Power System Out-of-bounds Read
IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, FW1060.00 through FW1060.80, and FW950.00 through FW950.H2 is affected by a vulnerability in the service processor mailbox interface. An attacker with authenticated service-level access to the FSP can send a specially crafted mailbox message to read or modify arbitrary regions of Hostboot memory, compromising the host firmware boot stack and the hypervisor subsequently loaded by it. Successful exploitation results in a confidentiality, integrity, and availability impact to the managed system.
- Published
- Aug 19, 2026
- Updated
- Aug 25, 2026
- EPSS
- 0.2% · 6th percentile
- CWE
- CWE-125
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Report tools
Action score
32
Monitor
Low priority for now.
- CVSS
- 32 / 40 · 8.2 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · ibm
- 8.2
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| ibm | power system s1122 \(9824-22a\) firmware | cpe:2.3:o:ibm:power_system_s1122_\(9824-22a\)_firmware |
| ibm | power system s1122 \(9824-22a\) | cpe:2.3:h:ibm:power_system_s1122_\(9824-22a\) |
| ibm | power system s1124 \(9824-42a\) firmware | cpe:2.3:o:ibm:power_system_s1124_\(9824-42a\)_firmware |
| ibm | power system s1124 \(9824-42a\) | cpe:2.3:h:ibm:power_system_s1124_\(9824-42a\) |
| ibm | power system s1122s \(9824-22b\) firmware | cpe:2.3:o:ibm:power_system_s1122s_\(9824-22b\)_firmware |
| ibm | power system s1122s \(9824-22b\) | cpe:2.3:h:ibm:power_system_s1122s_\(9824-22b\) |
| ibm | power system s1114 \(9824-41b\) firmware | cpe:2.3:o:ibm:power_system_s1114_\(9824-41b\)_firmware |
| ibm | power system s1114 \(9824-41b\) | cpe:2.3:h:ibm:power_system_s1114_\(9824-41b\) |
| ibm | power system l1122 \(9856-22h\) firmware | cpe:2.3:o:ibm:power_system_l1122_\(9856-22h\)_firmware |
| ibm | power system l1122 \(9856-22h\) | cpe:2.3:h:ibm:power_system_l1122_\(9856-22h\) |
| ibm | power system l1124 \(9856-42h\) firmware | cpe:2.3:o:ibm:power_system_l1124_\(9856-42h\)_firmware |
| ibm | power system l1124 \(9856-42h\) | cpe:2.3:h:ibm:power_system_l1124_\(9856-42h\) |
and 40 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- ibm power system e1050 (9043-mrx) firmwarefw1060.00 and later · before fw1060.81
- ibm power system e1080 (9080-hex) firmwarefw1060.00 and later · before fw1060.81
- ibm power system e1150 (9043-mru) firmwarefw1110.00 and later · before fw1110.31
- ibm power system e1150 (9043-mru) firmwarefw1120.00
- ibm power system e1180 (9080-heu) firmwarefw1110.00 and later · before fw1110.31
- ibm power system e1180 (9080-heu) firmwarefw1120.00
- ibm power system e950 (9040-mr9) firmwarefw950.00 and later · before fw950.h3
- ibm power system e980 (9080-m9s) firmwarefw950.00 and later · before fw950.h3
- ibm power system h922 (9223-22s) firmwarefw950.00 and later · before fw950.h3
- ibm power system h924 (9223-42s) firmwarefw950.00 and later · before fw950.h3
- ibm power system l1022 (9786-22h) firmwarefw1060.00 and later · before fw1060.81
- ibm power system l1024 (9786-42h) firmwarefw1060.00 and later · before fw1060.81
- ibm power system l1122 (9856-22h) firmwarefw1110.00 and later · before fw1110.31
- ibm power system l1122 (9856-22h) firmwarefw1120.00
- ibm power system l1124 (9856-42h) firmwarefw1110.00 and later · before fw1110.31
- ibm power system l1124 (9856-42h) firmwarefw1120.00
- ibm power system s1012 (9028-21b) firmwarefw1060.00 and later · before fw1060.81
- ibm power system s1014 (9105-41b) firmwarefw1060.00 and later · before fw1060.81
- ibm power system s1022 (9105-22a) firmwarefw1060.00 and later · before fw1060.81
- ibm power system s1022s (9105-22b) firmwarefw1060.00 and later · before fw1060.81
Versions reported by the vendor
Affected version ranges reported by the assigning authority (ibm). Independent of NVD's CPE analysis and usually ahead of it.
IBM PowerVM Hypervisor
- FW1120.00affected
- FW1110.00 and later · up to and including FW1110.30affected · semver
- FW1060.00 and later · up to and including FW1060.80affected · semver
- FW950.00 and later · up to and including FW950.H2affected · semver
Same product
ibm: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-18821Power System Out-of-bounds Write35Monitor
- CVE-2026-17414Power System Improper Input Validation35Monitor
- CVE-2026-7868This Power System update is being released to address incorrect authorization35Monitor
- CVE-2026-17091Power System Integer Overflow33Monitor
- CVE-2026-11885Power System update in Buffer Copy33Monitor
- CVE-2026-16933Power System Integer Overflow32Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-170280 days apartPower System Out-of-bounds Read26Monitor
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- Administrator privileges are required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
Impact can extend beyond the vulnerable component (scope changes).
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- High
- User interaction
- None
- Scope
- Changed
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
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Change log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
Vendor advisories and official records. Exploit/PoC links are deliberately left out.