227 lines
12 KiB
JSON
227 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98398",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.346Z",
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"datePublished": "2026-10-14T13:25:59.676Z",
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"dateUpdated": "2026-10-19T09:18:51.739Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:18:51.739Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlocking/lockdep: Invalidate stale class_cache entries for zapped classes\n\nsyzbot reported a lockdep splat hitting DEBUG_LOCKS_WARN_ON(1) in\nhlock_class() due to an invalid class_idx:\n\n WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x382/0x2cf0 kernel/locking/lockdep.c:5203\n Workqueue: wg-crypt-wg0 wg_packet_tx_worker\n RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]\n RIP: 0010:check_wait_context kernel/locking/lockdep.c:4870 [inline]\n RIP: 0010:__lock_acquire+0x389/0x2cf0 kernel/locking/lockdep.c:5203\n Call Trace:\n <IRQ>\n lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5886\n _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173\n tcp_tsq_handler+0x29/0x200 net/ipv4/tcp_output.c:1291\n tcp_tsq_workfn+0x384/0x410 net/ipv4/tcp_output.c:1325\n ...\n\nWhen a lock class is zapped (e.g. during module unload or key\nunregistration), zap_class() clears the class's bit in\nlock_classes_in_use and removes it from the class hash table.\nHowever, existing lockdep_map instances embedded in data structures\nmay still retain a pointer to the zapped class in their class_cache[]\narray.\n\nWhen __lock_acquire() subsequently runs on such a lock, it finds\nlock->class_cache[subclass] != NULL, skipping register_lock_class()\nand assigning hlock->class_idx to the index of the zapped class. When\ncheck_wait_context() or hlock_class() inspects the held_lock, it finds\n!test_bit(class_idx, lock_classes_in_use) and warns. Furthermore, if\nthe zapped slot is subsequently re-allocated to an unrelated lock key,\nthe stale class_cache entry would erroneously match the unrelated\nclass (ABA issue).\n\nAdd lock_class_cache_is_valid() to validate that the cached class is\nwithin lock_classes bounds, still allocated in lock_classes_in_use\n(using uninstrumented arch_test_bit() in __always_inline context so it\nis safe in noinstr contexts like match_held_lock()), and that\nclass->key matches the expected subkey (taking lockdep_set_subclass()\noverrides into account). Also use READ_ONCE()/WRITE_ONCE() when\naccessing class_cache[]. If the entry is invalid or stale, fall back\nto register_lock_class() / look_up_lock_class()."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/locking/lockdep.c"
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],
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"versions": [
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "f8a1281ab82df5b51fd0384354d4b21daf2b7af0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "1c9d664e2e067fca69e5a41d68e23bbc66a583fe",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "6bc345f6d81ebe22e0f355c2a21d7e29691f9332",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "f63c86e9d267629758adaba18579e784ddd63c32",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "c7acfb04c7e2e2dea248282b21373d93296644dd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "baa320fbb2f9fea50f5632a307da8ce84fbef5bd",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4",
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"lessThan": "02c6be7d675b21d81f0ba3a524346850a8c0e3bf",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"kernel/locking/lockdep.c"
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],
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"versions": [
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{
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"version": "5.1",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.1",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"versionStartIncluding": "5.1",
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"versionEndExcluding": "5.15.222"
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f8a1281ab82df5b51fd0384354d4b21daf2b7af0"
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},
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{
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"url": "https://git.kernel.org/stable/c/1c9d664e2e067fca69e5a41d68e23bbc66a583fe"
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{
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"url": "https://git.kernel.org/stable/c/f63c86e9d267629758adaba18579e784ddd63c32"
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},
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{
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"url": "https://git.kernel.org/stable/c/c7acfb04c7e2e2dea248282b21373d93296644dd"
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{
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"url": "https://git.kernel.org/stable/c/baa320fbb2f9fea50f5632a307da8ce84fbef5bd"
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},
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{
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"url": "https://git.kernel.org/stable/c/02c6be7d675b21d81f0ba3a524346850a8c0e3bf"
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}
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],
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"title": "locking/lockdep: Invalidate stale class_cache entries for zapped classes",
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