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CVE-2026-68451: s390/zcrypt: Validate length for CCA ECC private key requests

highCVSS 8.8CVE-2026-68451

CSIRTS triage

vendor: Linuxproduct: Linux KernelMemory corruption
What
The s390/zcrypt cryptographic device driver does not validate length for CCA ECC private key requests, allowing buffer overflow.
Who is affected
IBM System z (s390) systems running Linux with zcrypt enabled using CCA ECC keys.
Urgency
High priority; CVSS 8.8 indicates high severity and buffer overflow can enable code execution.
Action
Apply Linux kernel patch to validate length in s390/zcrypt CCA ECC private key processing.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 8.8
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68451

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-68451coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for s390/zcrypt

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center