CVE-2026-46061: Linux

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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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Linux Linux: f1c5aa614b5c251f93a6a4c8c26001d5e9e53fd6 преди dff07cc98fdf6af57a7c054dc09b2050a9d5c287; f76d4c28a46a9260d85e00dafc8f46d369365d33 преди 2b2fee890250ab647a601124471a334bb01a0790; f76d4c28a46a9260d85e00dafc8f46d369365d33 преди bbd943d6a2d566428324b516a37f98328dfb802d; f76d4c28a46a9260d85e00dafc8f46d369365d33 преди 981fcc5674e67158d24d23e841523eccba19d0e7; 1bb7a4b6b3d7dd8da6f5a9d0529d42c22a359e71; 6.12.31 преди 6.12.86; 6.14.9 преди 6.15
Linux Linux: 6.15; преди 6.15; 6.12.86 до 6.12.*; 6.18.27 до 6.18.*; 7.0.4 до 7.0.*; от 7.1 нататък

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27 май 2026 Публикувано

CVE-2026-46061: Linux

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