CVE-2026-4936: IBM Power System e1050 (9043-Mrx) Firmware

Medium severity, CVSS 6.2. EPSS: 0.1% chance of exploitation in the next 30 days.

IBM PowerVM Hypervisor Platform KeyStore (PKS) and virtual TPM FW1110.00 through FW1110.20, FW1060.00 through FW1060.71, and FW950.00 through FW950.H2 use persistent storage key seeds that result in an AES key with reduced strength. An attacker with access to the service processor or HMC could exploit this weakness to derive the encryption key and access the data.

Affected products

  • IBM Power System e1050 (9043-Mrx) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System e1080 (9080-Hex) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System e1150 (9043-Mru) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System e1180 (9080-Heu) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System e950 (9040-MR9) Firmware: from fw950.00, before fw950.h3 (fixed in fw950.h3)
  • IBM Power System e980 (9080-m9s) Firmware: from fw950.00, before fw950.h3 (fixed in fw950.h3)
  • IBM Power System h922 (9223-22s) Firmware: from fw950.00, before fw950.h3 (fixed in fw950.h3)
  • IBM Power System h924 (9223-42s) Firmware: from fw950.00, before fw950.h3 (fixed in fw950.h3)
  • IBM Power System l1022 (9786-22h) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System l1024 (9786-42h) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System l1122 (9856-22h) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System l1124 (9856-42h) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System s1012 (9028-21b) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System s1014 (9105-41b) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System s1022 (9105-22a) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System s1022s (9105-22b) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System s1024 (9105-42a) Firmware: from fw1060.00, before fw1060.72 (fixed in fw1060.72)
  • IBM Power System s1112 (9242-21b) Firmware: version fw1120.00 only
  • IBM Power System s1112 (9242-21t) Firmware: version fw1120.00 only
  • IBM Power System s1114 (9824-41b) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System s1122 (9824-22a) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System s1122s (9824-22b) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System s1124 (9824-42a) Firmware: from fw1110.00, before fw1110.30 (fixed in fw1110.30); version fw1120.00 only
  • IBM Power System s914 (9009-41g) Firmware: from fw950.00, before fw950.h3 (fixed in fw950.h3)
  • IBM Power System s922 (9009-22g) Firmware: from fw950.00, before fw950.h3 (fixed in fw950.h3)
  • and 1 more

Published 2026-08-19. Last modified 2026-08-25.