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Fencer Vulns
high 7.3

CVE-2026-18871 json

Power System Buffer Overflow

published 2026-08-19 2 mo ago modified 2026-08-25 2 mo ago also EUVD-2026-62743

cvss
7.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 3%
public exploits
0
none known

Summary

IBM PowerVM Hypervisor FW1120.00, FW1110.00 through FW1110.30, and FW1060.00 through FW1060.80 is affected by a vulnerability in host firmware configuration parsing. An attacker with authenticated service-level access to the service processor can write specially crafted configuration data, causing the host firmware boot stack to crash with possible memory corruption during system initialisation, resulting in an integrity and availability impact to the managed system.

Patch / fix

  • ibm power_system_s1122_(9824-22a)_firmware fw1110.31
  • ibm power_system_s1124_(9824-42a)_firmware fw1110.31
  • ibm power_system_s1122s_(9824-22b)_firmware fw1110.31
  • ibm power_system_s1114_(9824-41b)_firmware fw1110.31
  • ibm power_system_l1122_(9856-22h)_firmware fw1110.31
  • ibm power_system_l1124_(9856-42h)_firmware fw1110.31
  • ibm power_system_e1150_(9043-mru)_firmware fw1110.31
  • ibm power_system_e1080_(9080-hex)_firmware fw1060.81
  • ibm power_system_s1022_(9105-22a)_firmware fw1060.81
  • ibm power_system_s1024_(9105-42a)_firmware fw1060.81
  • ibm power_system_s1022s_(9105-22b)_firmware fw1060.81
  • ibm power_system_s1014_(9105-41b)_firmware fw1060.81
  • ibm power_system_l1022_(9786-22h)_firmware fw1060.81
  • ibm power_system_l1024_(9786-42h)_firmware fw1060.81
  • ibm power_system_e1050_(9043-mrx)_firmware fw1060.81
  • ibm power_system_s1012_(9028-21b)_firmware fw1060.81
  • ibm power_system_e1180_(9080-heu)_firmware fw1110.31

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

Affected products

  • IBM PowerVM Hypervisor

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.