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CVE-2020-29569

Estado: ModificadaAlta (8.8)—

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.

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).

Tecnologías afectadas (6)

Debian — Debian LinuxLinux — Linux KernelNetapp — HCI Compute Node BiosNetapp — Solidfire & HCI Management NodeNetapp — Solidfire & HCI Storage NodeXEN — XEN

CWE

Referencias

JSON original (NVD)

Mostrar
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  "published": "2020-12-15T17:15:14.707",
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      "value": "An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback."
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      "value": "Se detectó un problema en el kernel de Linux versiones hasta 5.10.1, tal como es usado con Xen hasta 4.14.x. El backend del bloque PV del kernel de Linux espera que el controlador de subprocesos del kernel restablezca ring-)xenblkd a NULL cuando se detenga. Sin embargo, es posible que el controlador no tenga tiempo de ejecutarse si la interfaz alterna rápidamente entre los estados de conexión y desconexión. Como consecuencia, el backend del bloque puede reutiliza un puntero una vez liberado. Un invitado con mal comportamiento puede desencadenar un bloqueo de dom0 al conectar y desconectar continuamente una interfaz de bloque. No se puede descartar la escalada de privilegios y las fugas de información. Esto solo afecta a los Sistemas con un blkback de Linux"
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  "lastModified": "2026-06-17T03:11:27.003",
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