nvd-json-data-feeds/CVE-2025/CVE-2025-217xx/CVE-2025-21722.json

{
  "id": "CVE-2025-21722",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2025-02-27T02:15:15.883",
  "lastModified": "2025-03-13T13:15:50.197",
  "vulnStatus": "Undergoing Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: do not force clear folio if buffer is referenced\n\nPatch series \"nilfs2: protect busy buffer heads from being force-cleared\".\n\nThis series fixes the buffer head state inconsistency issues reported by\nsyzbot that occurs when the filesystem is corrupted and falls back to\nread-only, and the associated buffer head use-after-free issue.\n\n\nThis patch (of 2):\n\nSyzbot has reported that after nilfs2 detects filesystem corruption and\nfalls back to read-only, inconsistencies in the buffer state may occur.\n\nOne of the inconsistencies is that when nilfs2 calls mark_buffer_dirty()\nto set a data or metadata buffer as dirty, but it detects that the buffer\nis not in the uptodate state:\n\n WARNING: CPU: 0 PID: 6049 at fs/buffer.c:1177 mark_buffer_dirty+0x2e5/0x520\n  fs/buffer.c:1177\n ...\n Call Trace:\n  <TASK>\n  nilfs_palloc_commit_alloc_entry+0x4b/0x160 fs/nilfs2/alloc.c:598\n  nilfs_ifile_create_inode+0x1dd/0x3a0 fs/nilfs2/ifile.c:73\n  nilfs_new_inode+0x254/0x830 fs/nilfs2/inode.c:344\n  nilfs_mkdir+0x10d/0x340 fs/nilfs2/namei.c:218\n  vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257\n  do_mkdirat+0x264/0x3a0 fs/namei.c:4280\n  __do_sys_mkdirat fs/namei.c:4295 [inline]\n  __se_sys_mkdirat fs/namei.c:4293 [inline]\n  __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293\n  do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe other is when nilfs_btree_propagate(), which propagates the dirty\nstate to the ancestor nodes of a b-tree that point to a dirty buffer,\ndetects that the origin buffer is not dirty, even though it should be:\n\n WARNING: CPU: 0 PID: 5245 at fs/nilfs2/btree.c:2089\n  nilfs_btree_propagate+0xc79/0xdf0 fs/nilfs2/btree.c:2089\n ...\n Call Trace:\n  <TASK>\n  nilfs_bmap_propagate+0x75/0x120 fs/nilfs2/bmap.c:345\n  nilfs_collect_file_data+0x4d/0xd0 fs/nilfs2/segment.c:587\n  nilfs_segctor_apply_buffers+0x184/0x340 fs/nilfs2/segment.c:1006\n  nilfs_segctor_scan_file+0x28c/0xa50 fs/nilfs2/segment.c:1045\n  nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1216 [inline]\n  nilfs_segctor_collect fs/nilfs2/segment.c:1540 [inline]\n  nilfs_segctor_do_construct+0x1c28/0x6b90 fs/nilfs2/segment.c:2115\n  nilfs_segctor_construct+0x181/0x6b0 fs/nilfs2/segment.c:2479\n  nilfs_segctor_thread_construct fs/nilfs2/segment.c:2587 [inline]\n  nilfs_segctor_thread+0x69e/0xe80 fs/nilfs2/segment.c:2701\n  kthread+0x2f0/0x390 kernel/kthread.c:389\n  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n  </TASK>\n\nBoth of these issues are caused by the callbacks that handle the\npage/folio write requests, forcibly clear various states, including the\nworking state of the buffers they hold, at unexpected times when they\ndetect read-only fallback.\n\nFix these issues by checking if the buffer is referenced before clearing\nthe page/folio state, and skipping the clear if it is."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nilfs2: no fuerza la depuraci\u00f3n del folio si se hace referencia al b\u00fafer Serie de parches \"nilfs2: protege los cabezales de b\u00fafer ocupados de ser borrados a la fuerza\". Esta serie corrige los problemas de inconsistencia del estado del cabezal de b\u00fafer informados por syzbot que ocurren cuando el sistema de archivos est\u00e1 da\u00f1ado y vuelve a solo lectura, y el problema asociado de uso del cabezal de b\u00fafer despu\u00e9s de la liberaci\u00f3n. Este parche (de 2): Syzbot ha informado que despu\u00e9s de que nilfs2 detecta la corrupci\u00f3n del sistema de archivos y vuelve a solo lectura, pueden ocurrir inconsistencias en el estado del b\u00fafer. Una de las inconsistencias es que cuando nilfs2 llama a mark_buffer_dirty() para establecer un b\u00fafer de datos o metadatos como sucio, pero detecta que el b\u00fafer no est\u00e1 en el estado actualizado: ADVERTENCIA: CPU: 0 PID: 6049 at fs/buffer.c:1177 mark_buffer_dirty+0x2e5/0x520 fs/buffer.c:1177 ... Call Trace:  nilfs_palloc_commit_alloc_entry+0x4b/0x160 fs/nilfs2/alloc.c:598 nilfs_ifile_create_inode+0x1dd/0x3a0 fs/nilfs2/ifile.c:73 nilfs_new_inode+0x254/0x830 fs/nilfs2/inode.c:344 nilfs_mkdir+0x10d/0x340 fs/nilfs2/namei.c:218 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The other is when nilfs_btree_propagate(), which propagates the dirty state to the ancestor nodes of a b-tree that point to a dirty buffer, detects that the origin buffer is not dirty, even though it should be: WARNING: CPU: 0 PID: 5245 at fs/nilfs2/btree.c:2089 nilfs_btree_propagate+0xc79/0xdf0 fs/nilfs2/btree.c:2089 ... Call Trace:  nilfs_bmap_propagate+0x75/0x120 fs/nilfs2/bmap.c:345 nilfs_collect_file_data+0x4d/0xd0 fs/nilfs2/segment.c:587 nilfs_segctor_apply_buffers+0x184/0x340 fs/nilfs2/segment.c:1006 nilfs_segctor_scan_file+0x28c/0xa50 fs/nilfs2/segment.c:1045 nilfs_segctor_collect_blocks fs/nilfs2/segment.c:1216 [inline] nilfs_segctor_collect fs/nilfs2/segment.c:1540 [inline] nilfs_segctor_do_construct+0x1c28/0x6b90 fs/nilfs2/segment.c:2115 nilfs_segctor_construct+0x181/0x6b0 fs/nilfs2/segment.c:2479 nilfs_segctor_thread_construct fs/nilfs2/segment.c:2587 [inline] nilfs_segctor_thread+0x69e/0xe80 fs/nilfs2/segment.c:2701 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244   Ambos problemas son causados por las devoluciones de llamadas que manejan las solicitudes de escritura de p\u00e1gina/folio, borran a la fuerza varios estados, incluido el estado de trabajo de los b\u00faferes que contienen, en momentos inesperados cuando detectan una reserva de solo lectura. Solucione estos problemas verificando si se hace referencia al b\u00fafer antes de borrar el estado de la p\u00e1gina/folio y omitiendo la limpieza si es as\u00ed."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "weaknesses": [
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1098bb8d52419d262a3358d099a1598a920b730f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/19296737024cd220a1d6590bf4c092bca8c99497",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4d042811c72f71be7c14726db2c72b67025a7cb5",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/557ccf5e49f1fb848a29698585bcab2e50a597ef",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7d0544bacc11d6aa26ecd7debf9353193c7a3328",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ca76bb226bf47ff04c782cacbd299f12ddee1ec1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f51ff43c4c5a6c8e72d0aca89e4d5e688938412f",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}