CVE-2026-19574

The ARM64 MMU back-end allocated address space identifiers ASIDs for memory domains with a bare round-robin counter in archmemdomaininit arch/arm64/core/mmu.c. VMASIDBITS is 8, so only 255 ASIDs exist; once the counter wrapped, archmemdomaininit could hand an ASID to a new domain while a still-li...

CVE-2026-19574 ARM64 MMU can assign an in-use ASID to a new memory domain, breaking user-mode memory isolation

The ARM64 MMU back-end allocated address space identifiers ASIDs for memory domains with a bare round-robin counter in archmemdomaininit arch/arm64/core/mmu.c. VMASIDBITS is 8, so only 255 ASIDs exist; once the counter wrapped, archmemdomaininit could hand an ASID to a new domain while a still-li...

CVE-2026-19574

The ARM64 MMU back-end in Zephyr (specifically in arch_mem_domain_init()) contains a vulnerability where it assigns Address Space Identifiers (ASIDs) using a round-robin counter. Because only 255 ASIDs exist, wrapping the counter allows a new memory domain to share an ASID with a still-live domai...

CVE-2026-19574 ARM64 MMU can assign an in-use ASID to a new memory domain, breaking user-mode memory isolation

The ARM64 MMU back-end allocated address space identifiers ASIDs for memory domains with a bare round-robin counter in archmemdomaininit arch/arm64/core/mmu.c. VMASIDBITS is 8, so only 255 ASIDs exist; once the counter wrapped, archmemdomaininit could hand an ASID to a new domain while a still-li...

CVE-2026-19574: Improper Access Control

The ARM64 MMU back-end allocated address space identifiers ASIDs for memory domains with a bare round-robin counter in archmemdomaininit arch/arm64/core/mmu.c. VMASIDBITS is 8, so only 255 ASIDs exist; once the counter wrapped, archmemdomaininit could hand an ASID to a new domain while a still-li...