{"id":"CVE-2025-71194","revision":null,"records":[{"revision":"4ab099c931fc47a5b130edc94d035cb5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-71194","aliases":[],"title":"btrfs: fix deadlock in wait_current_trans() due to ignored transaction type","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock in wait_current_trans() due to ignored transaction type\n\nWhen wait_current_trans() is called during start_transaction(), it\ncurrently waits for a blocked transaction without considering whether\nthe given transaction type actually needs to wait for that particular\ntransaction state. The btrfs_blocked_trans_types[] array already defines\nwhich transaction types should wait for which transaction states, but\nthis check was missing in wait_current_trans().\n\nThis can lead to a deadlock scenario involving two transactions and\npending ordered extents:\n\n 1. Transaction A is in TRANS_STATE_COMMIT_DOING state\n\n 2. A worker processing an ordered extent calls start_transaction()\n with TRANS_JOIN\n\n 3. join_transaction() returns -EBUSY because Transaction A is in\n TRANS_STATE_COMMIT_DOING\n\n 4. Transaction A moves to TRANS_STATE_UNBLOCKED and completes\n\n 5. A new Transaction B is created (TRANS_STATE_RUNNING)\n\n 6. The ordered extent from step 2 is added to Transaction B's\n pending ordered extents\n\n 7. Transaction B immediately starts commit by another task and\n enters TRANS_STATE_COMMIT_START\n\n 8. The worker finally reaches wait_current_trans(), sees Transaction B\n in TRANS_STATE_COMMIT_START (a blocked state), and waits\n unconditionally\n\n 9. However, TRANS_JOIN should NOT wait for TRANS_STATE_COMMIT_START\n according to btrfs_blocked_trans_types[]\n\n 10. Transaction B is waiting for pending ordered extents to complete\n\n 11. Deadlock: Transaction B waits for ordered extent, ordered extent\n waits for Transaction B\n\nThis can be illustrated by the following call stacks:\n CPU0 CPU1\n btrfs_finish_ordered_io()\n start_transaction(TRANS_JOIN)\n join_transaction()\n # -EBUSY (Transaction A is\n # TRANS_STATE_COMMIT_DOING)\n # Transaction A completes\n # Transaction B created\n # ordered extent added to\n # Transaction B's pending list\n btrfs_commit_transaction()\n # Transaction B enters\n # TRANS_STATE_COMMIT_START\n # waiting for pending ordered\n # extents\n wait_current_trans()\n # waits for Transaction B\n # (should not wait!)\n\nTask bstore_kv_sync in btrfs_commit_transaction waiting for ordered\nextents:\n\n __schedule+0x2e7/0x8a0\n schedule+0x64/0xe0\n btrfs_commit_transaction+0xbf7/0xda0 [btrfs]\n btrfs_sync_file+0x342/0x4d0 [btrfs]\n __x64_sys_fdatasync+0x4b/0x80\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nTask kworker in wait_current_trans waiting for transaction commit:\n\n Workqueue: btrfs-syno_nocow btrfs_work_helper [btrfs]\n __schedule+0x2e7/0x8a0\n schedule+0x64/0xe0\n wait_current_trans+0xb0/0x110 [btrfs]\n start_transaction+0x346/0x5b0 [btrfs]\n btrfs_finish_ordered_io.isra.0+0x49b/0x9c0 [btrfs]\n btrfs_work_helper+0xe8/0x350 [btrfs]\n process_one_work+0x1d3/0x3c0\n worker_thread+0x4d/0x3e0\n kthread+0x12d/0x150\n ret_from_fork+0x1f/0x30\n\nFix this by passing the transaction type to wait_current_trans() and\nchecking btrfs_blocked_trans_types[cur_trans->state] against the given\ntype before deciding to wait. This ensures that transaction types which\nare allowed to join during certain blocked states will not unnecessarily\nwait and cause deadlocks.","state":0,"publishedAt":"2026-02-04T16:04:15.389+00:00","modifiedAt":"2026-10-19T18:25:23.853+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/btrfs/transaction.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"e563f59395981fcd69d130761290929806e728d6\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"dc84036c173cff6a432d9ab926298850b1d2a659\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"d7b04b40ac8e6d814e35202a0e1568809b818295\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"99da896614d17e8a84aeb2b2d464ac046cc8633d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"8b0bb145d3bc264360f525c9717653be3522e528\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"9ac63333d600732a56b35ee1fa46836da671eb50\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"4a9d8bdee368de78ace8b36da4eb2186afea162d\",\n \"lessThan\": \"5037b342825df7094a4906d1e2a9674baab50cb2\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"fs/btrfs/transaction.c\"\n ],\n \"versions\": [\n {\n \"version\": \"3.11\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"3.11\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.249\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.199\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.162\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.122\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.67\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.7\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.19\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/e563f59395981fcd69d130761290929806e728d6","https://git.kernel.org/stable/c/dc84036c173cff6a432d9ab926298850b1d2a659","https://git.kernel.org/stable/c/d7b04b40ac8e6d814e35202a0e1568809b818295","https://git.kernel.org/stable/c/99da896614d17e8a84aeb2b2d464ac046cc8633d","https://git.kernel.org/stable/c/8b0bb145d3bc264360f525c9717653be3522e528","https://git.kernel.org/stable/c/9ac63333d600732a56b35ee1fa46836da671eb50","https://git.kernel.org/stable/c/5037b342825df7094a4906d1e2a9674baab50cb2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-71194","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-71194","identifiers":["CVE-2025-71194"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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