CVE-2026-46061 (GCVE-0-2026-46061)
Vulnerability from cvelistv5
Published
2026-05-27 12:57
Modified
2026-06-14 17:51
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
Impacted products
Vendor Product Version
Linux Linux Version: f1c5aa614b5c251f93a6a4c8c26001d5e9e53fd6
Version: f76d4c28a46a9260d85e00dafc8f46d369365d33
Version: f76d4c28a46a9260d85e00dafc8f46d369365d33
Version: f76d4c28a46a9260d85e00dafc8f46d369365d33
Version: 1bb7a4b6b3d7dd8da6f5a9d0529d42c22a359e71
Version: 6.12.31   ≤
Version: 6.14.9   ≤
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{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
            "fs/jbd2/revoke.c"
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              "version": "7.0.4",
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              "version": "7.1",
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      "cpeApplicability": [
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              "operator": "OR"
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:51:27.666Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dff07cc98fdf6af57a7c054dc09b2050a9d5c287"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b2fee890250ab647a601124471a334bb01a0790"
        },
        {
          "url": "https://git.kernel.org/stable/c/bbd943d6a2d566428324b516a37f98328dfb802d"
        },
        {
          "url": "https://git.kernel.org/stable/c/981fcc5674e67158d24d23e841523eccba19d0e7"
        }
      ],
      "title": "jbd2: fix deadlock in jbd2_journal_cancel_revoke()",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46061",
    "datePublished": "2026-05-27T12:57:22.041Z",
    "dateReserved": "2026-05-13T15:03:33.095Z",
    "dateUpdated": "2026-06-14T17:51:27.666Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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