
CVE-2022-23824 – Debian Security Advisory 5378-1
https://notcve.org/view.php?id=CVE-2022-23824
09 Nov 2022 — IBPB may not prevent return branch predictions from being specified by pre-IBPB branch targets leading to a potential information disclosure. IBPB no puede evitar que las predicciones de sucursales de retorno sean especificadas por objetivos de sucursales anteriores a IBPB, lo que lleva a una posible divulgación de información. Multiple vulnerabilities have been found in Xen, the worst of which can lead to arbitrary code execution. Versions greater than or equal to 4.16.6_pre1 are affected. • http://www.openwall.com/lists/oss-security/2022/11/10/2 •

CVE-2021-46778
https://notcve.org/view.php?id=CVE-2021-46778
09 Aug 2022 — Execution unit scheduler contention may lead to a side channel vulnerability found on AMD CPU microarchitectures codenamed “Zen 1”, “Zen 2” and “Zen 3” that use simultaneous multithreading (SMT). By measuring the contention level on scheduler queues an attacker may potentially leak sensitive information. La contención del planificador de la unidad de ejecución puede conllevar a una vulnerabilidad de canal lateral encontrada en las microarquitecturas de CPU de AMD con nombre en código "Zen 1", "Zen 2" y "Zen... • https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1039 • CWE-203: Observable Discrepancy •

CVE-2022-23825 – hw: cpu: AMD: Branch Type Confusion (non-retbleed)
https://notcve.org/view.php?id=CVE-2022-23825
14 Jul 2022 — Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type potentially leading to information disclosure. Los alias en el predictor de bifurcación pueden causar que algunos procesadores AMD predigan el tipo de bifurcación incorrecto, conllevando a una divulgación de información A flaw was found in hw. Aliases in the branch predictor may cause some AMD processors to predict the wrong branch type, potentially leading to information disclosure. Red Hat Advanced Cluster Manag... • http://www.openwall.com/lists/oss-security/2022/11/08/1 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-668: Exposure of Resource to Wrong Sphere •

CVE-2022-29900 – hw: cpu: AMD: RetBleed Arbitrary Speculative Code Execution with Return Instructions
https://notcve.org/view.php?id=CVE-2022-29900
12 Jul 2022 — Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchitecture-dependent conditions. Las predicciones de bifurcación mal entrenadas para las instrucciones de retorno pueden permitir la ejecución arbitraria de código especulativo bajo ciertas condiciones dependientes de la microarquitectura A flaw was found in hw. Mis-trained branch predictions for return instructions may allow arbitrary speculative code execution under certain microarchi... • https://lists.debian.org/debian-lts-announce/2022/09/msg00011.html • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor CWE-212: Improper Removal of Sensitive Information Before Storage or Transfer •

CVE-2022-23823
https://notcve.org/view.php?id=CVE-2022-23823
15 Jun 2022 — A potential vulnerability in some AMD processors using frequency scaling may allow an authenticated attacker to execute a timing attack to potentially enable information disclosure. Una vulnerabilidad potencial en algunos procesadores AMD que usan el escalado de frecuencia puede permitir a un atacante autenticado ejecutar un ataque de tiempo para permitir potencialmente la divulgación de información • https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1038 • CWE-203: Observable Discrepancy •

CVE-2021-46744
https://notcve.org/view.php?id=CVE-2021-46744
11 May 2022 — An attacker with access to a malicious hypervisor may be able to infer data values used in a SEV guest on AMD CPUs by monitoring ciphertext values over time. Un atacante con acceso a un hipervisor malicioso puede ser capaz de inferir los valores de los datos usados en un huésped SEV en CPUs AMD mediante la monitorización de los valores del texto cifrado a lo largo del tiempo • http://www.openwall.com/lists/oss-security/2022/08/08/6 • CWE-203: Observable Discrepancy •

CVE-2021-26342
https://notcve.org/view.php?id=CVE-2021-26342
11 May 2022 — In SEV guest VMs, the CPU may fail to flush the Translation Lookaside Buffer (TLB) following a particular sequence of operations that includes creation of a new virtual machine control block (VMCB). The failure to flush the TLB may cause the microcode to use stale TLB translations which may allow for disclosure of SEV guest memory contents. Users of SEV-ES/SEV-SNP guest VMs are not impacted by this vulnerability. En las máquinas virtuales invitadas de SEV, la CPU puede fallar al vaciar la memoria intermedia... • https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028 •

CVE-2021-26408
https://notcve.org/view.php?id=CVE-2021-26408
10 May 2022 — Insufficient validation of elliptic curve points in SEV-legacy firmware may compromise SEV-legacy guest migration potentially resulting in loss of guest's integrity or confidentiality. Una comprobación insuficiente de los puntos de la curva elíptica en el firmware de SEV-legacy puede comprometer la migración de los huéspedes de SEV-legacy, resultando potencialmente en una pérdida de la integridad o la confidencialidad de los huéspedes • https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021 •

CVE-2020-12966
https://notcve.org/view.php?id=CVE-2020-12966
04 Feb 2022 — AMD EPYC™ Processors contain an information disclosure vulnerability in the Secure Encrypted Virtualization with Encrypted State (SEV-ES) and Secure Encrypted Virtualization with Secure Nested Paging (SEV-SNP). A local authenticated attacker could potentially exploit this vulnerability leading to leaking guest data by the malicious hypervisor. Los procesadores AMD EPYC™ contienen una vulnerabilidad de divulgación de información en la virtualización cifrada segura con estado cifrado (SEV-ES) y la virtualizac... • http://www.openwall.com/lists/oss-security/2022/08/08/6 • CWE-200: Exposure of Sensitive Information to an Unauthorized Actor •

CVE-2021-26340
https://notcve.org/view.php?id=CVE-2021-26340
10 Dec 2021 — A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside Buffer (TLB) resulting in unexpected behavior inside the virtual machine (VM). Un Hypervisor malicioso en conjunción con un proceso de atacante no privilegiado dentro de una máquina virtual invitada SEV/SEV-ES puede producir un fallo en el vaciado de la Memoria Intermedia de Traducción (TLB), resultando en un comportamiento no esperado dentro de la máquina vir... • https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1023 •