CVE-2026-80546

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 CCA CPRB length and overflow checks

The xcrb_msg_to_type6cprb_msgx() function lacks proper input validation, creating security vulnerabilities:

  • Integer overflow after CEIL4 alignment: Signed int variables could
overflow during 4-byte boundary alignment, causing undersized buffer allocations or incorrect bounds checking.
  • Missing minimum size validation: The CPRBX structure is copied from
userspace without verifying sufficient buffer length. Undersized buffers cause uninitialized memory access when reading structure fields like cprbx.cprb_len and cprbx.domain.
  • Arithmetic overflow in sum calculations: Adding control block and
data block sizes could overflow, bypassing size checks and enabling buffer overflows.

Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, validating minimum control block size before copying from userspace, and detecting sum calculation overflows.

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
3%
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 CCA CPRB length and overflow checks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/50fe5133dcb46449daf2435fa705264364411129
generic

s390/zcrypt: Improve CCA CPRB length and overflow checks - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/35ac6754ba6da45fd193f5ce3f665f7490b830d5

Vendor Advisories for CVE-2026-80546(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 18:04 UTCGHSA enrichment
  3. 2026-08-29 06:08 UTCEG score recompute
  4. 2026-08-29 06:07 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 18:09 UTCGHSA enrichment
  7. 2026-08-28 06:13 UTCGHSA enrichment
  8. 2026-08-27 18:16 UTCEG score recompute
  9. 2026-08-27 18:15 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-2026-80546?
CVE-2026-80546 is a high vulnerability published on August 26, 2026. In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Improve CCA CPRB length and overflow checks The xcrbmsgtotype6cprbmsgx() function lacks proper input validation, creating security vulnerabilities: 1. Integer overflow after CEIL4 alignment: Signed int variables could…
When was CVE-2026-80546 disclosed?
CVE-2026-80546 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-2026-80546 actively exploited?
CVE-2026-80546 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 96.7% of all scored CVEs.
What is the CVSS score of CVE-2026-80546?
CVE-2026-80546 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-80546?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-80546, 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

Explore the affected products and dependency analysis for CVE-2026-80546

Explore →

Is Your Infrastructure Affected by CVE-2026-80546?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs