Secure Encrypted Virtualization | Breaking Cybersecurity News | The Hacker News

A team of academics from the CISPA Helmholtz Center for Information Security in Germany has disclosed the details of a new hardware vulnerability affecting AMD processors. The security flaw, codenamed StackWarp , can allow bad actors with privileged control over a host server to run malicious code within confidential virtual machines (CVMs), undermining the integrity guarantees provided by AMD Secure Encrypted Virtualization with Secure Nested Paging ( SEV-SNP ). It impacts AMD Zen 1 through Zen 5 processors. "In the context of SEV-SNP, this flaw allows malicious VM [virtual machine] hosts to manipulate the guest VM's stack pointer ," researchers Ruiyi Zhang, Tristan Hornetz, Daniel Weber, Fabian Thomas, and Michael Schwarz said . "This enables hijacking of both control and data flow, allowing an attacker to achieve remote code execution and privilege escalation inside a confidential VM." AMD, which is tracking the vulnerability as CVE-2025-29943 (CVSS v4 ...

A group of academics has disclosed a new "software fault attack" on AMD's Secure Encrypted Virtualization ( SEV ) technology that could be potentially exploited by threat actors to infiltrate encrypted virtual machines (VMs) and even perform privilege escalation. The attack has been codenamed  CacheWarp  (CVE-2023-20592) by researchers from the CISPA Helmholtz Center for Information Security and the Graz University of Technology. It impacts AMD CPUs supporting all variants of SEV. "For this research, we specifically looked at AMD's newest TEE, AMD SEV-SNP, relying on the experience from previous attacks on Intel's TEE," security researcher Ruiyi Zhang told The Hacker News. "We found the 'INVD' instruction [flush a processor's cache contents] could be abused under the threat model of AMD SEV." SEV, an  extension  to the AMD-V architecture and introduced in 2016, is designed to isolate VMs from the hypervisor by encrypting the me...

German security researchers claim to have found a new practical attack against virtual machines (VMs) protected using AMD's Secure Encrypted Virtualization (SEV) technology that could allow attackers to recover plaintext memory data from guest VMs. AMD's Secure Encrypted Virtualization (SEV) technology, which comes with EPYC line of processors, is a hardware feature that encrypts the memory of each VM in a way that only the guest itself can access the data, protecting it from other VMs/containers and even from an untrusted hypervisor. Discovered by researchers from the Fraunhofer Institute for Applied and Integrated Security in Munich, the page-fault side channel attack, dubbed SEVered, takes advantage of lack in the integrity protection of the page-wise encryption of the main memory, allowing a malicious hypervisor to extract the full content of the main memory in plaintext from SEV-encrypted VMs. Here's the outline of the SEVered attack, as briefed in the paper :...