cve-2020-11743
Vulnerability from cvelistv5
Published
2020-04-14 12:20
Modified
2024-08-04 11:41
Severity ?
EPSS score ?
Summary
An issue was discovered in Xen through 4.13.x, allowing guest OS users to cause a denial of service because of a bad error path in GNTTABOP_map_grant. Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.
References
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Grant table operations are expected to return 0 for success, and a negative number for errors. Some misplaced brackets cause one error path to return 1 instead of a negative value. The grant table code in Linux treats this condition as success, and proceeds with incorrectly initialised state. A buggy or malicious guest can construct its grant table in such a way that, when a backend domain tries to map a grant, it hits the incorrect error path. This will crash a Linux based dom0 or backend domain.\"},{\"lang\":\"es\",\"value\":\"Se detect\u00f3 un problema en Xen versiones hasta 4.13.x, permitiendo a usuarios invitados del Sistema Operativo causar una denegaci\u00f3n de servicio debido a una ruta de error incorrecta en GNTTABOP_map_grant. Es esperado que las operaciones de la tabla de concesiones devuelvan 0 para el \u00e9xito y un n\u00famero negativo para los errores. Algunos corchetes mal colocados causan que una ruta de error devuelva 1 en lugar de un valor negativo. El c\u00f3digo de la tabla de concesi\u00f3n en Linux trata esta condici\u00f3n como exitosa y contin\u00faa incorrectamente con un estado inicializado. Un invitado con errores o malicioso puede construir su tabla de concesi\u00f3n de tal manera que, cuando un dominio del backend intente asignar una concesi\u00f3n, llegue a la ruta de error incorrecta. 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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.