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Rapid7 Blog
Rapid7 Blog
added 2026/04/21 2:38 p.m.17 views

Kyber Ransomware Double Trouble: Windows and ESXi Attacks Explained

Overview For executive leadership, the emergence of Kyber ransomware represents a significant and immediate threat due to its specialized, dual-platform deployment capability targeting mission-critical virtualization infrastructure VMware ESXi and core Windows file systems. This cross-platform...

6.1AI score
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RedhatCVE
RedhatCVE
added 2026/04/21 1:22 a.m.8 views

CVE-2026-29649

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg7:4 CBIE/CBCFE/CBZE-related fields is incorrectly masked/updated based on menvcfg7:4, so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to...

9.8CVSS5.7AI score0.00448EPSS
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Tenable Nessus
Tenable Nessus
added 2026/04/21 12:0 a.m.9 views

Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-011273)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-011273 advisory. In the Linux kernel, the following vulnerability has been resolved: riscv: process: fix kernel info leakage threadstruct's s12 may contain random kernel memory...

7.1CVSS5.8AI score0.00194EPSS
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Tenable Nessus
Tenable Nessus
added 2026/04/21 12:0 a.m.8 views

Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-010829)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-010829 advisory. In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Fix crash due to uninitialized currentvmcs KVM enables 'Enlightened VMCS' and...

5.6AI score0.00187EPSS
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Tenable Nessus
Tenable Nessus
added 2026/04/21 12:0 a.m.9 views

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-011166)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-011166 advisory. In the Linux kernel, the following vulnerability has been resolved: RISC-V: Make port I/O string accessors actually work Fix port I/O string accessors such as insb',...

5.9AI score0.00202EPSS
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EUVD
EUVD
added 2026/04/20 9:31 p.m.9 views

EUVD-2026-23944

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg7:4 CBIE/CBCFE/CBZE-related fields is incorrectly masked/updated based on menvcfg7:4, so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to...

5.7AI score0.00448EPSS
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NVD
NVD
added 2026/04/20 8:16 p.m.10 views

CVE-2026-29649

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg7:4 CBIE/CBCFE/CBZE-related fields is incorrectly masked/updated based on menvcfg7:4, so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to...

9.8CVSS0.00448EPSS
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CNNVD
CNNVD
added 2026/04/20 12:0 a.m.17 views

XiangShan 安全漏洞

XiangShan is an open-source high-performance RISC-V processor project developed by XiangShan in China. There is a security vulnerability in XiangShan, which stems from specially crafted read and write operations on the menvcfg structure, potentially causing the WPRI bit to be set unexpectedly,...

7.8CVSS5.8AI score0.00112EPSS
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Positive Technologies
Positive Technologies
added 2026/04/20 12:0 a.m.12 views

PT-2026-33830

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg7:4 CBIE/CBCFE/CBZE-related fields is incorrectly masked/updated based on menvcfg7:4, so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to...

9.8CVSS5.7AI score0.00448EPSS
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ATTACKERKB
ATTACKERKB
added 2026/04/20 12:0 a.m.6 views

CVE-2026-29642

A local attacker who can execute privileged CSR operations or can induce firmware to do so performs carefully crafted reads/writes to menvcfg e.g., csrrs in M-mode. On affected XiangShan versions commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19, these menvcfg accesses can unexpectedly...

5.8AI score0.00112EPSS
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ATTACKERKB
ATTACKERKB
added 2026/04/20 12:0 a.m.10 views

CVE-2026-29645

NEMU OpenXiangShan/NEMU before v2025.12.r2 contains an improper instruction-validation flaw in its RISC-V Vector RVV decoder. The decoder does not correctly validate the funct3 field when decoding vsetvli/vsetivli/vsetvl, allowing certain invalid OP-V instruction encodings to be misinterpreted an...

5.9AI score0.00543EPSS
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Cvelist
Cvelist
added 2026/04/20 12:0 a.m.38 views

CVE-2026-29645

NEMU OpenXiangShan/NEMU before v2025.12.r2 contains an improper instruction-validation flaw in its RISC-V Vector RVV decoder. The decoder does not correctly validate the funct3 field when decoding vsetvli/vsetivli/vsetvl, allowing certain invalid OP-V instruction encodings to be misinterpreted an...

0.00543EPSS
SaveExploits0References4
CVE
CVE
added 2026/04/20 12:0 a.m.13 views

CVE-2026-29645

CVE-2026-29645 (NEMU/OpenXiangShan/NEMU) : The RVV decoder in NEMU before v2025.12.r2 has an improper instruction-validation flaw: it does not properly validate the funct3 field when decoding vsetvli/vsetivli/vsetvl. As a result, certain invalid OP-V instruction encodings can be misinterpreted an...

7.5CVSS5.9AI score0.00543EPSS
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NVD
NVD
added 2026/04/18 12:16 a.m.8 views

CVE-2026-40323

SP1 is a zero‑knowledge virtual machine that proves the correct execution of programs compiled for the RISC-V architecture. In versions 6.0.0 through 6.0.2, a soundness vulnerability in the SP1 V6 recursive shard verifier allows a malicious prover to construct a recursive proof from a shard proof...

8.9CVSS0.00195EPSS
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OSV
OSV
added 2026/04/17 1:2 p.m.12 views

OESA-2026-1960 openvswitch security update

Open vSwitch provides standard network bridging functions and support for the OpenFlow protocol for remote per-flow control of traffic. Security Fixes: "Description\n===========\n\nMultiple versions of Open vSwitch are vulnerable to crafted FTP payloads\ncausing invalid memory accesses, potential...

5.9CVSS5.8AI score0.00405EPSS
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Ubuntu
Ubuntu
added 2026/04/17 9:26 a.m.13 views

USN-8184-1: Linux kernel (Real-time) vulnerabilities

Josh Eads, Kristoffer Janke, Eduardo Vela Nava, Tavis Ormandy, and Matteo Rizzo discovered that some AMD Zen processors did not properly verify the signature of CPU microcode. This flaw is known as EntrySign. A privileged attacker could possibly use this issue to cause load malicious CPU microcod...

9.8CVSS5.9AI score0.00614EPSS
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OSV
OSV
added 2026/04/17 2:44 a.m.7 views

CVE-2026-3605 Vault KVv2 Metadata and Secret Deletion Policy Bypass Denial-of-Service

An authenticated user with access to a kvv2 path through a policy containing a glob may be able to delete secrets they were not authorized to read or write, resulting in denial-of-service. This vulnerability did not allow a malicious user to delete secrets across namespaces, nor read any secret...

8.1CVSS7.1AI score
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Tenable Nessus
Tenable Nessus
added 2026/04/16 12:0 a.m.19 views

Linux Distros Unpatched Vulnerability : CVE-2026-33414

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Podman is a tool for managing OCI containers and pods. Versions 4.8.0 through 5.8.1 contain a command injection vulnerability in the HyperV machine backend in...

8.8CVSS6.1AI score0.00607EPSS
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RedhatCVE
RedhatCVE
added 2026/04/15 7:23 p.m.8 views

CVE-2026-32149

Improper input validation in Windows Hyper-V allows an authorized attacker to execute code locally...

7.3CVSS5.9AI score0.00317EPSS
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RedhatCVE
RedhatCVE
added 2026/04/15 7:23 p.m.9 views

CVE-2026-26156

Heap-based buffer overflow in Windows Hyper-V allows an unauthorized attacker to execute code locally...

7.8CVSS6.2AI score0.00411EPSS
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