CVE-2025-10263: Arm C1-Ultra, C1-Premium, Neoverse V3 & V3AE, Neoverse V2, Neoverse V1, Neoverse-N2, Neoverse-N1, Cortex-X9...

Security readout for executives and security teams

A flaw in many Arm processor designs, including Neoverse server chips and Cortex-A/X mobile cores, can let low-privilege software write to memory owned by a higher-privilege layer such as a hypervisor or operating system kernel. That trust boundary is what keeps guest workloads and untrusted code from tampering with the systems that host them. Exposure is broad wherever affected Arm cores run multi-tenant or untrusted workloads: cloud hosts and hypervisors using Neoverse V1/V2/V3/N1/N2, virtualization stacks on Cortex-A/X client and edge devices, and any Red Hat systems flagged by RHSA-2026:34911, 36018, 36348, and 36349. Single-tenant systems face lower practical risk. High priority for any environment running virtualization or untrusted workloads on affected Arm silicon. Direct infrastructure and platform teams to track vendor patches this cycle, prioritize multi-tenant hosts, and require attestations from cloud and hardware vendors that mitigations have been applied. Single-tenant edge devices can follow the normal patch cadence. Mitigation focus: Apply Red Hat errata RHSA-2026:34911, 36018, 36348, and 36349 to affected hosts as they become available.; Deploy the Xen hypervisor fix from XSA-493 on affected Xen deployments.; Install Arm-supplied CPU firmware or microcode updates referenced in developer.arm.com/documentation/112137..

Prepared

Jul 11, 2026, 06:06 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.