FKIE_CVE-2026-23267

Vulnerability from fkie_nvd - Published: 2026-03-18 18:16 - Updated: 2026-05-29 18:41
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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 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 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. 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/32bc3c9fe18881d50dd51fd5f26d19fe1190dc0dPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/75e19da068adf0dc5dd269dd157392434b9117d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7633a7387eb4d0259d6bea945e1d3469cd135bbcPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/962c167b0f262b9962207fbeaa531721d55ea00ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd66b4c487d5091d2a65d6089e0de36f0c26a4c7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ed81bc5885460905f9160e7b463e5708fd056324Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "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(\u0026sbi-\u003enode_write)//block\n                                              - f2fs_flush_nat_entries\n                                                : {struct nat_entry}-\u003eflag |= BIT(IS_CHECKPOINTED)\n                                              - unblock_operations\n                                                : f2fs_up_write(\u0026sbi-\u003enode_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}-\u003eflag 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}-\u003eblk_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-\u003ef2fs_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-\u003enr_pages[F2FS_DIRTY_NODES] \u003e 0. Therefore, the\nsituation where f2fs_need_dentry_mark checks that the {struct\nnat_entry}-\u003eflag /wo the IS_CHECKPOINTED flag, but the folio write has\nalready been submitted, will not occur.\n\nTherefore, for atomic file fsync, sbi-\u003enode_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 at\u00f3mico y checkpoint\n\nDurante las pruebas SPO, al montar F2FS, se devolvi\u00f3 un error -EINVAL desde\nf2fs_recover_inode_page. El problema ocurri\u00f3 bajo el siguiente escenario\n\nHilo A                                     Hilo B\nf2fs_ioc_commit_atomic_write\n - f2fs_do_sync_file // at\u00f3mico = 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(\u0026amp;sbi-\u0026gt;node_write)//bloquea\n                                              - f2fs_flush_nat_entries\n                                                : {struct nat_entry}-\u0026gt;flag |= BIT(IS_CHECKPOINTED)\n                                              - unblock_operations\n                                                : f2fs_up_write(\u0026amp;sbi-\u0026gt;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}-\u0026gt;flag no ten\u00eda\nel IS_CHECKPOINTED establecido, causando que set_dentry_mark(last_folio, 1) y\nse escriba last_folio de nuevo despu\u00e9s de que el Hilo B termine f2fs_write_checkpoint.\n\nDespu\u00e9s de SPO y el reinicio, se detect\u00f3 que {struct node_info}-\u0026gt;blk_addr\nno era NULL_ADDR porque el Hilo B escribi\u00f3 exitosamente el checkpoint.\n\nEste problema solo ocurre en escenarios de escritura at\u00f3mica. Para operaciones\nfsync de archivos regulares, el folio debe estar sucio. Si\nblock_operations-\u0026gt;f2fs_sync_node_pages env\u00eda exitosamente la escritura del folio,\nesta ruta no se ejecutar\u00e1. De lo contrario, f2fs_write_checkpoint deber\u00e1 esperar\na que se complete el env\u00edo de la escritura del folio, ya que\nsbi-\u0026gt;nr_pages[F2FS_DIRTY_NODES] \u0026gt; 0. Por lo tanto, la situaci\u00f3n en la que\nf2fs_need_dentry_mark verifica que el {struct nat_entry}-\u0026gt;flag sin el flag\nIS_CHECKPOINTED, pero la escritura del folio ya ha sido enviada, no ocurrir\u00e1.\n\nPor lo tanto, para fsync de archivos at\u00f3micos, sbi-\u0026gt;node_write debe adquirirse\na trav\u00e9s de __write_node_folio para asegurar que el flag IS_CHECKPOINTED\nindique correctamente que la escritura del checkpoint ha sido completada."
    }
  ],
  "id": "CVE-2026-23267",
  "lastModified": "2026-05-29T18:41:58.070",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-18T18:16:25.573",
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  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
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          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
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  ]
}


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