CVE-2025-26403

Vulnerability

Overview

CVE-2025-26403 describes an out-of-bounds write vulnerability in the memory subsystem of certain Intel(R) Xeon(R) 6 processors when Intel(R) SGX or Intel(R) TDX is enabled [1]. The flaw originates in how the hardware handles memory operations under these trusted execution environments, potentially allowing a privileged user to write beyond allocated buffer boundaries.

Exploitation

Requirements

Exploitation requires local access and privileged user permissions [1]. The vulnerability does not appear to be exploitable remotely or from an unprivileged position, but any local account with elevated rights—such as root or administrator—could leverage the out-of-bounds write to corrupt kernel or hypervisor memory structures.

Impact

Assessment

If successfully exploited, an attacker could escalate their privileges further, potentially achieving arbitrary code execution in a higher-privileged context such as the Intel SGX or TDX trusted environment [1]. This could compromise the confidentiality and integrity of sensitive data protected by these hardware enclaves, breaking critical security guarantees.

Mitigation

Status

Intel has released a security advisory (INTEL-SA-01367) that includes firmware updates to address the vulnerability [1]. Users are strongly advised to apply the latest platform firmware updates from their system manufacturer and review Intel's guidance for affected Xeon 6 processor models. No workarounds are documented; patching is the recommended mitigation.