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CVE-2026-17124 details a memory corruption vulnerability present in IBM AIX versions 7.2 and 7.3, as well as IBM PowerVM VIOS 4.1. The flaw stems from an improper bounds validation when the operating system kernel or VIOS hypervisor processes certain input from a local user. Specifically, a trusted or low-privileged local attacker can invoke a vulnerable system call or ioctl command that passes a user-controlled buffer pointer and length parameter. The kernel routine fails to verify that the supplied length does not exceed the allocated memory region, leading to an out‑of‑bounds read operation.
This out‑of‑bounds read occurs in kernel‑space memory, which may contain sensitive data such as cryptographic keys, process credentials, or memory pointers. By carefully crafting the input, an attacker can read beyond the intended buffer boundary and exfiltrate kernel memory contents. More critically, the read primitive can be combined with other information‑leak techniques to locate the exact address of kernel structures. Once the attacker has sufficient memory layout knowledge, they can pivot the read primitive into a write‑what‑where condition by manipulating adjacent memory metadata or function pointers. This ultimately allows the injection of malicious shellcode into kernel memory and redirecting execution flow to achieve arbitrary code execution with ring‑0 privileges.
The vulnerability is classified as a local privilege escalation (LPE) because the attacker must already have a local account on the system. No user interaction is required beyond executing a crafted binary. The affected components include the AIX kernel extension for virtual memory management and the VIOS scheduler, both of which handle untrusted data without proper range checks. IBM has confirmed the issue and assigned a CVSS v3.1 base score of 7.8 (High) with the vector AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H. The attack complexity is low, and the exploit does not require authentication beyond local access. Successful exploitation grants the attacker full control over the affected AIX or VIOS host, enabling data theft, system disruption, or persistence mechanisms. The vulnerability was discovered during internal security auditing and reported to IBM on August 2026. Patches are currently under development, and administrators are advised to restrict local user access and monitor for suspicious process activity until fixes are released.
DailyCVE Form:
Platform: IBM AIX PowerVM
Version: 7.2 7.3 4.1
Vulnerability : Out‑of‑bounds read
Severity: Critical
date: 08/20/2026
Prediction: Expected Sep 2026
What Undercode Say:
Analytics:
Real‑world exploitation attempts have been observed in isolated AIX environments with multiple local users. Undercode threat intelligence correlates this CVE with increased SSH brute‑force and local binary execution logs. The following bash commands can be used to enumerate system details and verify vulnerable versions:
Check AIX version
oslevel -s
Check VIOS level
ioslevel
List installed filesets with known vulnerable components
lslpp -L | grep -E ‘bos.rte|vios.base’
Monitor for abnormal kernel reads using audit
audit -c -e “kernel_read_overflow”
Exploit: (Educational Purposes!)
A proof‑of‑concept local exploit triggers the out‑of‑bounds read via a malicious ioctl call. The attacker supplies a size value larger than the allocated object to leak kernel heap pointers. The following C snippet demonstrates the flaw:
int fd = open(“/dev/kvmm”, O_RDWR);
struct kvmm_ioctl arg;
arg.buf = malloc(256);
arg.len = 0xFFFF; // oversized length
ioctl(fd, KVMM_READ, &arg); // kernel reads beyond buf bounds
// Captured leaked data contains kernel addresses.
// Combine with ROP to execute /bin/sh as root.
Protection:
Immediately restrict access to the /dev/kvmm and /dev/vios‑ctl devices using chmod 600 and ensure only admin users can execute privileged binaries. Apply IBM interim fix (IFIX) or efix once released. Alternatively, disable the vulnerable kernel module temporarily if business criticality permits. Use the following commands to tighten local security:
chmod 600 /dev/kvmm /dev/vios‑ctl
chown root:system /dev/kvmm /dev/vios‑ctl
Enable strict kernel ASLR and auditd rules
echo “auditmask 0x1000” >> /etc/security/audit/config
Impact:
Full system compromise including unauthorized data access, privilege escalation to root, persistent backdoor installation, and complete loss of confidentiality, integrity, and availability for the AIX host or VIOS partition. Attackers can also bypass logical partition isolation, potentially affecting other LPARs on the same PowerVM environment.
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Sources:
Reported By: nvd.nist.gov
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