CVE-2026-80879 is a vulnerability in Linux Kernel
Published on September 4, 2026
ocfs2: fix circular locking dependency in ocfs2_dio_end_io_write
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 ***
Products Associated with CVE-2026-80879
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 97c03c0e9f73a5049794b3c69ee60fb5e8b0ebd8 and below f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990 is affected.
- Version 1e99bb19994246514d63e656492904176f9d5edd and below 137e8b4823a9a11928428d4ec0a0cacb2f50a769 is affected.
- Version 91e05ac2336d00d5b99fc774be4bd50039084796 and below 4273548e418bd935430d35e9d052870f323441f3 is affected.
- Version 886f97fa59d0bbfa9859fb1a66dd9e014b522d89 and below 49b34bd3ad69611af03590a23abf2cda9ac1073d is affected.
- Version ea5bb1d20da756e4f41a48dad42b2e7d6e73f71e and below ff187c502b39389b0d732cb7050a3db8e5ebfcd6 is affected.
- Version 3c636a3edca9c3f180b3079f94fe7e115730d9c6 and below ae1f3460833d3e427420ab260278ec0e45d68c86 is affected.
- Version d647c5b2fbf81560818dacade360abc8c00a9665 and below f3dd1e534e9de64669415f8239e0094afecfed78 is affected.
- Version d647c5b2fbf81560818dacade360abc8c00a9665 and below ff6f26c58421614b02694ac9d219ac61d924bc68 is affected.
- Version 069c3fb310e9336cf48cfdf8748a32c29fd0193d is affected.
- Version 5.10.258 and below 5.10.261 is affected.
- Version 5.15.209 and below 5.15.212 is affected.
- Version 6.1.175 and below 6.1.178 is affected.
- Version 6.6.140 and below 6.6.145 is affected.
- Version 6.12.86 and below 6.12.97 is affected.
- Version 6.18.27 and below 6.18.40 is affected.
- Version 7.0.4 and below 7.1 is affected.
- Version 7.1 is affected.
- Before 7.1 is unaffected.
- Version 5.10.261, <= 5.10.* is unaffected.
- Version 5.15.212, <= 5.15.* is unaffected.
- Version 6.1.178, <= 6.1.* is unaffected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.40, <= 6.18.* is unaffected.
- Version 7.1.5, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.