Low Memory corruption

CVE-2026-18857 — Out-of-bounds Read in Ibm Power System E1050 (9043-mrx) Firmware

IBM OPENBMC FW1120.00 through FW1120.01, FW1110.00 through FW1110.31, and FW1060.00 through FW1060.81 is affected by a vulnerability in the BMC firmware management interface. The host system can cause the BMC firmware management service to crash or allow a limited amount of BMC internal memory to be read, resulting in a confidentiality and availability impact to the managed system.

Published Sep 24, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database · CNA: psirt@us.ibm.com

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

No scoring signals.

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

—

No EPSS score.

Affects

Ibm

Power System E1050 (9043-mrx) Firmware and 16 more

CVSS base

3.4

Low · 1 source(s)

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 E1150 (9043-mru) Firmware, Ibm Power System L1022 (9786-22h) Firmware…).
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (memory corruption), 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 E1150 (9043-mru) Firmware	≥ fw1110.00 and < fw1110.32≥ fw1120.00 and < fw1120.02	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

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

Low

Integrity

None

Availability

Low

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
3.4	CVSS 3.1	Low	0.8	2.5	psirt@us.ibm.com via NIST National Vulnerability Database

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

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-125 · Out-of-bounds Read

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.
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

endpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Fix documented
Oct 15, 2026 · NIST National Vulnerability Database
CVSS changed · 3.4
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 · psirt@us.ibm.com

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/7289253
Patch, Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Ibm
every CVE for this vendor

Memory corruption
same class

CWE-125
other pages naming this weakness

Related CVEs (same products)

Low CVE-2026-19492 Use of Uninitialized Variable in Ibm Power System S1122 (9824-22a) Firmware 21d
Medium CVE-2026-18870 Out-of-bounds Read in Ibm Power System S1122 (9824-22a) Firmware 21d
Medium CVE-2026-17503 Improper Input Validation in Ibm Power System S1122 (9824-22a) Firmware 21d
Medium CVE-2026-17504 Integer Underflow in Ibm Power System S1122 (9824-22a) Firmware 21d
Low CVE-2026-17511 IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31… 21d
Medium CVE-2026-17413 IBM PowerVM Hypervisor FW1120.00 through FW1120.01, FW1110.00 through FW1110.31… 21d

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 FIRST EPSS score.
No CISA SSVC assessment.
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-2026-18857 is "Out-of-bounds Read in Ibm Power System E1050 (9043-mrx) Firmware", rated Low. 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 3.4 describes technical severity. 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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