CVE-2022-49804

Estado: ModificadaAlta (7.8)—

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

s390: avoid using global register for current_stack_pointer

Commit 30de14b1884b ("s390: current_stack_pointer shouldn't be a function") made current_stack_pointer a global register variable like on many other architectures. Unfortunately on s390 it uncovers old gcc bug which is fixed only since gcc-9.1 [gcc commit 3ad7fed1cc87 ("S/390: Fix PR89775. Stackpointer save/restore instructions removed")] and backported to gcc-8.4 and later. Due to this bug gcc versions prior to 8.4 generate broken code which leads to stack corruptions.

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Current minimal gcc version required to build the kernel is declared as 5.1. It is not possible to fix all old gcc versions, so work around this problem by avoiding using global register variable for current_stack_pointer.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.19%
Percentil entre todas las CVEs puntuadas: 8
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 escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

Vulnerabilidad local (AV:L/PR:L) sin interacción: corrupción de stack en kernel s390 permite escalada de privilegios y ejecución de código arbitrario con permisos elevados.

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 Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-787

Referencias

JSON original (NVD)

Mostrar

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390: avoid using global register for current_stack_pointer\n\nCommit 30de14b1884b (\"s390: current_stack_pointer shouldn't be a\nfunction\") made current_stack_pointer a global register variable like\non many other architectures. Unfortunately on s390 it uncovers old\ngcc bug which is fixed only since gcc-9.1 [gcc commit 3ad7fed1cc87\n(\"S/390: Fix PR89775. Stackpointer save/restore instructions removed\")]\nand backported to gcc-8.4 and later. Due to this bug gcc versions prior\nto 8.4 generate broken code which leads to stack corruptions.\n\nCurrent minimal gcc version required to build the kernel is declared\nas 5.1. It is not possible to fix all old gcc versions, so work\naround this problem by avoiding using global register variable for\ncurrent_stack_pointer."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: s390: evitar el uso de un registro global para current_stack_pointer. El commit 30de14b1884b (\"s390: current_stack_pointer no debería ser una función\") convirtió current_stack_pointer en una variable de registro global, como en muchas otras arquitecturas. Desafortunadamente, en s390, se descubre un antiguo error de gcc corregido solo desde gcc-9.1 [commit 3ad7fed1cc87 de gcc (\"S/390: Corrección de PR89775. Se eliminaron las instrucciones de guardado/restauración de Stackpointer\")] y se ha retroportado a gcc-8.4 y posteriores. Debido a este error, las versiones de gcc anteriores a la 8.4 generan código defectuoso que provoca corrupciones en la pila. La versión mínima actual de gcc requerida para compilar el kernel es la 5.1. No es posible corregir todas las versiones antiguas de gcc, por lo que se puede solucionar este problema evitando el uso de la variable de registro global para current_stack_pointer."
    }
  ],
  "lastModified": "2026-08-04T10:17:56.670",
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