CVE-2022-50497

Estado: AnalizadaAlta (7.1)—

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

binfmt_misc: fix shift-out-of-bounds in check_special_flags

Since the type of Node's flags is unsigned long, we should define these macros with same type too.

Detalles técnicos trazas, registros y código del informe original

UBSAN reported a shift-out-of-bounds warning:

 left shift of 1 by 31 places cannot be represented in type 'int'
 Call Trace:
  <TASK>
  __dump_stack lib/dump_stack.c:88 [inline]
  dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106
  ubsan_epilogue+0xa/0x44 lib/ubsan.c:151
  __ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322
  check_special_flags fs/binfmt_misc.c:241 [inline]
  create_entry fs/binfmt_misc.c:456 [inline]
  bm_register_write+0x9d3/0xa20 fs/binfmt_misc.c:654
  vfs_write+0x11e/0x580 fs/read_write.c:582
  ksys_write+0xcf/0x120 fs/read_write.c:637
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x63/0xcd
 RIP: 0033:0x4194e1

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Puntuación base: 7.1

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.16%
Percentil entre todas las CVEs puntuadas: 5
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %
Impacto secundarioT1499.004 Application or System Exploitationimpact65 %

AV:L/PR:L/UI:N indica escalada local sin interacción. Fallo de UBSAN en binfmt_misc permite DoS o ejecución de código con permisos elevados localmente.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Filter Network Traffic

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-125

Referencias

JSON original (NVD)

Mostrar

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: fix shift-out-of-bounds in check_special_flags\n\nUBSAN reported a shift-out-of-bounds warning:\n\n left shift of 1 by 31 places cannot be represented in type 'int'\n Call Trace:\n  <TASK>\n  __dump_stack lib/dump_stack.c:88 [inline]\n  dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106\n  ubsan_epilogue+0xa/0x44 lib/ubsan.c:151\n  __ubsan_handle_shift_out_of_bounds+0x1e7/0x208 lib/ubsan.c:322\n  check_special_flags fs/binfmt_misc.c:241 [inline]\n  create_entry fs/binfmt_misc.c:456 [inline]\n  bm_register_write+0x9d3/0xa20 fs/binfmt_misc.c:654\n  vfs_write+0x11e/0x580 fs/read_write.c:582\n  ksys_write+0xcf/0x120 fs/read_write.c:637\n  do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n  do_syscall_64+0x34/0x80 arch/x86/entry/common.c:80\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n RIP: 0033:0x4194e1\n\nSince the type of Node's flags is unsigned long, we should define these\nmacros with same type too."
    }
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