CVE-2026-68452
Received Received - Intake

s390/zcrypt CCA AES Cipher Key Length Validation Flaw

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Validate length for CCA AES cipher key requests cca_cipher2protkey() derives the copy length for the CPRB parameter block directly from the length field in the key token. Reject the request early if the token length exceeds the available space in the parameter block.

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-68452
EUVD
EUVD-2026-57921

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves improper validation of key token length in s390/zcrypt for CCA AES cipher key requests. The function cca_cipher2protkey() uses the token length directly to determine copy length without checking if it exceeds the available space in the parameter block, potentially leading to buffer overflow or memory corruption.

Impact Analysis

This vulnerability could allow an attacker with local access to cause a denial of service, escalate privileges, or execute arbitrary code on affected systems by exploiting the improper length validation in cryptographic operations.

Mitigation Strategies

Apply the Linux kernel patch that resolves this vulnerability to prevent potential exploitation of the s390/zcrypt CCA AES cipher key request flaw.

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