{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46061",
  "modified": "2026-10-07T14:35:31Z",
  "upstream": [
    "CVE-2026-46061"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "jbd2: fix deadlock in jbd2_journal_cancel_revoke()",
  "details": "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 -> buffer) and\ncauses an ABBA deadlock when the filesystem blocksize < pagesize:\n\n     T1                                T2\next4_mkdir()\n ext4_init_new_dir()\n  ext4_append()\n   ext4_getblk()\n    lock_buffer()    <- A\n                                   sync_blockdev()\n                                    blkdev_writepages()\n                                     writeback_iter()\n                                      writeback_get_folio()\n                                       folio_lock()   <- B\n     ext4_journal_get_create_access()\n      jbd2_journal_cancel_revoke()\n       __find_get_block_nonatomic()\n        folio_lock()  <- B\n                                     block_write_full_folio()\n                                      lock_buffer()   <- 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't 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.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-46061"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/dff07cc98fdf6af57a7c054dc09b2050a9d5c287"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2b2fee890250ab647a601124471a334bb01a0790"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bbd943d6a2d566428324b516a37f98328dfb802d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/981fcc5674e67158d24d23e841523eccba19d0e7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-06-15T02:03:26Z"
  }
}