{"id":"DEBIAN-CVE-2025-71194","details":"In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix deadlock in wait_current_trans() due to ignored transaction type  When wait_current_trans() is called during start_transaction(), it currently waits for a blocked transaction without considering whether the given transaction type actually needs to wait for that particular transaction state. The btrfs_blocked_trans_types[] array already defines which transaction types should wait for which transaction states, but this check was missing in wait_current_trans().  This can lead to a deadlock scenario involving two transactions and pending ordered extents:    1. Transaction A is in TRANS_STATE_COMMIT_DOING state    2. A worker processing an ordered extent calls start_transaction()      with TRANS_JOIN    3. join_transaction() returns -EBUSY because Transaction A is in      TRANS_STATE_COMMIT_DOING    4. Transaction A moves to TRANS_STATE_UNBLOCKED and completes    5. A new Transaction B is created (TRANS_STATE_RUNNING)    6. The ordered extent from step 2 is added to Transaction B's      pending ordered extents    7. Transaction B immediately starts commit by another task and      enters TRANS_STATE_COMMIT_START    8. The worker finally reaches wait_current_trans(), sees Transaction B      in TRANS_STATE_COMMIT_START (a blocked state), and waits      unconditionally    9. However, TRANS_JOIN should NOT wait for TRANS_STATE_COMMIT_START      according to btrfs_blocked_trans_types[]    10. Transaction B is waiting for pending ordered extents to complete    11. Deadlock: Transaction B waits for ordered extent, ordered extent       waits for Transaction B  This can be illustrated by the following call stacks:   CPU0                              CPU1                                     btrfs_finish_ordered_io()                                       start_transaction(TRANS_JOIN)                                         join_transaction()                                           # -EBUSY (Transaction A is                                           # TRANS_STATE_COMMIT_DOING)   # Transaction A completes   # Transaction B created   # ordered extent added to   # Transaction B's pending list   btrfs_commit_transaction()     # Transaction B enters     # TRANS_STATE_COMMIT_START     # waiting for pending ordered     # extents                                         wait_current_trans()                                           # waits for Transaction B                                           # (should not wait!)  Task bstore_kv_sync in btrfs_commit_transaction waiting for ordered extents:    __schedule+0x2e7/0x8a0   schedule+0x64/0xe0   btrfs_commit_transaction+0xbf7/0xda0 [btrfs]   btrfs_sync_file+0x342/0x4d0 [btrfs]   __x64_sys_fdatasync+0x4b/0x80   do_syscall_64+0x33/0x40   entry_SYSCALL_64_after_hwframe+0x44/0xa9  Task kworker in wait_current_trans waiting for transaction commit:    Workqueue: btrfs-syno_nocow btrfs_work_helper [btrfs]   __schedule+0x2e7/0x8a0   schedule+0x64/0xe0   wait_current_trans+0xb0/0x110 [btrfs]   start_transaction+0x346/0x5b0 [btrfs]   btrfs_finish_ordered_io.isra.0+0x49b/0x9c0 [btrfs]   btrfs_work_helper+0xe8/0x350 [btrfs]   process_one_work+0x1d3/0x3c0   worker_thread+0x4d/0x3e0   kthread+0x12d/0x150   ret_from_fork+0x1f/0x30  Fix this by passing the transaction type to wait_current_trans() and checking btrfs_blocked_trans_types[cur_trans-\u003estate] against the given type before deciding to wait. This ensures that transaction types which are allowed to join during certain blocked states will not unnecessarily wait and cause deadlocks.","modified":"2026-09-01T16:06:22.658558584Z","published":"2026-02-04T17:16:11.297Z","upstream":["CVE-2025-71194"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-71194"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.162-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-71194.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.69-1"}]}],"versions":["6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1~bpo12+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-71194.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.18.8-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-71194.json"}}],"schema_version":"1.9.0"}