Medium Input validation

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

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.

Published Sep 24, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: ibm

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.1% (30-day exploitation probability)+0
Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.11%

ahead of 1% of scored CVEs · Oct 15, 2026

Affects

Ibm

Power System E1050 (9043-mrx) Firmware and 26 more

CVSS base

5.1

Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — www.ibm.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Ibm Power System E1050 (9043-mrx) Firmware, Ibm Power System E1080 (9080-hex) Firmware, Ibm Power System E1150 (9043-mru) Firmware…).
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (input validation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Ibm	Power System E1050 (9043-mrx) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System E1080 (9080-hex) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System E1150 (9043-mru) Firmware	≥ fw1120.00 and < fw1120.02≥ fw1110.00 and < fw1110.32	Vulnerable	NIST National Vulnerability Database
Ibm	Power System E1180 (9080-heu) Firmware	≥ fw1120.00 and < fw1120.02≥ fw1110.00 and < fw1110.32	Vulnerable	NIST National Vulnerability Database
Ibm	Power System E950 (9040-mr9) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Power System E980 (9080-m9s) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Power System H922 (9223-22s) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Power System H924 (9223-42s) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Power System L1022 (9786-22h) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System L1024 (9786-42h) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System L1122 (9856-22h) Firmware	≥ fw1110.00 and < fw1110.32≥ fw1120.00 and < fw1120.02	Vulnerable	NIST National Vulnerability Database
Ibm	Power System L1124 (9856-42h) Firmware	≥ fw1110.00 and < fw1110.32≥ fw1120.00 and < fw1120.02	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1012 (9028-21b) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1014 (9105-41b) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1022 (9105-22a) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1022s (9105-22b) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1024 (9105-42a) Firmware	≥ fw1060.00 and < fw1060.82	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1112 (9242-21b) Firmware	≥ fw1120.00 and < fw1120.02	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1112 (9242-21t) Firmware	≥ fw1120.00 and < fw1120.02	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1114 (9824-41b) Firmware	≥ fw1120.00 and < fw1120.02≥ fw1110.00 and < fw1110.32	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1122 (9824-22a) Firmware	≥ fw1120.00 and < fw1120.02≥ fw1110.00 and < fw1110.32	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1122s (9824-22b) Firmware	≥ fw1120.00 and < fw1120.02≥ fw1110.00 and < fw1110.32	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S1124 (9824-42a) Firmware	≥ fw1120.00 and < fw1120.02≥ fw1110.00 and < fw1110.32	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S914 (9009-41g) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S922 (9009-22g) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Power System S924 (9009-42g) Firmware	≥ fw950.00 and < fw950.h4	Vulnerable	NIST National Vulnerability Database
Ibm	Powervm Hypervisor	≥ FW950.00 and ≤ FW950.H3≥ FW1060.00 and ≤ FW1060.81≥ FW1110.00 and ≤ FW1110.31≥ FW1120.00 and ≤ FW1120.01	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Local

Attack complexity

Low

Privileges required

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
5.1	CVSS 3.1	Medium	0.8	4.2	psirt@us.ibm.com via NIST National Vulnerability Database
5.1	CVSS 3.1	Medium	—	—	ibm via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H (score shown at the top: psirt@us.ibm.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-20 · Improper Input Validation

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.

endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

2026
Affected products added · ibm/powervm hypervisor
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
Fix documented
Oct 15, 2026 · NIST National Vulnerability Database
CVSS changed · 5.1
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 24, 2026 · ibm

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

www.ibm.com/support/pages/node/7289133
Patch, Vendor Advisory, vendor-advisory, patch, NIST National Vulnerability Database

Elsewhere on this site

Ibm
every CVE for this vendor

Input validation
same class

CWE-20
other pages naming this weakness

Related CVEs (same products)

High CVE-2026-96264 IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability in the... 3d
High CVE-2026-96266 IBM Power Systems Firmware Buffer Overflow 3d
High CVE-2026-96265 IBM Power Systems Firmware Improper Memory Buffer Restriction 3d
High CVE-2026-96262 IBM Power Systems Firmware FW1060.00 through FW1060.81 is affected by a vulnerability in the... 3d
High CVE-2026-96263 IBM Power Systems Firmware Buffer Overflow 3d
High CVE-2026-96261 IBM Power Systems Firmware Buffer Overflow 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-17503 is "This Power System update is being released to address", rated Medium. It affects Power System E1050 (9043-mrx) Firmware (Ibm); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 5.1 describes technical severity. EPSS 0.11% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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