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CVE-2022-49349

Estado: ModificadaAlta (7.8)—

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

ext4: fix use-after-free in ext4_rename_dir_prepare

We got issue as follows: EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue ext4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478 ext4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000 ext4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae ================================================================== BUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220 Read of size 4 at addr ffff88810beee6ae by task rep/1895

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The buggy address belongs to the page: page:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee flags: 0x200000000000000() raw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected

Memory state around the buggy address: ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== Disabling lock debugging due to kernel taint ext4_rename_dir_prepare: [2] parent_de->inode=3537895424 ext4_rename_dir_prepare: [3] dir=0xffff888124170140 ext4_rename_dir_prepare: [4] ino=2 ext4_rename_dir_prepare: ent->dir->i_ino=2 parent=-757071872

Reason is first directory entry which 'rec_len' is 34478, then will get illegal parent entry. Now, we do not check directory entry after read directory block in 'ext4_get_first_dir_block'. To solve this issue, check directory entry in 'ext4_get_first_dir_block'.

Detalles técnicos trazas, registros y código del informe original
CPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241
Call Trace:
 dump_stack+0xbe/0xf9
 print_address_description.constprop.0+0x1e/0x220
 kasan_report.cold+0x37/0x7f
 ext4_rename_dir_prepare+0x152/0x220
 ext4_rename+0xf44/0x1ad0
 ext4_rename2+0x11c/0x170
 vfs_rename+0xa84/0x1440
 do_renameat2+0x683/0x8f0
 __x64_sys_renameat+0x53/0x60
 do_syscall_64+0x33/0x40
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f45a6fc41c9
RSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9
RDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005
RBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080
R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0
R13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000

[ Trigger an ext4_error() instead of just warning if the directory is
  missing a '.' or '..' entry.   Also make sure we return an error code
  if the file system is corrupted.  -TYT ]

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

AV:L + UI:R requiere interacción del usuario (abrir archivo malformado). Use-after-free en kernel permite ejecución arbitraria y escalada de privilegios.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Tecnologías afectadas (1)

CWE

Referencias

JSON original (NVD)

Mostrar
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free in ext4_rename_dir_prepare\n\nWe got issue as follows:\nEXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue\next4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478\next4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000\next4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae\n==================================================================\nBUG: KASAN: use-after-free in ext4_rename_dir_prepare+0x152/0x220\nRead of size 4 at addr ffff88810beee6ae by task rep/1895\n\nCPU: 13 PID: 1895 Comm: rep Not tainted 5.10.0+ #241\nCall Trace:\n dump_stack+0xbe/0xf9\n print_address_description.constprop.0+0x1e/0x220\n kasan_report.cold+0x37/0x7f\n ext4_rename_dir_prepare+0x152/0x220\n ext4_rename+0xf44/0x1ad0\n ext4_rename2+0x11c/0x170\n vfs_rename+0xa84/0x1440\n do_renameat2+0x683/0x8f0\n __x64_sys_renameat+0x53/0x60\n do_syscall_64+0x33/0x40\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\nRIP: 0033:0x7f45a6fc41c9\nRSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f45a6fc41c9\nRDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005\nRBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080\nR10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0\nR13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000\n\nThe buggy address belongs to the page:\npage:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee\nflags: 0x200000000000000()\nraw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000\nraw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n>ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n                                  ^\n ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n==================================================================\nDisabling lock debugging due to kernel taint\next4_rename_dir_prepare: [2] parent_de->inode=3537895424\next4_rename_dir_prepare: [3] dir=0xffff888124170140\next4_rename_dir_prepare: [4] ino=2\next4_rename_dir_prepare: ent->dir->i_ino=2 parent=-757071872\n\nReason is first directory entry which 'rec_len' is 34478, then will get illegal\nparent entry. Now, we do not check directory entry after read directory block\nin 'ext4_get_first_dir_block'.\nTo solve this issue, check directory entry in 'ext4_get_first_dir_block'.\n\n[ Trigger an ext4_error() instead of just warning if the directory is\n  missing a '.' or '..' entry.   Also make sure we return an error code\n  if the file system is corrupted.  -TYT ]"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ext4: se corrige el use-after-free en ext4_rename_dir_prepare Tuvimos el siguiente problema: EXT4-fs (loop0): sistema de archivos montado sin diario. Opciones: ,errores=continuar ext4_get_first_dir_block: bh->b_data=0xffff88810bee6000 len=34478 ext4_get_first_dir_block: *parent_de=0xffff88810beee6ae bh->b_data=0xffff88810bee6000 ext4_rename_dir_prepare: [1] parent_de=0xffff88810beee6ae =================================================================== ERROR: KASAN: use-after-free en ext4_rename_dir_prepare+0x152/0x220 Lectura de tamaño 4 en la dirección ffff88810beee6ae por tarea rep/1895 CPU: 13 PID: 1895 Comm: rep No contaminado 5.10.0+ #241 Seguimiento de llamadas: dump_stack+0xbe/0xf9 print_address_description.constprop.0+0x1e/0x220 kasan_report.cold+0x37/0x7f ext4_rename_dir_prepare+0x152/0x220 ext4_rename+0xf44/0x1ad0 ext4_rename2+0x11c/0x170 vfs_rename+0xa84/0x1440 do_renameat2+0x683/0x8f0 __x64_sys_renameat+0x53/0x60 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f45a6fc41c9 RSP: 002b:00007ffc5a470218 EFLAGS: 00000246 ORIG_RAX: 0000000000000108 RAX: ffffffffffffffda RBX: 000000000000000 RCX: 00007f45a6fc41c9 RDX: 0000000000000005 RSI: 0000000020000180 RDI: 0000000000000005 RBP: 00007ffc5a470240 R08: 00007ffc5a470160 R09: 0000000020000080 R10: 00000000200001c0 R11: 0000000000000246 R12: 0000000000400bb0 R13: 00007ffc5a470320 R14: 0000000000000000 R15: 0000000000000000 La dirección con errores pertenece a la página: page:00000000440015ce refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x10beee flags: 0x200000000000000() raw: 0200000000000000 ffffea00043ff4c8 ffffea0004325608 0000000000000000 raw: 000000000000001 000000000000000 00000000ffffffff 000000000000000 página volcada porque: kasan: mal acceso detectado Estado de la memoria alrededor de la dirección con errores: ffff88810beee580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff88810beee600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88810beee680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88810beee700: ff ff ff ff ff ff ff ff ff ff ff ff ffff88810beee780: ff ff ff ff ff ff ff ff ff ff ff ff ff ====================================================================== Desactivar bloqueo depuración debido a la corrupción del kernel ext4_rename_dir_prepare: [2] parent_de->inode=3537895424 ext4_rename_dir_prepare: [3] dir=0xffff888124170140 ext4_rename_dir_prepare: [4] ino=2 ext4_rename_dir_prepare: ent->dir->i_ino=2 parent=-757071872 El motivo es que la primera entrada del directorio cuyo 'rec_len' es 34478, obtendrá una entrada principal ilegal. Ahora, no verificamos la entrada del directorio después de leer el bloque del directorio en 'ext4_get_first_dir_block'. Para resolver este problema, verifique la entrada del directorio en 'ext4_get_first_dir_block'. [ Active un ext4_error() en lugar de solo advertir si al directorio le falta una entrada '.' o '..'. También asegúrese de que devolvamos un código de error si el sistema de archivos está dañado. -¡ ..."
    }
  ],
  "lastModified": "2026-08-04T10:17:45.377",
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          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}