{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2023-54224", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-54224", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-12-30T12:11:18.076Z", "updatedAt": "2026-05-11T19:57:50.965Z", "importedAt": "2026-10-24T01:57:03.413Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "btrfs: fix lockdep splat and potential deadlock after failure running delayed items", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix lockdep splat and potential deadlock after failure running delayed items\n\nWhen running delayed items we are holding a delayed node's mutex and then\nwe will attempt to modify a subvolume btree to insert/update/delete the\ndelayed items. However if have an error during the insertions for example,\nbtrfs_insert_delayed_items() may return with a path that has locked extent\nbuffers (a leaf at the very least), and then we attempt to release the\ndelayed node at __btrfs_run_delayed_items(), which requires taking the\ndelayed node's mutex, causing an ABBA type of deadlock. This was reported\nby syzbot and the lockdep splat is the following:\n\n WARNING: possible circular locking dependency detected\n 6.5.0-rc7-syzkaller-00024-g93f5de5f648d #0 Not tainted\n ------------------------------------------------------\n syz-executor.2/13257 is trying to acquire lock:\n ffff88801835c0c0 (&delayed_node->mutex){+.+.}-{3:3}, at: __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256\n\n but task is already holding lock:\n ffff88802a5ab8e8 (btrfs-tree-00){++++}-{3:3}, at: __btrfs_tree_lock+0x3c/0x2a0 fs/btrfs/locking.c:198\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){++++}-{3:3}:\n __lock_release kernel/locking/lockdep.c:5475 [inline]\n lock_release+0x36f/0x9d0 kernel/locking/lockdep.c:5781\n up_write+0x79/0x580 kernel/locking/rwsem.c:1625\n btrfs_tree_unlock_rw fs/btrfs/locking.h:189 [inline]\n btrfs_unlock_up_safe+0x179/0x3b0 fs/btrfs/locking.c:239\n search_leaf fs/btrfs/ctree.c:1986 [inline]\n btrfs_search_slot+0x2511/0x2f80 fs/btrfs/ctree.c:2230\n btrfs_insert_empty_items+0x9c/0x180 fs/btrfs/ctree.c:4376\n btrfs_insert_delayed_item fs/btrfs/delayed-inode.c:746 [inline]\n btrfs_insert_delayed_items fs/btrfs/delayed-inode.c:824 [inline]\n __btrfs_commit_inode_delayed_items+0xd24/0x2410 fs/btrfs/delayed-inode.c:1111\n __btrfs_run_delayed_items+0x1db/0x430 fs/btrfs/delayed-inode.c:1153\n flush_space+0x269/0xe70 fs/btrfs/space-info.c:723\n btrfs_async_reclaim_metadata_space+0x106/0x350 fs/btrfs/space-info.c:1078\n process_one_work+0x92c/0x12c0 kernel/workqueue.c:2600\n worker_thread+0xa63/0x1210 kernel/workqueue.c:2751\n kthread+0x2b8/0x350 kernel/kthread.c:389\n ret_from_fork+0x2e/0x60 arch/x86/kernel/process.c:145\n ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304\n\n -> #0 (&delayed_node->mutex){+.+.}-{3:3}:\n check_prev_add kernel/locking/lockdep.c:3142 [inline]\n check_prevs_add kernel/locking/lockdep.c:3261 [inline]\n validate_chain kernel/locking/lockdep.c:3876 [inline]\n __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5144\n lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5761\n __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603\n __mutex_lock kernel/locking/mutex.c:747 [inline]\n mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799\n __btrfs_release_delayed_node+0x9a/0xaa0 fs/btrfs/delayed-inode.c:256\n btrfs_release_delayed_node fs/btrfs/delayed-inode.c:281 [inline]\n __btrfs_run_delayed_items+0x2b5/0x430 fs/btrfs/delayed-inode.c:1156\n btrfs_commit_transaction+0x859/0x2ff0 fs/btrfs/transaction.c:2276\n btrfs_sync_file+0xf56/0x1330 fs/btrfs/file.c:1988\n vfs_fsync_range fs/sync.c:188 [inline]\n vfs_fsync fs/sync.c:202 [inline]\n do_fsync fs/sync.c:212 [inline]\n __do_sys_fsync fs/sync.c:220 [inline]\n __se_sys_fsync fs/sync.c:218 [inline]\n __x64_sys_fsync+0x196/0x1e0 fs/sync.c:218\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n other info that\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "506650dcb3a716ad98681f7091ba2f8e748c04b8", "status": "affected", "versionType": "git", "lessThan": "779c3cf2749c7a7bad6f839cb2954a25ba92f4d6" }, { "version": "506650dcb3a716ad98681f7091ba2f8e748c04b8", "status": "affected", "versionType": "git", "lessThan": "32247b9526bfdaeef85f7339d9b4f913c7370f92" }, { "version": "506650dcb3a716ad98681f7091ba2f8e748c04b8", "status": "affected", "versionType": "git", "lessThan": "36d918da3f1bf749178c7daf471a3be1730ed3ca" }, { "version": "506650dcb3a716ad98681f7091ba2f8e748c04b8", "status": "affected", "versionType": "git", "lessThan": "e110f8911ddb93e6f55da14ccbbe705397b30d0b" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.15" }, { "version": "5.15.133", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.55", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.5.5", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.5.*" }, { "version": "6.6", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }