CVE-2026-80555

HIGHPre-NVD 7.17.1—
EchelonGraph scoreHIGH confidence

Score 7.1 from GitHub Security Advisory (severity: HIGH) published 2026-08-27. a secondary CVSS source baseline 7.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

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

In the Linux kernel, the following vulnerability has been resolved:

s390/vfio_ccw: Free all memory if cp_init() fails

The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cp_prefetch() fails. But if cp_init() fails, and cp->initialized is not enabled, the same routine cannot be used to free all the memory.

An attempt to address this exists in ccwchain_handle_ccw(), where a single call to ccwchain_free() is made for the currently-processed CCW segment. But this will leak other segments (created as a result of a Transfer in Channel) that had been allocated as part of the same channel program.

Address this by performing the cleanup outside of the recursive ccwchain_handle_ccw()/ccwchain_loop_tic() logic.

CVSS v3
7.1
EG Score
7.1(high)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

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
Severity71% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

August 26, 2026

Last Modified

August 27, 2026

Advisory Details (4)

Auto-updated Aug 27, 2026
No patch confirmed yet.
generic

s390/vfio_ccw: Free all memory if cp_init() fails - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/74186c2968f8f756ac3226b545b598457c910c75
generic

s390/vfio_ccw: Free all memory if cp_init() fails - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/6a917199aaf97904f5619afe3dfdacb155b03e8c
generic

s390/vfio_ccw: Free all memory if cp_init() fails - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/4699b54fada156534cbb39834d47fc9374d7a1f5
generic

s390/vfio_ccw: Free all memory if cp_init() fails - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/32e3d364a7b8295120d37e6a6bd433d2de26f748

Vendor Advisories for CVE-2026-80555(1)

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

Data Freshness Timeline

(refreshed 19× in last 7d / 19× 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.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 23:13 UTCGHSA enrichment
  3. 2026-08-29 11:42 UTCGHSA enrichment
  4. 2026-08-29 00:11 UTCEG score recompute
  5. 2026-08-29 00:11 UTCGHSA enrichment
  6. 2026-08-28 21:42 UTCEPSS rescore
  7. 2026-08-28 12:38 UTCGHSA enrichment
  8. 2026-08-28 01:06 UTCEG score recompute
  9. 2026-08-28 01:05 UTCGHSA enrichment
  10. 2026-08-27 14:25 UTCEPSS rescore
  11. 2026-08-27 13:33 UTCEG score recompute
  12. 2026-08-27 13:33 UTCGHSA enrichment
  13. 2026-08-27 13:00 UTCEG score recompute
  14. 2026-08-27 13:00 UTCGHSA enrichment
  15. 2026-08-27 06:19 UTCEG score recompute▲ 7.10
  16. 2026-08-27 06:11 UTCMITRE cvelistV5CVSS v3 → 7.1 · severity → HIGH
  17. 2026-08-26 15:43 UTCNVD update
  18. 2026-08-26 14:42 UTCEG score recompute
  19. 2026-08-26 14:41 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-80555?
CVE-2026-80555 is a high vulnerability published on August 26, 2026. In the Linux kernel, the following vulnerability has been resolved: s390/vfioccw: Free all memory if cpinit() fails The routine cp_free() is called to unpin/free any memory once an I/O is completed successfully, or if cpprefetch() fails. But if cpinit() fails, and cp->initialized is not enabled,…
When was CVE-2026-80555 disclosed?
CVE-2026-80555 was first published in the National Vulnerability Database on August 26, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-80555 actively exploited?
CVE-2026-80555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 96.3% of all scored CVEs.
What is the CVSS score of CVE-2026-80555?
CVE-2026-80555 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-80555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80555, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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