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locking/lockdep: Invalidate stale class_cache entries for zapped classes

Type: advisorySource: Official CVE List1 source record

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+0x382/0x2cf0 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+0x389/0x2cf0 kernel/locking/lockdep.c:5203 Call Trace: lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5886 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173 tcp_tsq_handler+0x29/0x200 net/ipv4/tcp_output.c:1291 tcp_tsq_workfn+0x384/0x410 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's 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->class_cache[subclass] != NULL, skipping register_lock_class() and assigning hlock->class_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

Announced Source revision 1
Original source ↗

CVE-2026-98398

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98398

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "f8a1281ab82df5b51fd0384354d4b21daf2b7af0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "1c9d664e2e067fca69e5a41d68e23bbc66a583fe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "6bc345f6d81ebe22e0f355c2a21d7e29691f9332",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "f63c86e9d267629758adaba18579e784ddd63c32",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "c7acfb04c7e2e2dea248282b21373d93296644dd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "baa320fbb2f9fea50f5632a307da8ce84fbef5bd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
        "lessThan": "02c6be7d675b21d81f0ba3a524346850a8c0e3bf",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/locking/lockdep.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/locking/lockdep.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98398

Source reference: /cveMetadata/cveId

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Event
#38464 · Revision 1
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