FKIE_CVE-2026-46061

Vulnerability from fkie_nvd - Published: 2026-05-27 14:17 - Updated: 2026-05-27 14:48
Severity
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b2fee890250ab647a601124471a334bb01a0790
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/981fcc5674e67158d24d23e841523eccba19d0e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bbd943d6a2d566428324b516a37f98328dfb802d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dff07cc98fdf6af57a7c054dc09b2050a9d5c287
Impacted products
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: fix deadlock in jbd2_journal_cancel_revoke()\n\nCommit f76d4c28a46a (\"fs/jbd2: use sleeping version of\n__find_get_block()\") changed jbd2_journal_cancel_revoke() to use\n__find_get_block_nonatomic() which holds the folio lock instead of\ni_private_lock. This breaks the lock ordering (folio -\u003e buffer) and\ncauses an ABBA deadlock when the filesystem blocksize \u003c pagesize:\n\n     T1                                T2\next4_mkdir()\n ext4_init_new_dir()\n  ext4_append()\n   ext4_getblk()\n    lock_buffer()    \u003c- A\n                                   sync_blockdev()\n                                    blkdev_writepages()\n                                     writeback_iter()\n                                      writeback_get_folio()\n                                       folio_lock()   \u003c- B\n     ext4_journal_get_create_access()\n      jbd2_journal_cancel_revoke()\n       __find_get_block_nonatomic()\n        folio_lock()  \u003c- B\n                                     block_write_full_folio()\n                                      lock_buffer()   \u003c- A\n\nThis can occasionally cause generic/013 to hang.\n\nFix by only calling __find_get_block_nonatomic() when the passed\nbuffer_head doesn\u0027t belong to the bdev, which is the only case that we\nneed to look up its bdev alias. Otherwise, the lookup is redundant since\nthe found buffer_head is equal to the one we passed in."
    }
  ],
  "id": "CVE-2026-46061",
  "lastModified": "2026-05-27T14:48:03.013",
  "metrics": {},
  "published": "2026-05-27T14:17:25.883",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b2fee890250ab647a601124471a334bb01a0790"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/981fcc5674e67158d24d23e841523eccba19d0e7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bbd943d6a2d566428324b516a37f98328dfb802d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/dff07cc98fdf6af57a7c054dc09b2050a9d5c287"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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