Description
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix circular locking dependency in ocfs2_dio_end_io_write
A circular locking dependency involves INODE_ALLOC_SYSTEM_INODE, EXTENT_ALLOC_SYSTEM_INODE, and ORPHAN_DIR_SYSTEM_INODE.
1. ocfs2_mknod() acquires INODE_ALLOC then EXTENT_ALLOC.
2. ocfs2_dio_end_io_write() acquires EXTENT_ALLOC for unwritten extents, then ORPHAN_DIR via ocfs2_del_inode_from_orphan() while still holding EXTENT_ALLOC.
3. ocfs2_wipe_inode() acquires ORPHAN_DIR then INODE_ALLOC via ocfs2_remove_inode.
Break the cycle in ocfs2_dio_end_io_write() by freeing the allocation contexts (releasing EXTENT_ALLOC) before acquiring ORPHAN_DIR.
WARNING: possible circular locking dependency detected ------------------------------------------------------ is trying to acquire lock: ffff8881e78b33a0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0x1539/0x43b0 fs/ocfs2/inode.c:1299
but task is already holding lock: ffff8881e78b4fa0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0xe97/0x43b0 fs/ocfs2/inode.c:1299
the existing dependency chain (in reverse order) is:
-> #2 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}: inode_lock include/linux/fs.h:1029 [inline] ocfs2_del_inode_from_orphan+0x12e/0x7a0 fs/ocfs2/namei.c:2728 ocfs2_dio_end_io+0xf9c/0x1370 fs/ocfs2/aops.c:2418 dio_complete+0x25b/0x790 fs/direct-io.c:281
-> #1 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}: inode_lock include/linux/fs.h:1029 [inline] ocfs2_reserve_suballoc_bits+0x16d/0x4840 fs/ocfs2/suballoc.c:882 ocfs2_reserve_new_metadata_blocks+0x415/0x9a0 fs/ocfs2/suballoc.c:1078 ocfs2_mknod+0x10f3/0x2260 fs/ocfs2/namei.c:351
-> #0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}: __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868 down_write+0x96/0x200 kernel/locking/rwsem.c:1625 inode_lock include/linux/fs.h:1029 [inline] ocfs2_remove_inode fs/ocfs2/inode.c:733 [inline] ocfs2_wipe_inode fs/ocfs2/inode.c:896 [inline] ocfs2_delete_inode fs/ocfs2/inode.c:1157 [inline] ocfs2_evict_inode+0x1539/0x43b0 fs/ocfs2/inode.c:1299
Chain exists of: &ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE] --> &ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE] --> &ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]
Possible unsafe locking scenario:
CPU0 CPU1 ---- ---- lock(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]); lock(&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]); lock(&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]); lock(&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]);
*** DEADLOCK ***
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 97c03c0e9f73a5049794b3c69ee60fb5e8b0ebd8, < f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990; >= 1e99bb19994246514d63e656492904176f9d5edd, < 137e8b4823a9a11928428d4ec0a0cacb2f50a769; >= 91e05ac2336d00d5b99fc774be4bd50039084796, < 4273548e418bd935430d35e9d052870f323441f3; >= 886f97fa59d0bbfa9859fb1a66dd9e014b522d89, < 49b34bd3ad69611af03590a23abf2cda9ac1073d; >= ea5bb1d20da756e4f41a48dad42b2e7d6e73f71e, < ff187c502b39389b0d732cb7050a3db8e5ebfcd6; >= 3c636a3edca9c3f180b3079f94fe7e115730d9c6, < ae1f3460833d3e427420ab260278ec0e45d68c86; >= d647c5b2fbf81560818dacade360abc8c00a9665, < f3dd1e534e9de64669415f8239e0094afecfed78; >= d647c5b2fbf81560818dacade360abc8c00a9665, < ff6f26c58421614b02694ac9d219ac61d924bc68; 069c3fb310e9336cf48cfdf8748a32c29fd0193d; >= 5.10.258, < 5.10.261; >= 5.15.209, < 5.15.212; >= 6.1.175, < 6.1.178; >= 6.6.140, < 6.6.145; >= 6.12.86, < 6.12.97; >= 6.18.27, < 6.18.40; >= 7.0.4, < 7.1 |
| Linux | Linux | 7.1 |
References
- https://git.kernel.org/stable/c/137e8b4823a9a11928428d4ec0a0cacb2f50a769
- https://git.kernel.org/stable/c/4273548e418bd935430d35e9d052870f323441f3
- https://git.kernel.org/stable/c/49b34bd3ad69611af03590a23abf2cda9ac1073d
- https://git.kernel.org/stable/c/ae1f3460833d3e427420ab260278ec0e45d68c86
- https://git.kernel.org/stable/c/f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990
- https://git.kernel.org/stable/c/f3dd1e534e9de64669415f8239e0094afecfed78
- https://git.kernel.org/stable/c/ff187c502b39389b0d732cb7050a3db8e5ebfcd6
- https://git.kernel.org/stable/c/ff6f26c58421614b02694ac9d219ac61d924bc68
Timeline
- Published
- Sep 4, 2026
- Last modified
- Sep 4, 2026
- NVD status
- Received