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CVE-2024-50001

Estado: ModificadaMedia (5.5)—

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

net/mlx5: Fix error path in multi-packet WQE transmit

Remove the erroneous unmap in case no DMA mapping was established

The multi-packet WQE transmit code attempts to obtain a DMA mapping for the skb. This could fail, e.g. under memory pressure, when the IOMMU driver just can't allocate more memory for page tables. While the code tries to handle this in the path below the err_unmap label it erroneously unmaps one entry from the sq's FIFO list of active mappings.

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Since the current map attempt failed this unmap is removing some random DMA mapping that might still be required. If the PCI function now presents that IOVA, the IOMMU may assumes a rogue DMA access and e.g. on s390 puts the PCI function in error state.

The erroneous behavior was seen in a stress-test environment that created memory pressure.

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 (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5: Fix error path in multi-packet WQE transmit\n\nRemove the erroneous unmap in case no DMA mapping was established\n\nThe multi-packet WQE transmit code attempts to obtain a DMA mapping for\nthe skb. This could fail, e.g. under memory pressure, when the IOMMU\ndriver just can't allocate more memory for page tables. While the code\ntries to handle this in the path below the err_unmap label it erroneously\nunmaps one entry from the sq's FIFO list of active mappings. Since the\ncurrent map attempt failed this unmap is removing some random DMA mapping\nthat might still be required. If the PCI function now presents that IOVA,\nthe IOMMU may assumes a rogue DMA access and e.g. on s390 puts the PCI\nfunction in error state.\n\nThe erroneous behavior was seen in a stress-test environment that created\nmemory pressure."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/mlx5: Corregir ruta de error en transmisión WQE de paquetes múltiples Eliminar la desasignación errónea en caso de que no se haya establecido una asignación DMA El código de transmisión WQE de paquetes múltiples intenta obtener una asignación DMA para el skb. Esto podría fallar, por ejemplo, bajo presión de memoria, cuando el controlador IOMMU simplemente no puede asignar más memoria para las tablas de páginas. Si bien el código intenta manejar esto en la ruta debajo de la etiqueta err_unmap, desasigna erróneamente una entrada de la lista FIFO de asignaciones activas del sq. Dado que el intento de asignación actual falló, esta desasignación está eliminando alguna asignación DMA aleatoria que aún podría ser necesaria. Si la función PCI ahora presenta ese IOVA, el IOMMU puede asumir un acceso DMA no autorizado y, por ejemplo, en s390 pone la función PCI en estado de error. El comportamiento erróneo se observó en un entorno de prueba de estrés que creó presión de memoria."
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