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CVE-2026-23267

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

f2fs: fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic commit and checkpoint writes

During SPO tests, when mounting F2FS, an -EINVAL error was returned from f2fs_recover_inode_page. The issue occurred under the following scenario

Thread A calls f2fs_need_dentry_mark(sbi, ino), and the last_folio has already been written once. However, the {struct nat_entry}->flag did not have the IS_CHECKPOINTED set, causing set_dentry_mark(last_folio, 1) and write last_folio again after Thread B finishes f2fs_write_checkpoint.

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After SPO and reboot, it was detected that {struct node_info}->blk_addr was not NULL_ADDR because Thread B successfully write the checkpoint.

This issue only occurs in atomic write scenarios. For regular file fsync operations, the folio must be dirty. If block_operations->f2fs_sync_node_pages successfully submit the folio write, this path will not be executed. Otherwise, the f2fs_write_checkpoint will need to wait for the folio write submission to complete, as sbi->nr_pages[F2FS_DIRTY_NODES] > 0. Therefore, the situation where f2fs_need_dentry_mark checks that the {struct nat_entry}->flag /wo the IS_CHECKPOINTED flag, but the folio write has already been submitted, will not occur.

Therefore, for atomic file fsync, sbi->node_write should be acquired through __write_node_folio to ensure that the IS_CHECKPOINTED flag correctly indicates that the checkpoint write has been completed.

Detalles técnicos trazas, registros y código del informe original
Thread A                                     Thread B
f2fs_ioc_commit_atomic_write
 - f2fs_do_sync_file // atomic = true
  - f2fs_fsync_node_pages
    : last_folio = inode folio
    : schedule before folio_lock(last_folio) f2fs_write_checkpoint
                                              - block_operations// writeback last_folio
                                              - schedule before f2fs_flush_nat_entries
    : set_fsync_mark(last_folio, 1)
    : set_dentry_mark(last_folio, 1)
    : folio_mark_dirty(last_folio)
    - __write_node_folio(last_folio)
      : f2fs_down_read(&sbi->node_write)//block
                                              - f2fs_flush_nat_entries
                                                : {struct nat_entry}->flag |= BIT(IS_CHECKPOINTED)
                                              - unblock_operations
                                                : f2fs_up_write(&sbi->node_write)
                                             f2fs_write_checkpoint//return
      : f2fs_do_write_node_page()
f2fs_ioc_commit_atomic_write//return
                                             SPO

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2026-23267",
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        "source": "nvd@nist.gov",
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          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic commit and checkpoint writes\n\nDuring SPO tests, when mounting F2FS, an -EINVAL error was returned from\nf2fs_recover_inode_page. The issue occurred under the following scenario\n\nThread A                                     Thread B\nf2fs_ioc_commit_atomic_write\n - f2fs_do_sync_file // atomic = true\n  - f2fs_fsync_node_pages\n    : last_folio = inode folio\n    : schedule before folio_lock(last_folio) f2fs_write_checkpoint\n                                              - block_operations// writeback last_folio\n                                              - schedule before f2fs_flush_nat_entries\n    : set_fsync_mark(last_folio, 1)\n    : set_dentry_mark(last_folio, 1)\n    : folio_mark_dirty(last_folio)\n    - __write_node_folio(last_folio)\n      : f2fs_down_read(&sbi->node_write)//block\n                                              - f2fs_flush_nat_entries\n                                                : {struct nat_entry}->flag |= BIT(IS_CHECKPOINTED)\n                                              - unblock_operations\n                                                : f2fs_up_write(&sbi->node_write)\n                                             f2fs_write_checkpoint//return\n      : f2fs_do_write_node_page()\nf2fs_ioc_commit_atomic_write//return\n                                             SPO\n\nThread A calls f2fs_need_dentry_mark(sbi, ino), and the last_folio has\nalready been written once. However, the {struct nat_entry}->flag did not\nhave the IS_CHECKPOINTED set, causing set_dentry_mark(last_folio, 1) and\nwrite last_folio again after Thread B finishes f2fs_write_checkpoint.\n\nAfter SPO and reboot, it was detected that {struct node_info}->blk_addr\nwas not NULL_ADDR because Thread B successfully write the checkpoint.\n\nThis issue only occurs in atomic write scenarios. For regular file\nfsync operations, the folio must be dirty. If\nblock_operations->f2fs_sync_node_pages successfully submit the folio\nwrite, this path will not be executed. Otherwise, the\nf2fs_write_checkpoint will need to wait for the folio write submission\nto complete, as sbi->nr_pages[F2FS_DIRTY_NODES] > 0. Therefore, the\nsituation where f2fs_need_dentry_mark checks that the {struct\nnat_entry}->flag /wo the IS_CHECKPOINTED flag, but the folio write has\nalready been submitted, will not occur.\n\nTherefore, for atomic file fsync, sbi->node_write should be acquired\nthrough __write_node_folio to ensure that the IS_CHECKPOINTED flag\ncorrectly indicates that the checkpoint write has been completed."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nf2fs: corrige el problema de inconsistencia del flag IS_CHECKPOINTED causado por escrituras concurrentes de commit atómico y checkpoint\n\nDurante las pruebas SPO, al montar F2FS, se devolvió un error -EINVAL desde\nf2fs_recover_inode_page. El problema ocurrió bajo el siguiente escenario\n\nHilo A                                     Hilo B\nf2fs_ioc_commit_atomic_write\n - f2fs_do_sync_file // atómico = true\n  - f2fs_fsync_node_pages\n    : last_folio = inode folio\n    : schedule before folio_lock(last_folio) f2fs_write_checkpoint\n                                              - block_operations// writeback last_folio\n                                              - schedule before f2fs_flush_nat_entries\n    : set_fsync_mark(last_folio, 1)\n    : set_dentry_mark(last_folio, 1)\n    : folio_mark_dirty(last_folio)\n    - __write_node_folio(last_folio)\n      : f2fs_down_read(&sbi->node_write)//bloquea\n                                              - f2fs_flush_nat_entries\n                                                : {struct nat_entry}->flag |= BIT(IS_CHECKPOINTED)\n                                              - unblock_operations\n                                                : f2fs_up_write(&sbi->node_write)\n                                             f2fs_write_checkpoint//retorna\n      : f2fs_do_write_node_page()\nf2fs_ioc_commit_atomic_write//retorna\n                                             SPO\n\nEl Hilo A llama a f2fs_need_dentry_mark(sbi, ino), y el last_folio ya ha\nsido escrito una vez. Sin embargo, el {struct nat_entry}->flag no tenía\nel IS_CHECKPOINTED establecido, causando que set_dentry_mark(last_folio, 1) y\nse escriba last_folio de nuevo después de que el Hilo B termine f2fs_write_checkpoint.\n\nDespués de SPO y el reinicio, se detectó que {struct node_info}->blk_addr\nno era NULL_ADDR porque el Hilo B escribió exitosamente el checkpoint.\n\nEste problema solo ocurre en escenarios de escritura atómica. Para operaciones\nfsync de archivos regulares, el folio debe estar sucio. Si\nblock_operations->f2fs_sync_node_pages envía exitosamente la escritura del folio,\nesta ruta no se ejecutará. De lo contrario, f2fs_write_checkpoint deberá esperar\na que se complete el envío de la escritura del folio, ya que\nsbi->nr_pages[F2FS_DIRTY_NODES] > 0. Por lo tanto, la situación en la que\nf2fs_need_dentry_mark verifica que el {struct nat_entry}->flag sin el flag\nIS_CHECKPOINTED, pero la escritura del folio ya ha sido enviada, no ocurrirá.\n\nPor lo tanto, para fsync de archivos atómicos, sbi->node_write debe adquirirse\na través de __write_node_folio para asegurar que el flag IS_CHECKPOINTED\nindique correctamente que la escritura del checkpoint ha sido completada."
    }
  ],
  "lastModified": "2026-06-17T10:21:13.140",
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