FKIE_CVE-2022-49896

Vulnerability from fkie_nvd - Published: 2025-05-01 15:16 - Updated: 2025-10-01 16:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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. Fix the tracking by allowing cxl_nvdimm objects to track multiple region associations.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4d07ae22e79ebc2d7528bbc69daa53b86981cb3aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f43b6bfdbab78606735ba81185cf0602b81e40b6Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel 6.1
linux linux_kernel 6.1
linux linux_kernel 6.1
To clipboard 

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      "lang": "en",
      "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 -\u003eremove() 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 -\u0026gt;remove() (dispositivo eliminado f\u00edsicamente, nvdimm-bridge deshabilitado o dispositivo nvdimm deshabilitado), entonces cualquier regi\u00f3n asociada tambi\u00e9n debe deshabilitarse. Como se destaca en la prueba cxl-create-region.sh [1], un solo dispositivo puede albergar m\u00faltiples regiones, pero el controlador solo rastreaba una regi\u00f3n a la vez. Esto lleva a una situaci\u00f3n en la que solo la \u00faltima regi\u00f3n habilitada por dispositivo nvdimm se limpia correctamente. Se filtran otras regiones, y esto tambi\u00e9n causa fugas de referencia de cxl_memdev. Arregla el rastreo permitiendo que los objetos cxl_nvdimm rastreen m\u00faltiples asociaciones de regiones."
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  "id": "CVE-2022-49896",
  "lastModified": "2025-10-01T16:15:50.177",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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