{"api_version":"1","generated_at":"2026-07-24T18:48:17+00:00","cve":"CVE-2024-26878","urls":{"html":"https://cve.report/CVE-2024-26878","api":"https://cve.report/api/cve/CVE-2024-26878.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2024-26878","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-26878"},"summary":{"title":"quota: Fix potential NULL pointer dereference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nquota: Fix potential NULL pointer dereference\n\nBelow race may cause NULL pointer dereference\n\nP1\t\t\t\t\tP2\ndquot_free_inode\t\t\tquota_off\n\t\t\t\t\t  drop_dquot_ref\n\t\t\t\t\t   remove_dquot_ref\n\t\t\t\t\t   dquots = i_dquot(inode)\n  dquots = i_dquot(inode)\n  srcu_read_lock\n  dquots[cnt]) != NULL (1)\n\t\t\t\t\t     dquots[type] = NULL (2)\n  spin_lock(&dquots[cnt]->dq_dqb_lock) (3)\n   ....\n\nIf dquot_free_inode(or other routines) checks inode's quota pointers (1)\nbefore quota_off sets it to NULL(2) and use it (3) after that, NULL pointer\ndereference will be triggered.\n\nSo let's fix it by using a temporary pointer to avoid this issue.","state":"PUBLISHED","assigner":"Linux","published_at":"2024-04-17 11:15:09","updated_at":"2026-05-12 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Fix potential NULL pointer dereference","CVE":"CVE-2024-26878","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"26878","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nquota: Fix potential NULL pointer dereference\n\nBelow race may cause NULL pointer dereference\n\nP1\t\t\t\t\tP2\ndquot_free_inode\t\t\tquota_off\n\t\t\t\t\t  drop_dquot_ref\n\t\t\t\t\t   remove_dquot_ref\n\t\t\t\t\t   dquots = i_dquot(inode)\n  dquots = i_dquot(inode)\n  srcu_read_lock\n  dquots[cnt]) != NULL (1)\n\t\t\t\t\t     dquots[type] = NULL (2)\n  spin_lock(&dquots[cnt]->dq_dqb_lock) (3)\n   ....\n\nIf dquot_free_inode(or other routines) checks inode's quota pointers (1)\nbefore quota_off sets it to NULL(2) and use it (3) after that, NULL pointer\ndereference will be triggered.\n\nSo let's fix it by using a temporary pointer to avoid this issue.","Type":"Description","Title":"quota: Fix potential NULL pointer dereference"}]}}}