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CVE-2025-39842

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: prevent release journal inode after journal shutdown Before calling ocfs2_delete_osb(), ocfs2_journal_shutdown() has already been executed in ocfs2_dismount_volume(), so osb->journal must be NULL. Therefore, the following calltrace will inevitably fail when it reaches jbd2_journal_release_jbd_inode(). ocfs2_dismount_volume()-> ocfs2_delete_osb()-> ocfs2_free_slot_info()-> __ocfs2_free_slot_info()-> evict()-> ocfs2_evict_inode()-> ocfs2_clear_inode()-> jbd2_journal_release_jbd_inode(osb->journal->j_journal, Adding osb->journal checks will prevent null-ptr-deref during the above execution path.

Severity
MEDIUM
CVSS score
5.5 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2025-09-19 16:15:42.930000
Last modified
2026-10-19 21:10:00.160000
View original CVE JSON 
{
  "id": "CVE-2025-39842",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-09-19T16:15:42.930",
  "lastModified": "2026-10-19T21:10:00.160",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: prevent release journal inode after journal shutdown\n\nBefore calling ocfs2_delete_osb(), ocfs2_journal_shutdown() has already\nbeen executed in ocfs2_dismount_volume(), so osb->journal must be NULL. \nTherefore, the following calltrace will inevitably fail when it reaches\njbd2_journal_release_jbd_inode().\n\nocfs2_dismount_volume()->\n  ocfs2_delete_osb()->\n    ocfs2_free_slot_info()->\n      __ocfs2_free_slot_info()->\n        evict()->\n          ocfs2_evict_inode()->\n            ocfs2_clear_inode()->\n\t      jbd2_journal_release_jbd_inode(osb->journal->j_journal,\n\nAdding osb->journal checks will prevent null-ptr-deref during the above\nexecution path."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nocfs2: evitar la liberación del inodo de diario después del cierre del diario\n\nAntes de llamar a ocfs2_delete_osb(), ocfs2_journal_shutdown() ya ha sido ejecutado en ocfs2_dismount_volume(), por lo tanto, osb->journal debe ser NULL. Por lo tanto, el siguiente rastreo de llamadas fallará inevitablemente cuando alcance jbd2_journal_release_jbd_inode().\n\nocfs2_dismount_volume()->\n  ocfs2_delete_osb()->\n    ocfs2_free_slot_info()->\n      __ocfs2_free_slot_info()->\n        evict()->\n          ocfs2_evict_inode()->\n            ocfs2_clear_inode()->\n\t      jbd2_journal_release_jbd_inode(osb->journal->j_journal,\n\nAñadir comprobaciones de osb->journal evitará la desreferenciación de puntero nulo durante la ruta de ejecución anterior."
    }
  ],
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          "product": "SIMATIC CN 4100",
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  "metrics": {
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        "source": "[email protected]",
        "type": "Primary",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
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    }
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}