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IBM AIX 7.2、7.3 以及 IBM PowerVM VIOS 4.1 中存在一个严重的操作系统命令注入漏洞，被标识为 CVE-2026-16882。该漏洞源于软件对用户可控输入中特殊元素（如 |、&、; 等 shell 元字符）的不当中和（Improper Neutralization of Special Elements used in an OS Command），属于 CWE-78 类型的安全缺陷。
在默认配置下，受影响的系统未对特定输入进行充分过滤和转义。攻击者可以通过向受影响的服务或应用发送特制的恶意数据，在未经认证的情况下，利用该缺陷将恶意命令注入到操作系统层的命令执行上下文中。由于该漏洞无需任何身份验证即可远程触发，且攻击复杂度低，成功利用后，攻击者将获得与目标进程相同的权限——在 AIX 和 VIOS 环境中通常为 root 权限。这可能导致攻击者完全控制系统，进而执行任意命令、安装后门、窃取敏感数据，并在企业内网中进行横向移动。CVSS 3.1 评分为 9.8（严重），攻击向量为网络（AV:N），攻击复杂度低（AC:L），无需权限（PR:N）且无需用户交互（UI:N），对机密性、完整性和可用性均造成高影响（C:H/I:H/A:H）。
目前尚未发现该漏洞被列入 CISA 已知被利用漏洞目录（KEV），但其高严重性意味着在真实环境中被攻击者利用的可能性极高。
DailyCVE Form:
Platform: IBM AIX / PowerVM VIOS
Version: 7.2, 7.3 / 4.1
Vulnerability: OS Command Injection
Severity: Critical (9.8)
date: August 19, 2026
Prediction: August 14, 2026 (APAR)
What Undercode Say:
The vulnerability stems from improper input sanitization in OS command construction. Attackers can inject commands via unsanitized parameters.
Check AIX version oslevel -s Check VIOS version ioslevel Verify patch level (AIX) instfix -ik IJ59563 | grep IJ59563 instfix -ik IJ59564 | grep IJ59564 instfix -ik IJ59565 | grep IJ59565 Verify patch level (VIOS) emgr -l | grep IJ59563 emgr -l | grep IJ59564 emgr -l | grep IJ59565
Exploit: (Educational Purposes!)
A remote attacker could send a crafted request containing shell metacharacters to inject arbitrary OS commands:
Example injection payload (illustrative) vulnerable_param="valid_input; id; whoami; uname -a"
Because the application fails to neutralize ;, |, &, or ` characters, the injected commands execute with the privileges of the target process.
Protection:
- Apply Official Fixes: Download and install the appropriate service packs (SPs) or fix packs (FPs) from IBM Fix Central:
– AIX 7.3 TL04 SP2, TL03 SP3, TL02 SP5
– AIX 7.2 TL05 SP13
– VIOS 4.1.2 4.1.2.20, 4.1.1 4.1.1.30, 4.1.0 4.1.0.50
2. Restart Required: Reboot the LPAR after applying patches (Live Update available on AIX).
3. Restrict Network Access: Limit access to affected services using firewalls or TCP wrappers.
4. Disable Unnecessary Services: Disable vulnerable components if not required.
Impact:
- System Compromise: Full root-level control of AIX or VIOS host.
- Data Breach: Exfiltration of sensitive data.
- Lateral Movement: Pivot point for attacks within the enterprise network.
- Service Disruption: Potential disruption of critical infrastructure.
- Internet-Facing Risk: Immediate risk if systems are exposed to the internet.
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Sources:
Reported By: nvd.nist.gov
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