CVE-2026-80879 (GCVE-0-2026-80879)
Vulnerability from cvelistv5
Published
2026-09-04 16:49
Modified
2026-09-04 16:49
Severity ?
Summary
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 ***
References
Impacted products
Vendor Product Version
Linux Linux Version: 97c03c0e9f73a5049794b3c69ee60fb5e8b0ebd8
Version: 1e99bb19994246514d63e656492904176f9d5edd
Version: 91e05ac2336d00d5b99fc774be4bd50039084796
Version: 886f97fa59d0bbfa9859fb1a66dd9e014b522d89
Version: ea5bb1d20da756e4f41a48dad42b2e7d6e73f71e
Version: 3c636a3edca9c3f180b3079f94fe7e115730d9c6
Version: d647c5b2fbf81560818dacade360abc8c00a9665
Version: d647c5b2fbf81560818dacade360abc8c00a9665
Version: 069c3fb310e9336cf48cfdf8748a32c29fd0193d
Version: 5.10.258   ≤
Version: 5.15.209   ≤
Version: 6.1.175   ≤
Version: 6.6.140   ≤
Version: 6.12.86   ≤
Version: 6.18.27   ≤
Version: 7.0.4   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix circular locking dependency in ocfs2_dio_end_io_write\n\nA circular locking dependency involves INODE_ALLOC_SYSTEM_INODE,\nEXTENT_ALLOC_SYSTEM_INODE, and ORPHAN_DIR_SYSTEM_INODE.\n\n1. ocfs2_mknod() acquires INODE_ALLOC then EXTENT_ALLOC.\n\n2. ocfs2_dio_end_io_write() acquires EXTENT_ALLOC for unwritten\n   extents, then ORPHAN_DIR via ocfs2_del_inode_from_orphan() while still\n   holding EXTENT_ALLOC.\n\n3. ocfs2_wipe_inode() acquires ORPHAN_DIR then INODE_ALLOC via\n   ocfs2_remove_inode.\n\nBreak the cycle in ocfs2_dio_end_io_write() by freeing the allocation\ncontexts (releasing EXTENT_ALLOC) before acquiring ORPHAN_DIR.\n\nWARNING: possible circular locking dependency detected\n------------------------------------------------------\nis trying to acquire lock:\nffff8881e78b33a0\n(\u0026ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at:\nocfs2_evict_inode+0x1539/0x43b0 fs/ocfs2/inode.c:1299\n\nbut task is already holding lock:\nffff8881e78b4fa0\n(\u0026ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at:\nocfs2_evict_inode+0xe97/0x43b0 fs/ocfs2/inode.c:1299\n\nthe existing dependency chain (in reverse order) is:\n\n-\u003e #2 (\u0026ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}:\n       inode_lock include/linux/fs.h:1029 [inline]\n       ocfs2_del_inode_from_orphan+0x12e/0x7a0 fs/ocfs2/namei.c:2728\n       ocfs2_dio_end_io+0xf9c/0x1370 fs/ocfs2/aops.c:2418\n       dio_complete+0x25b/0x790 fs/direct-io.c:281\n\n-\u003e #1 (\u0026ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:\n       inode_lock include/linux/fs.h:1029 [inline]\n       ocfs2_reserve_suballoc_bits+0x16d/0x4840 fs/ocfs2/suballoc.c:882\n       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0\n       fs/ocfs2/suballoc.c:1078\n       ocfs2_mknod+0x10f3/0x2260 fs/ocfs2/namei.c:351\n\n-\u003e #0 (\u0026ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:\n       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237\n       lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868\n       down_write+0x96/0x200 kernel/locking/rwsem.c:1625\n       inode_lock include/linux/fs.h:1029 [inline]\n       ocfs2_remove_inode fs/ocfs2/inode.c:733 [inline]\n       ocfs2_wipe_inode fs/ocfs2/inode.c:896 [inline]\n       ocfs2_delete_inode fs/ocfs2/inode.c:1157 [inline]\n       ocfs2_evict_inode+0x1539/0x43b0 fs/ocfs2/inode.c:1299\n\nChain exists of:\n  \u0026ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE] --\u003e\n  \u0026ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE] --\u003e\n  \u0026ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]\n\n Possible unsafe locking scenario:\n\n       CPU0                    CPU1\n       ----                    ----\n  lock(\u0026ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]);\n                               lock(\u0026ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]);\n                               lock(\u0026ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]);\n  lock(\u0026ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]);\n\n *** DEADLOCK ***"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T16:49:02.905Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990"
        },
        {
          "url": "https://git.kernel.org/stable/c/137e8b4823a9a11928428d4ec0a0cacb2f50a769"
        },
        {
          "url": "https://git.kernel.org/stable/c/4273548e418bd935430d35e9d052870f323441f3"
        },
        {
          "url": "https://git.kernel.org/stable/c/49b34bd3ad69611af03590a23abf2cda9ac1073d"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff187c502b39389b0d732cb7050a3db8e5ebfcd6"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae1f3460833d3e427420ab260278ec0e45d68c86"
        },
        {
          "url": "https://git.kernel.org/stable/c/f3dd1e534e9de64669415f8239e0094afecfed78"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff6f26c58421614b02694ac9d219ac61d924bc68"
        }
      ],
      "title": "ocfs2: fix circular locking dependency in ocfs2_dio_end_io_write",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80879",
    "datePublished": "2026-09-04T16:49:02.905Z",
    "dateReserved": "2026-08-26T14:34:25.799Z",
    "dateUpdated": "2026-09-04T16:49:02.905Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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