CVE-2026-80544

HIGHPre-NVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-27. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: 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/zcrypt: Improve EP11 CPRB domain handling with ASN.1 parsing

The zcrypt_msgtype6_send_ep11_cprb() function uses fragile struct overlays to access and modify the domain field in the EP11 CPRB payload, creating maintainability and security concerns:

  • Struct overlay approach (pld_hdr) assumes fixed payload structure
and doesn't validate the actual ASN.1 encoding.
  • Complex length format detection logic is error-prone and doesn't
properly validate bounds at each parsing step.
  • Direct struct member access bypasses proper ASN.1 validation.

Fix by replacing struct overlays with explicit ASN.1 parsing that validates each field (payload tag/length, function tag/length/value, optional domain tag/length/value) with proper bounds checking at every step. Add asn1_int_encode() helper function to safely write integer values with correct endianness conversion. This makes the code consistent with the validation pattern introduced with the rework of the xcrb_msg_to_type6_ep11cprb_msgx() function.

CVSS v3
7.8
EG Score
7.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity78% × 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 (2)

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

s390/zcrypt: Improve EP11 CPRB domain handling with ASN.1 parsing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/db21b2cf6dd0af5ffd08931e0a9fcda5a0473220
generic

s390/zcrypt: Improve EP11 CPRB domain handling with ASN.1 parsing - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0864a163783bff109b548266921829ea794edc93

Vendor Advisories for CVE-2026-80544(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 15× in last 7d / 15× 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 19:00 UTCGHSA enrichment
  3. 2026-08-29 06:53 UTCEG score recompute
  4. 2026-08-29 06:53 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 18:47 UTCGHSA enrichment
  7. 2026-08-28 06:38 UTCGHSA enrichment
  8. 2026-08-27 18:31 UTCEG score recompute
  9. 2026-08-27 18:30 UTCGHSA enrichment
  10. 2026-08-27 14:25 UTCEPSS rescore
  11. 2026-08-27 06:20 UTCEG score recompute▲ 7.80
  12. 2026-08-27 06:11 UTCMITRE cvelistV5CVSS v3 → 7.8 · severity → HIGH
  13. 2026-08-26 15:43 UTCNVD update
  14. 2026-08-26 14:43 UTCEG score recompute
  15. 2026-08-26 14:41 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-80544?
CVE-2026-80544 is a high vulnerability published on August 26, 2026. In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve EP11 CPRB domain handling with ASN.1 parsing The zcryptmsgtype6sendep11cprb() function uses fragile struct overlays to access and modify the domain field in the EP11 CPRB payload, creating maintainability and…
When was CVE-2026-80544 disclosed?
CVE-2026-80544 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-2026-80544 actively exploited?
CVE-2026-80544 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 96.2% of all scored CVEs.
What is the CVSS score of CVE-2026-80544?
CVE-2026-80544 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-80544?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80544, 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.

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