Vulnerability · Published Sep 24, 2026 · Assigned by ibm

CVE-2026-17503This Power System update is being released to address

Medium 5.1

In plain English

A medium-severity improper input validation in PowerVM Hypervisor from IBM. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)5.1Medium

Exploit odds (30 days)0.1%top 98.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, FW1060.00 through FW1060.81, and FW950.00 through FW950.H3 is affected by a vulnerability in the partition firmware runtime boot configuration. An attacker with root access to a partition can maliciously alter partition nvram, causing the partition to fail to boot. This condition persists until operator intervention — deleting and recreating the partition configuration — to restore normal operation. Successful exploitation results in an integrity and availability impact.

Affected products (as reported)

Vendor	Product	Versions
IBM	PowerVM Hypervisor	FW1120.00 – through FW1120.01FW1110.00 – through FW1110.31FW1060.00 – through FW1060.81FW950.00 – through FW950.H3

Weakness: CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H

References

https://www.ibm.com/support/pages/node/7289133 vendor-advisory, patch