{
  "cveId": "CVE-2026-98398",
  "url": "https://patchblox.com/security/cve/CVE-2026-98398",
  "summary": "CVE-2026-98398 is fixed in 38 products on 1 platform, first by DEBIAN-CVE-2026-98398, released October 16, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  locking/lockdep: Invalidate stale class_cache en...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  locking/lockdep: Invalidate stale class_cache entries for zapped classes  syzbot reported a lockdep splat hitting DEBUG_LOCKS_WARN_ON(1) in hlock_class() due to an invalid class_idx:    WARNING: kernel/locking/lockdep.c:238 at __lock_acquire\u002B0x382/0x2cf0 kernel/locking/lockdep.c:5203   Workqueue: wg-crypt-wg0 wg_packet_tx_worker   RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]   RIP: 0010:check_wait_context kernel/locking/lockdep.c:4870 [inline]   RIP: 0010:__lock_acquire\u002B0x389/0x2cf0 kernel/locking/lockdep.c:5203   Call Trace:    \u003CIRQ\u003E    lock_acquire\u002B0x106/0x350 kernel/locking/lockdep.c:5886    _raw_spin_lock\u002B0x2e/0x40 kernel/locking/spinlock.c:173    tcp_tsq_handler\u002B0x29/0x200 net/ipv4/tcp_output.c:1291    tcp_tsq_workfn\u002B0x384/0x410 net/ipv4/tcp_output.c:1325    ...  When a lock class is zapped (e.g. during module unload or key unregistration), zap_class() clears the class\u0027s bit in lock_classes_in_use and removes it from the class hash table. However, existing lockdep_map instances embedded in data structures may still retain a pointer to the zapped class in their class_cache[] array.  When __lock_acquire() subsequently runs on such a lock, it finds lock-\u003Eclass_cache[subclass] != NULL, skipping register_lock_class() and assigning hlock-\u003Eclass_idx to the index of the zapped class. When check_wait_context() or hlock_class() inspects the held_lock, it finds !test_bit(class_idx, lock_classes_in_use) and warns. Furthermore, if the zapped slot is subsequently re-allocated to an unrelated lock key, the stale class_cache entry would erroneously match the unrelated class (ABA issue).  Add lock_class_cache_is_valid() to validate that the cached class is within lock_classes bounds, still allocated in lock_classes_in_use (using uninstrumented arch_test_bit() in __always_inline context so it is safe in noinstr contexts like match_held_lock()), and that class-\u003Ekey matches the expected subkey (taking lockdep_set_subclass() overrides into account). Also use READ_ONCE()/WRITE_ONCE() when accessing class_cache[].  If the entry is invalid or stale, fall back to register_lock_class() / look_up_lock_class().",
  "published": "2026-10-12T09:00:00Z",
  "severity": "important",
  "epss": 0.00206,
  "epssPercentile": 0.1067,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "ALAS2023-2026-3193",
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      "released": "2026-11-07T01:06:52Z"
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      "fix": "ALAS2023-2026-3193",
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  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}