'):
+    return FstabEntry(fs_spec=fs_spec, fs_file=fs_file, fs_vfstype=fs_vfstype,
+                      fs_mntops=fs_mntops, fs_freq='0', fs_passno='0')
+
+
+@pytest.mark.parametrize(
+    ('fstab_mntops', 'initram_network_envar', 'should_inhibit'),
+    [
+        ('_netdev,defaults', None, True),
+        ('defaults,_netdev', None, True),
+        ('_netdev', None, True),
+        ('defaults', None, False),
+        ('netdev,defaults', None, False),
+        ('_netdev,defaults', '1', False),
+        ('_netdev,nofail', None, False),
+        ('nofail,_netdev,defaults', None, False),
+        ('_netdev,nofail,defaults', None, False),
+    ]
+)
+def test_netdev_in_fstab_is_detected(monkeypatch, fstab_mntops, initram_network_envar, should_inhibit):
+    fstab_entries = [
+        _make_fstab_entry('UUID=abc123', '/var/lib/psa/dumps', fstab_mntops),
+        _make_fstab_entry('/dev/sda1', '/', 'defaults'),
+    ]
+    storage_info = StorageInfo(fstab=fstab_entries)
+
+    envars = {'LEAPP_DEVEL_INITRAM_NETWORK': initram_network_envar} if initram_network_envar else {}
+    created_reports = create_report_mocked()
+    monkeypatch.setattr(api, 'current_actor', CurrentActorMocked(envars=envars))
+    monkeypatch.setattr(reporting, 'create_report', created_reports)
+
+    check_netdev_mounts(storage_info)
+
+    assert bool(created_reports.called) == should_inhibit
+    if should_inhibit:
+        assert '_netdev' in created_reports.report_fields['title']
+        assert 'UUID=abc123' in created_reports.report_fields['summary']