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CVE-2022-49896

Estado: ModificadaMedia (5.5)—

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

cxl/pmem: Fix cxl_pmem_region and cxl_memdev leak

When a cxl_nvdimm object goes through a ->remove() event (device physically removed, nvdimm-bridge disabled, or nvdimm device disabled), then any associated regions must also be disabled. As highlighted by the cxl-create-region.sh test [1], a single device may host multiple regions, but the driver was only tracking one region at a time. This leads to a situation where only the last enabled region per nvdimm device is cleaned up properly. Other regions are leaked, and this also causes cxl_memdev reference leaks.

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Fix the tracking by allowing cxl_nvdimm objects to track multiple region associations.

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\ncxl/pmem: Fix cxl_pmem_region and cxl_memdev leak\n\nWhen a cxl_nvdimm object goes through a ->remove() event (device\nphysically removed, nvdimm-bridge disabled, or nvdimm device disabled),\nthen any associated regions must also be disabled. As highlighted by the\ncxl-create-region.sh test [1], a single device may host multiple\nregions, but the driver was only tracking one region at a time. This\nleads to a situation where only the last enabled region per nvdimm\ndevice is cleaned up properly. Other regions are leaked, and this also\ncauses cxl_memdev reference leaks.\n\nFix the tracking by allowing cxl_nvdimm objects to track multiple region\nassociations."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: cxl/pmem: Arregla la fuga de cxl_pmem_region y cxl_memdev Cuando un objeto cxl_nvdimm pasa por un evento ->remove() (dispositivo eliminado físicamente, nvdimm-bridge deshabilitado o dispositivo nvdimm deshabilitado), entonces cualquier región asociada también debe deshabilitarse. Como se destaca en la prueba cxl-create-region.sh [1], un solo dispositivo puede albergar múltiples regiones, pero el controlador solo rastreaba una región a la vez. Esto lleva a una situación en la que solo la última región habilitada por dispositivo nvdimm se limpia correctamente. Se filtran otras regiones, y esto también causa fugas de referencia de cxl_memdev. Arregla el rastreo permitiendo que los objetos cxl_nvdimm rastreen múltiples asociaciones de regiones."
    }
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  "lastModified": "2026-06-17T05:19:27.080",
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