{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98398", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.346Z", "datePublished": "2026-10-14T13:25:59.676Z", "dateUpdated": "2026-10-14T13:25:59.676Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-14T13:25:59.676Z" }, "descriptions": [ { "lang": "en", "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 \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()." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/locking/lockdep.c" ], "versions": [ { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "f8a1281ab82df5b51fd0384354d4b21daf2b7af0", "status": "affected", "versionType": "git" }, { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "1c9d664e2e067fca69e5a41d68e23bbc66a583fe", "status": "affected", "versionType": "git" }, { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "6bc345f6d81ebe22e0f355c2a21d7e29691f9332", "status": "affected", "versionType": "git" }, { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "f63c86e9d267629758adaba18579e784ddd63c32", "status": "affected", "versionType": "git" }, { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "c7acfb04c7e2e2dea248282b21373d93296644dd", "status": "affected", "versionType": "git" }, { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "baa320fbb2f9fea50f5632a307da8ce84fbef5bd", "status": "affected", "versionType": "git" }, { "version": "a0b0fd53e1e67639b303b15939b9c653dbe7a8c4", "lessThan": "02c6be7d675b21d81f0ba3a524346850a8c0e3bf", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/locking/lockdep.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.111", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.7", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3-rc2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.12.111" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.2.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.3-rc2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f8a1281ab82df5b51fd0384354d4b21daf2b7af0" }, { "url": "https://git.kernel.org/stable/c/1c9d664e2e067fca69e5a41d68e23bbc66a583fe" }, { "url": "https://git.kernel.org/stable/c/6bc345f6d81ebe22e0f355c2a21d7e29691f9332" }, { "url": "https://git.kernel.org/stable/c/f63c86e9d267629758adaba18579e784ddd63c32" }, { "url": "https://git.kernel.org/stable/c/c7acfb04c7e2e2dea248282b21373d93296644dd" }, { "url": "https://git.kernel.org/stable/c/baa320fbb2f9fea50f5632a307da8ce84fbef5bd" }, { "url": "https://git.kernel.org/stable/c/02c6be7d675b21d81f0ba3a524346850a8c0e3bf" } ], "title": "locking/lockdep: Invalidate stale class_cache entries for zapped classes", "x_generator": { "engine": "bippy-1.2.0" } } } }