CVE-2026-98715

A flaw was found in the Linux kernel's KVM (Kernel-based Virtual Machine) AMD Secure Virtual Machine (SVM) implementation. This flaw can lead to information disclosure or memory corruption due to dropped Translation Lookaside Buffer (TLB) flushes. When a virtual machine execution (VMRUN) fails, KVM resets the TLB control state without verifying whether the processor completed the flush request. A local guest user could exploit this flaw during address space reuse to retain stale memory mappings, potentially accessing or corrupting unauthorized memory.

This vulnerability is rated as an Important severity impact because a malicious guest could break hypervisor isolation boundaries, leading to unauthorized host or cross-guest data exposure and memory tampering. The flaw exclusively affects Red Hat Enterprise Linux and OpenShift virtualization hosts operating on AMD hardware with AMD Secure Virtual Machine (SVM) enabled. Intel-based deployments remain unaffected due to their reliance on the VMX architecture, and systems that do not run virtualized workloads are not exposed.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.