CVE-2022-42919

Estado: ModificadaAlta (7.8)—

Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non-default configuration. The Python multiprocessing library, when used with the forkserver start method on Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which in many system configurations means any user on the same machine. Pickles can execute arbitrary code. Thus, this allows for local user privilege escalation to the user that any forkserver process is running as.

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Setting multiprocessing.util.abstract_sockets_supported to False is a workaround. The forkserver start method for multiprocessing is not the default start method. This issue is Linux specific because only Linux supports abstract namespace sockets. CPython before 3.9 does not make use of Linux abstract namespace sockets by default. Support for users manually specifying an abstract namespace socket was added as a bugfix in 3.7.8 and 3.8.3, but users would need to make specific uncommon API calls in order to do that in CPython before 3.9.

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: 0.75%
Percentil entre todas las CVEs puntuadas: 53
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).

Tecnologías afectadas (2)

Fedoraproject — Fedora Python — Python

CWE

NVD-CWE-noinfo
CWE-502

Referencias

JSON original (NVD)

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  "id": "CVE-2022-42919",
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      "lang": "en",
      "value": "Python 3.9.x before 3.9.16 and 3.10.x before 3.10.9 on Linux allows local privilege escalation in a non-default configuration. The Python multiprocessing library, when used with the forkserver start method on Linux, allows pickles to be deserialized from any user in the same machine local network namespace, which in many system configurations means any user on the same machine. Pickles can execute arbitrary code. Thus, this allows for local user privilege escalation to the user that any forkserver process is running as. Setting multiprocessing.util.abstract_sockets_supported to False is a workaround. The forkserver start method for multiprocessing is not the default start method. This issue is Linux specific because only Linux supports abstract namespace sockets. CPython before 3.9 does not make use of Linux abstract namespace sockets by default. Support for users manually specifying an abstract namespace socket was added as a bugfix in 3.7.8 and 3.8.3, but users would need to make specific uncommon API calls in order to do that in CPython before 3.9."
    },
    {
      "lang": "es",
      "value": "Python 3.9.x anterior a la versión 3.9.16 y 3.10.x anterior a la versión 3.10.9 en Linux permite la escalada de privilegios locales en una configuración no predeterminada. La librería de multiprocesamiento Python, cuando se usa con el método de inicio forkserver en Linux, permite deserializar pickles de cualquier usuario en el mismo espacio de nombres de red local de la máquina, lo que en muchas configuraciones del sistema significa cualquier usuario en la misma máquina. Pickles puede ejecutar código arbitrario. Por lo tanto, esto permite escalar los privilegios del usuario local al usuario con el que se ejecuta cualquier proceso de forkserver. Como workaround se puede configurar multiprocessing.util.abstract_sockets_supported a False. El método de inicio de forkserver para multiprocesamiento no es el método de inicio predeterminado. Este problema es específico de Linux porque solo Linux admite sockets de espacios de nombres abstractos. CPython anterior a 3.9 no utiliza sockets de espacio de nombres abstractos de Linux de forma predeterminada. Se añadió soporte para usuarios que especifican manualmente un socket de espacio de nombres abstracto como corrección de errores en 3.7.8 y 3.8.3, pero los usuarios tendrían que realizar llamadas API poco comunes específicas para poder hacerlo en CPython antes de 3.9."
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  "lastModified": "2026-06-17T05:05:35.240",
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