CVE-2026-17091

HIGHPre-NVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-08-19. A secondary CVSS source baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.4EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 8.4Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

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 PowerVM hypervisor call interface. An attacker with root access to a guest partition can issue a specially crafted hypervisor call to inject an arbitrary amount of data into hypervisor or partition memory, resulting in either a crash causing a full platform re-IPL and terminating all hosted partitions, or corruption of hypervisor or partition memory. The PowerVM hypervisor will restart automatically; however, repeated exploitation could result in a sustained availability impact. Successful exploitation results in an integrity and availability impact to the managed system.

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 19, 2026

Last Modified

August 25, 2026

Advisory Details (1)

Auto-updated Aug 19, 2026
No patch confirmed yet.
generic

Security Bulletin: This Power System update is being released to address CVE-2026-17091

https://www.ibm.com/support/pages/node/7283229

Vendor Advisories for CVE-2026-17091(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 23× in last 7d / 93× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 158 total refreshes for this CVE.

  1. 2026-10-05 09:37 UTCEG score recompute
  2. 2026-10-05 09:37 UTCGHSA enrichment
  3. 2026-10-04 23:21 UTCEPSS rescore
  4. 2026-10-04 21:23 UTCGHSA enrichment
  5. 2026-10-04 05:07 UTCGHSA enrichment
  6. 2026-10-03 16:54 UTCEG score recompute
  7. 2026-10-03 16:54 UTCGHSA enrichment
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-03 00:41 UTCEG score recompute
  10. 2026-10-03 00:41 UTCGHSA enrichment
  11. 2026-10-02 11:06 UTCGHSA enrichment
  12. 2026-10-01 22:45 UTCEG score recompute
  13. 2026-10-01 22:45 UTCGHSA enrichment
  14. 2026-10-01 19:49 UTCEPSS rescore
  15. 2026-10-01 09:07 UTCGHSA enrichment
  16. 2026-09-30 20:52 UTCEG score recompute
  17. 2026-09-30 20:52 UTCGHSA enrichment
  18. 2026-09-30 15:02 UTCEPSS rescore
  19. 2026-09-30 08:38 UTCEG score recompute
  20. 2026-09-30 08:38 UTCGHSA enrichment
  21. 2026-09-29 15:20 UTCEPSS rescore
  22. 2026-09-28 21:41 UTCEG score recompute
  23. 2026-09-28 21:41 UTCGHSA enrichment
  24. 2026-09-28 13:51 UTCEPSS rescore
  25. 2026-09-28 06:27 UTCGHSA enrichment
Show 75 more
  1. 2026-09-27 18:13 UTCGHSA enrichment
  2. 2026-09-27 05:59 UTCEG score recompute
  3. 2026-09-27 05:59 UTCGHSA enrichment
  4. 2026-09-26 15:58 UTCEPSS rescore
  5. 2026-09-25 01:46 UTCEG score recompute
  6. 2026-09-25 01:46 UTCGHSA enrichment
  7. 2026-09-24 13:31 UTCGHSA enrichment
  8. 2026-09-24 01:09 UTCEG score recompute
  9. 2026-09-24 01:09 UTCGHSA enrichment
  10. 2026-09-23 12:55 UTCGHSA enrichment
  11. 2026-09-23 00:41 UTCEG score recompute
  12. 2026-09-23 00:41 UTCGHSA enrichment
  13. 2026-09-22 12:27 UTCGHSA enrichment
  14. 2026-09-22 00:13 UTCEG score recompute
  15. 2026-09-22 00:12 UTCGHSA enrichment
  16. 2026-09-21 11:54 UTCGHSA enrichment
  17. 2026-09-20 23:35 UTCGHSA enrichment
  18. 2026-09-20 10:57 UTCGHSA enrichment
  19. 2026-09-19 22:43 UTCEG score recompute
  20. 2026-09-19 22:43 UTCGHSA enrichment
  21. 2026-09-19 10:14 UTCGHSA enrichment
  22. 2026-09-18 21:57 UTCEG score recompute
  23. 2026-09-18 21:57 UTCGHSA enrichment
  24. 2026-09-18 19:27 UTCEPSS rescore
  25. 2026-09-18 09:43 UTCGHSA enrichment
  26. 2026-09-17 21:29 UTCEG score recompute
  27. 2026-09-17 21:29 UTCGHSA enrichment
  28. 2026-09-17 08:28 UTCGHSA enrichment
  29. 2026-09-16 20:05 UTCEG score recompute
  30. 2026-09-16 20:05 UTCGHSA enrichment
  31. 2026-09-16 14:07 UTCEPSS rescore
  32. 2026-09-16 07:04 UTCEG score recompute
  33. 2026-09-16 07:04 UTCGHSA enrichment
  34. 2026-09-16 05:14 UTCEPSS rescore
  35. 2026-09-15 18:50 UTCGHSA enrichment
  36. 2026-09-15 05:48 UTCEG score recompute
  37. 2026-09-15 05:48 UTCGHSA enrichment
  38. 2026-09-14 17:12 UTCGHSA enrichment
  39. 2026-09-14 04:58 UTCEG score recompute
  40. 2026-09-14 04:58 UTCGHSA enrichment
  41. 2026-09-13 16:46 UTCEPSS rescore
  42. 2026-09-13 16:44 UTCGHSA enrichment
  43. 2026-09-13 04:30 UTCGHSA enrichment
  44. 2026-09-12 16:15 UTCGHSA enrichment
  45. 2026-09-12 04:00 UTCGHSA enrichment
  46. 2026-09-11 15:45 UTCEG score recompute
  47. 2026-09-11 15:45 UTCGHSA enrichment
  48. 2026-09-11 14:52 UTCEPSS rescore
  49. 2026-09-11 09:36 UTCEPSS rescore
  50. 2026-09-11 03:30 UTCGHSA enrichment
  51. 2026-09-10 15:16 UTCEG score recompute
  52. 2026-09-10 15:16 UTCGHSA enrichment
  53. 2026-09-10 09:34 UTCEPSS rescore
  54. 2026-09-10 03:01 UTCGHSA enrichment
  55. 2026-09-09 14:46 UTCGHSA enrichment
  56. 2026-09-09 02:31 UTCEG score recompute
  57. 2026-09-09 02:31 UTCGHSA enrichment
  58. 2026-09-08 22:00 UTCEPSS rescore
  59. 2026-09-07 21:25 UTCEG score recompute
  60. 2026-09-07 21:25 UTCGHSA enrichment
  61. 2026-09-07 16:01 UTCEPSS rescore
  62. 2026-09-07 09:10 UTCGHSA enrichment
  63. 2026-09-06 20:31 UTCEG score recompute
  64. 2026-09-06 20:31 UTCGHSA enrichment
  65. 2026-09-06 13:47 UTCEPSS rescore
  66. 2026-09-06 08:15 UTCGHSA enrichment
  67. 2026-09-05 20:00 UTCEG score recompute
  68. 2026-09-05 20:00 UTCGHSA enrichment
  69. 2026-09-05 07:45 UTCGHSA enrichment
  70. 2026-09-04 19:31 UTCEG score recompute
  71. 2026-09-04 19:31 UTCGHSA enrichment
  72. 2026-09-04 07:14 UTCEG score recompute
  73. 2026-09-04 07:14 UTCGHSA enrichment
  74. 2026-09-04 05:06 UTCEPSS rescore
  75. 2026-09-03 18:12 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-17091?
CVE-2026-17091 is a high vulnerability published on August 19, 2026. 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 PowerVM hypervisor call interface. An attacker with root access to a guest partition can issue a specially crafted hypervisor call to…
When was CVE-2026-17091 disclosed?
CVE-2026-17091 was first published on August 19, 2026, with the most recent update on August 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-17091 actively exploited?
CVE-2026-17091 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-17091?
CVE-2026-17091 has a CVSS base score of 8.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-17091?
No fix for CVE-2026-17091 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-17091 are linked in the Vendor Advisories panel on this page.

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