Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

CVE-2026-6386

Gravedad CVSS v3.1:
MEDIA
Tipo:
CWE-269 Gestión de privilegios incorrecta
Fecha de publicación:
22/04/2026
Última modificación:
22/04/2026

Descripción

*** Pendiente de traducción *** In order to apply a particular protection key to an address range, the kernel must update the corresponding page table entries. The subroutine which handled this failed to take into account the presence of 1GB largepage mappings created using the shm_create_largepage(3) interface. In particular, it would always treat a page directory page entry as pointing to another page table page.<br /> <br /> The bug can be abused by an unprivileged user to cause pmap_pkru_update_range() to treat userspace memory as a page table page, and thus overwrite memory to which the application would otherwise not have access.

Referencias a soluciones, herramientas e información