{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23036", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.943Z", "datePublished": "2026-01-31T11:42:30.782Z", "dateUpdated": "2026-01-31T11:42:30.782Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-01-31T11:42:30.782Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: release path before iget_failed() in btrfs_read_locked_inode()\n\nIn btrfs_read_locked_inode() if we fail to lookup the inode, we jump to\nthe 'out' label with a path that has a read locked leaf and then we call\niget_failed(). This can result in a ABBA deadlock, since iget_failed()\ntriggers inode eviction and that causes the release of the delayed inode,\nwhich must lock the delayed inode's mutex, and a task updating a delayed\ninode starts by taking the node's mutex and then modifying the inode's\nsubvolume btree.\n\nSyzbot reported the following lockdep splat for this:\n\n ======================================================\n WARNING: possible circular locking dependency detected\n syzkaller #0 Not tainted\n ------------------------------------------------------\n btrfs-cleaner/8725 is trying to acquire lock:\n ffff0000d6826a48 (&delayed_node->mutex){+.+.}-{4:4}, at: __btrfs_release_delayed_node+0xa0/0x9b0 fs/btrfs/delayed-inode.c:290\n\n but task is already holding lock:\n ffff0000dbeba878 (btrfs-tree-00){++++}-{4:4}, at: btrfs_tree_read_lock_nested+0x44/0x2ec fs/btrfs/locking.c:145\n\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n\n -> #1 (btrfs-tree-00){++++}-{4:4}:\n __lock_release kernel/locking/lockdep.c:5574 [inline]\n lock_release+0x198/0x39c kernel/locking/lockdep.c:5889\n up_read+0x24/0x3c kernel/locking/rwsem.c:1632\n btrfs_tree_read_unlock+0xdc/0x298 fs/btrfs/locking.c:169\n btrfs_tree_unlock_rw fs/btrfs/locking.h:218 [inline]\n btrfs_search_slot+0xa6c/0x223c fs/btrfs/ctree.c:2133\n btrfs_lookup_inode+0xd8/0x38c fs/btrfs/inode-item.c:395\n __btrfs_update_delayed_inode+0x124/0xed0 fs/btrfs/delayed-inode.c:1032\n btrfs_update_delayed_inode fs/btrfs/delayed-inode.c:1118 [inline]\n __btrfs_commit_inode_delayed_items+0x15f8/0x1748 fs/btrfs/delayed-inode.c:1141\n __btrfs_run_delayed_items+0x1ac/0x514 fs/btrfs/delayed-inode.c:1176\n btrfs_run_delayed_items_nr+0x28/0x38 fs/btrfs/delayed-inode.c:1219\n flush_space+0x26c/0xb68 fs/btrfs/space-info.c:828\n do_async_reclaim_metadata_space+0x110/0x364 fs/btrfs/space-info.c:1158\n btrfs_async_reclaim_metadata_space+0x90/0xd8 fs/btrfs/space-info.c:1226\n process_one_work+0x7e8/0x155c kernel/workqueue.c:3263\n process_scheduled_works kernel/workqueue.c:3346 [inline]\n worker_thread+0x958/0xed8 kernel/workqueue.c:3427\n kthread+0x5fc/0x75c kernel/kthread.c:463\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844\n\n -> #0 (&delayed_node->mutex){+.+.}-{4:4}:\n check_prev_add kernel/locking/lockdep.c:3165 [inline]\n check_prevs_add kernel/locking/lockdep.c:3284 [inline]\n validate_chain kernel/locking/lockdep.c:3908 [inline]\n __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237\n lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868\n __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598\n __mutex_lock kernel/locking/mutex.c:760 [inline]\n mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812\n __btrfs_release_delayed_node+0xa0/0x9b0 fs/btrfs/delayed-inode.c:290\n btrfs_release_delayed_node fs/btrfs/delayed-inode.c:315 [inline]\n btrfs_remove_delayed_node+0x68/0x84 fs/btrfs/delayed-inode.c:1326\n btrfs_evict_inode+0x578/0xe28 fs/btrfs/inode.c:5587\n evict+0x414/0x928 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput+0x95c/0xad4 fs/inode.c:1966\n iget_failed+0xec/0x134 fs/bad_inode.c:248\n btrfs_read_locked_inode+0xe1c/0x1234 fs/btrfs/inode.c:4101\n btrfs_iget+0x1b0/0x264 fs/btrfs/inode.c:5837\n btrfs_run_defrag_inode fs/btrfs/defrag.c:237 [inline]\n btrfs_run_defrag_inodes+0x520/0xdc4 fs/btrf\n---truncated---"}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/inode.c"], "versions": [{"version": "69673992b1aea5540199d9b8b658ede72f55a6cf", "lessThan": "65241e3ddda60b53a4ee3ae12721fc9ee21d5827", "status": "affected", "versionType": "git"}, {"version": "69673992b1aea5540199d9b8b658ede72f55a6cf", "lessThan": "1e1f2055ad5a7a5d548789b334a4473a7665c418", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/btrfs/inode.c"], "versions": [{"version": "6.13", "status": "affected"}, {"version": "0", "lessThan": "6.13", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.7", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19-rc6", "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": "6.13", "versionEndExcluding": "6.18.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.19-rc6"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/65241e3ddda60b53a4ee3ae12721fc9ee21d5827"}, {"url": "https://git.kernel.org/stable/c/1e1f2055ad5a7a5d548789b334a4473a7665c418"}], "title": "btrfs: release path before iget_failed() in btrfs_read_locked_inode()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: release path before iget_failed() in btrfs_read_locked_inode()\n\nIn btrfs_read_locked_inode() if we fail to lookup the inode, we jump to\nthe 'out' label with a path that has a read locked leaf and then we call\niget_failed(). This can result in a ABBA deadlock, since iget_failed()\ntriggers inode eviction and that causes the release of the delayed inode,\nwhich must lock the delayed inode's mutex, and a task updating a delayed\ninode starts by taking the node's mutex and then modifying the inode's\nsubvolume btree.\n\nSyzbot reported the following lockdep splat for this:\n\n ======================================================\n WARNING: possible circular locking dependency detected\n syzkaller #0 Not tainted\n ------------------------------------------------------\n btrfs-cleaner/8725 is trying to acquire lock:\n ffff0000d6826a48 (&delayed_node->mutex){+.+.}-{4:4}, at: __btrfs_release_delayed_node+0xa0/0x9b0 fs/btrfs/delayed-inode.c:290\n\n but task is already holding lock:\n ffff0000dbeba878 (btrfs-tree-00){++++}-{4:4}, at: btrfs_tree_read_lock_nested+0x44/0x2ec fs/btrfs/locking.c:145\n\n which lock already depends on the new lock.\n\n the existing dependency chain (in reverse order) is:\n\n -> #1 (btrfs-tree-00){++++}-{4:4}:\n __lock_release kernel/locking/lockdep.c:5574 [inline]\n lock_release+0x198/0x39c kernel/locking/lockdep.c:5889\n up_read+0x24/0x3c kernel/locking/rwsem.c:1632\n btrfs_tree_read_unlock+0xdc/0x298 fs/btrfs/locking.c:169\n btrfs_tree_unlock_rw fs/btrfs/locking.h:218 [inline]\n btrfs_search_slot+0xa6c/0x223c fs/btrfs/ctree.c:2133\n btrfs_lookup_inode+0xd8/0x38c fs/btrfs/inode-item.c:395\n __btrfs_update_delayed_inode+0x124/0xed0 fs/btrfs/delayed-inode.c:1032\n btrfs_update_delayed_inode fs/btrfs/delayed-inode.c:1118 [inline]\n __btrfs_commit_inode_delayed_items+0x15f8/0x1748 fs/btrfs/delayed-inode.c:1141\n __btrfs_run_delayed_items+0x1ac/0x514 fs/btrfs/delayed-inode.c:1176\n btrfs_run_delayed_items_nr+0x28/0x38 fs/btrfs/delayed-inode.c:1219\n flush_space+0x26c/0xb68 fs/btrfs/space-info.c:828\n do_async_reclaim_metadata_space+0x110/0x364 fs/btrfs/space-info.c:1158\n btrfs_async_reclaim_metadata_space+0x90/0xd8 fs/btrfs/space-info.c:1226\n process_one_work+0x7e8/0x155c kernel/workqueue.c:3263\n process_scheduled_works kernel/workqueue.c:3346 [inline]\n worker_thread+0x958/0xed8 kernel/workqueue.c:3427\n kthread+0x5fc/0x75c kernel/kthread.c:463\n ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:844\n\n -> #0 (&delayed_node->mutex){+.+.}-{4:4}:\n check_prev_add kernel/locking/lockdep.c:3165 [inline]\n check_prevs_add kernel/locking/lockdep.c:3284 [inline]\n validate_chain kernel/locking/lockdep.c:3908 [inline]\n __lock_acquire+0x1774/0x30a4 kernel/locking/lockdep.c:5237\n lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5868\n __mutex_lock_common+0x1d0/0x2678 kernel/locking/mutex.c:598\n __mutex_lock kernel/locking/mutex.c:760 [inline]\n mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:812\n __btrfs_release_delayed_node+0xa0/0x9b0 fs/btrfs/delayed-inode.c:290\n btrfs_release_delayed_node fs/btrfs/delayed-inode.c:315 [inline]\n btrfs_remove_delayed_node+0x68/0x84 fs/btrfs/delayed-inode.c:1326\n btrfs_evict_inode+0x578/0xe28 fs/btrfs/inode.c:5587\n evict+0x414/0x928 fs/inode.c:810\n iput_final fs/inode.c:1914 [inline]\n iput+0x95c/0xad4 fs/inode.c:1966\n iget_failed+0xec/0x134 fs/bad_inode.c:248\n btrfs_read_locked_inode+0xe1c/0x1234 fs/btrfs/inode.c:4101\n btrfs_iget+0x1b0/0x264 fs/btrfs/inode.c:5837\n btrfs_run_defrag_inode fs/btrfs/defrag.c:237 [inline]\n btrfs_run_defrag_inodes+0x520/0xdc4 fs/btrf\n---truncated---"}], "id": "CVE-2026-23036", "lastModified": "2026-01-31T12:16:06.910", "metrics": {}, "published": "2026-01-31T12:16:06.910", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1e1f2055ad5a7a5d548789b334a4473a7665c418"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/65241e3ddda60b53a4ee3ae12721fc9ee21d5827"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{}