New $50 Battering RAM Attack Breaks Intel and AMD Cloud Security Protections

A group of academics from KU Leuven and the University of Birmingham has demonstrated a new vulnerability called Battering RAM to bypass the latest defenses on Intel and AMD cloud processors. "We built a simple, $50 interposer that sits quietly in the memory path, behaving transparently during...

CVE-2024-36331

Improper initialization of CPU cache memory could allow a privileged attacker with hypervisor access to overwrite SEV-SNP guest memory resulting in loss of data integrity...

CVE-2024-36331

Improper initialization of CPU cache memory could allow a privileged attacker with hypervisor access to overwrite SEV-SNP guest memory resulting in loss of data integrity...

x86/sev: Evict cache lines during SNP memory validation

...

Linux Distros Unpatched Vulnerability : CVE-2024-36331

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Improper initialization of CPU cache memory could allow a privileged attacker with hypervisor access to overwrite SEV-SNP guest memory resulting in loss of data...

PT-2025-46738

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.16.0-rc7+ Description The Linux kernel contained a flaw related to memory mapping within KVM when running as a Secure Nested Paging SNP or Trusted Execution Technology TDX guest. Specifically, the legacy PCI...

CVE-2025-38560

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Evict cache lines during SNP memory validation An SNP cache coherency vulnerability requires a cache line eviction mitigation when validating memory after a page state change to private. The specific mitigation is to tou...

CVE-2025-38560 x86/sev: Evict cache lines during SNP memory validation

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Evict cache lines during SNP memory validation An SNP cache coherency vulnerability requires a cache line eviction mitigation when validating memory after a page state change to private. The specific mitigation is to tou...

CVE-2025-38560

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Evict cache lines during SNP memory validation An SNP cache coherency vulnerability requires a cache line eviction mitigation when validating memory after a page state change to private. The specific mitigation is to tou...

CVE-2025-38506

In the Linux kernel, the following vulnerability has been resolved: KVM: Allow CPU to reschedule while setting per-page memory attributes When running an SEV-SNP guest with a sufficiently large amount of memory 1TB+, the host can experience CPU soft lockups when running an operation in...

CVE-2025-38508

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Use TSCFACTOR for Secure TSC frequency calculation When using Secure TSC, the GUESTTSCFREQ MSR reports a frequency based on the nominal P0 frequency, which deviates slightly typically 0.2% from the actual mean TSC...

CVE-2025-38508

In the Linux kernel, the following vulnerability has been resolved: x86/sev: Use TSCFACTOR for Secure TSC frequency calculation When using Secure TSC, the GUESTTSCFREQ MSR reports a frequency based on the nominal P0 frequency, which deviates slightly typically 0.2% from the actual mean TSC...

CVE-2025-38506 KVM: Allow CPU to reschedule while setting per-page memory attributes

In the Linux kernel, the following vulnerability has been resolved: KVM: Allow CPU to reschedule while setting per-page memory attributes When running an SEV-SNP guest with a sufficiently large amount of memory 1TB+, the host can experience CPU soft lockups when running an operation in...

AMD Server Vulnerabilities – August 2025

Summary Potential vulnerabilities in AMD EPYC™ Processor platforms that affect IOMMU, AMD Secure Encrypted Virtualization – Secure Nested Paging SEV-SNP and other platform components, were found during audits performed internally and by third parties. Mitigations have been provided in AMD EPYC™...

SEV Ciphertext Side Channel Attacks

Summary AMD has received reports from two research groups detailing methods by which a malicious hypervisor could potentially execute a side channel attack against a running secure encrypted virtualization – secure nested paging SEV-SNP guest. The first report, titled “Relocate + Vote: Exploiting...

PT-2025-33759

Name of the Vulnerable Software and Affected Versions: Linux kernel affected versions not specified Description: The Linux kernel contains a cache coherency vulnerability within the x86/sev subsystem related to Secure Nested Paging SNP memory validation. The issue requires cache line eviction...

PT-2025-33551

Name of the Vulnerable Software and Affected Versions: Linux kernel affected versions not specified Description: The Linux kernel contains a flaw related to Secure TSC frequency calculation in SEV-SNP VMs. The GUEST TSC FREQ MSR reports a frequency based on the nominal P0 frequency, which deviate...

HPESBHF04774 rev.1 - Certain HPE ProLiant Servers using AMD 3rd Generation and 4th Generation EPYC Processors, AMD-SB-3015, Undermining Integrity Features of SEV-SNP with Memory Aliasing (BadRAM)

Potential Security Impact: Local: Compromise of System Integrity SUPPORTED SOFTWARE VERSIONS: ONLY impacted versions are listed. HPE ProLiant DL145 Gen11 - Prior to v1.40 HPE ProLiant DL325 Gen11 Server - Prior to v2.30 HPE ProLiant DL345 Gen11 Server - Prior to v2.30 HPE ProLiant DL365 Gen11...

PT-2026-7453

Insufficient Granularity of Access Control in SEV firmware could allow a privileged user with a malicious hypervisor to create a SEV-ES guest with an ASID in the range meant for SEV-SNP guests potentially resulting in a partial loss of confidentiality...

AMD Secure Processor和AMD Secure Encrypted Virtualization 安全漏洞

AMD Secure Encrypted Virtualization and AMD Secure Processor ASP are both products of Ultraviolet Semiconductor AMD, Inc.AMD Secure Encrypted Virtualization is a software application. Hardware-accelerated memory encryption to protect data in use.AMD Secure Processor is a standalone ARM Coretex-A5...