CVE-2026-18821— Power System Out-of-bounds Write
Quick assessment
Affected
IBM PowerVM Hypervisor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
IBM powervm hypervisor是美国IBM公司的一款企业级虚拟化管理程序。 IBM PowerVM Hypervisor FW1120.00版本、FW1110.00版本至FW1110.30版本、FW1060.00版本至FW1060.80版本和FW950.00版本至FW950.H2版本存在缓冲区错误漏洞，该漏洞源于分区固件在网络启动期间存在安全问题，可能导致同一网络的未经身份验证的攻击者发送畸形分组，在分区固件中执行任意代码，进而影响机密性、完整性和可用性。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| IBM | PowerVM Hypervisor | FW1120.00 |
affected |
FW1110.00≤ FW1110.30 |
affected | ||
FW1060.00≤ FW1060.80 |
affected | ||
FW950.00≤ FW950.H2 |
affected |
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I. Basic Information for CVE-2026-18821
Vulnerability Information
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Vulnerability Title
Power System Out-of-bounds Write
Source: CVE Program / CVE List V5
Vulnerability Description
IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 Power Systems Firmware is affected by a vulnerability in partition firmware during network boot. An unauthenticated attacker on the same network as a partition undergoing network boot can send a malformed packet, allowing arbitrary code to be executed in the partition firmware and compromising everything subsequently loaded by that partition. Other partitions and the managed system are not affected. Only partitions actively performing a network boot are affected, resulting in a confidentiality, integrity, and availability impact.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
IBM PowerVM Hypervisor 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
IBM powervm hypervisor是美国IBM公司的一款企业级虚拟化管理程序。 IBM PowerVM Hypervisor FW1120.00版本、FW1110.00版本至FW1110.30版本、FW1060.00版本至FW1060.80版本和FW950.00版本至FW950.H2版本存在缓冲区错误漏洞，该漏洞源于分区固件在网络启动期间存在安全问题，可能导致同一网络的未经身份验证的攻击者发送畸形分组，在分区固件中执行任意代码，进而影响机密性、完整性和可用性。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| IBM | PowerVM Hypervisor | FW1120.00 |
cpe:2.3:o:ibm:power_systems_firmware:fw1120.00:*:*:*:*:*:*:*
|
|
II. Public POCs for CVE-2026-18821
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-18821 (1)
Same Patch Batch · IBM · 2026-08-19 · 107 CVEs total
| CVE-2026-15068 | 9.9 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16816 | 9.9 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16894 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16882 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16919 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16917 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16862 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16864 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16913 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16834 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16885 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16845 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16872 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16656 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16840 | 9.8 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16903 | 9.6 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16835 | 9.6 CRITICAL | Power System Improper Certificate Validation |
| CVE-2026-16687 | 9.6 CRITICAL | Power System Buffer Overflow |
| CVE-2026-16839 | 9.4 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
| CVE-2026-16822 | 9.3 CRITICAL | Vulnerabilities in IBM AIX and PowerVM VIOS |
Showing top 20 of 107 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same vendor: IBM
V. Comments for CVE-2026-18821
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