CVE-2026-98718
Description
A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) subsystem supporting AMD SEV (Secure Encrypted Virtualization). During virtual machine migration on the same host, CPU cache maintenance was performed after deactivating the source guest's encryption state instead of before. This timing window allows concurrent host memory reclaim operations to reallocate guest memory pages before caches are flushed. As a result, subsequent delayed cache writebacks can overwrite newly allocated memory with stale guest data, leading to memory corruption and host system instability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | Low | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Changed | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H
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