UnratedFix available

jbd2: fix deadlock in jbd2_journal_cancel_revoke()

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: jbd2: fix deadlock in jbd2_journal_cancel_revoke() Commit f76d4c28a46a ("fs/jbd2: use sleeping version of __find_get_block()") changed jbd2_journal_cancel_revoke() to use __find_get_block_nonatomic() which holds the folio lock instead of i_private_lock. This breaks the lock ordering (folio -> buffer) and causes an ABBA deadlock when the filesystem blocksize < pagesize: T1 T2 ext4_mkdir() ext4_init_new_dir() ext4_append() ext4_getblk() lock_buffer() <- A sync_blockdev() blkdev_writepages() writeback_iter() writeback_get_folio() folio_lock() <- B ext4_journal_get_create_access() jbd2_journal_cancel_revoke() __find_get_block_nonatomic() folio_lock() <- B block_write_full_folio() lock_buffer() <- A This can occasionally cause generic/013 to hang. Fix by only calling __find_get_block_nonatomic() when the passed buffer_head doesn't belong to the bdev, which is the only case that we need to look up its bdev alias. Otherwise, the lookup is redundant since the found buffer_head is equal to the one we passed in.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.12.86, 6.18.27, 7.0.4
CVEs: CVE-2026-46061
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 16:58 UTC · Revision 1

Source evidence

jbd2: fix deadlock in jbd2_journal_cancel_revoke()

core-osv · Original source

Published 27 May 2026, 12:57 UTC

osv:CVE-2026-46061

Kernel

Fixed versions: 6.12.86, 6.18.27, 7.0.4

Complete source record

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  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "jbd2: fix deadlock in jbd2_journal_cancel_revoke()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: jbd2: fix deadlock in jbd2_journal_cancel_revoke() Commit f76d4c28a46a (\"fs/jbd2: use sleeping version of __find_get_block()\") changed jbd2_journal_cancel_revoke() to use __find_get_block_nonatomic() which holds the folio lock instead of i_private_lock. This breaks the lock ordering (folio -> buffer) and causes an ABBA deadlock when the filesystem blocksize < pagesize: T1 T2 ext4_mkdir() ext4_init_new_dir() ext4_append() ext4_getblk() lock_buffer() <- A sync_blockdev() blkdev_writepages() writeback_iter() writeback_get_folio() folio_lock() <- B ext4_journal_get_create_access() jbd2_journal_cancel_revoke() __find_get_block_nonatomic() folio_lock() <- B block_write_full_folio() lock_buffer() <- A This can occasionally cause generic/013 to hang. Fix by only calling __find_get_block_nonatomic() when the passed buffer_head doesn't belong to the bdev, which is the only case that we need to look up its bdev alias. Otherwise, the lookup is redundant since the found buffer_head is equal to the one we passed in.",
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      "modified": "2026-10-28T02:30:37.879298360Z",
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  "source_id": "core-osv",
  "document_id": 505021,
  "published_at": "2026-05-27T12:57:22.041+00:00"
}