What’s Vulnerable › Vulnerabilities

CVE-2026-68452: s390/zcrypt: Validate length for CCA AES cipher key requests

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-13 · updated 2026-10-19
• Weakness: CWE-120

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.

Affected products

• Linux kernel: 5.4 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/06afe425d5283b9764303de47f554da5a808ce8a
• https://git.kernel.org/stable/c/3859f630b674801a00bca39bc451f52288591f65
• https://git.kernel.org/stable/c/406b317ea2b501f6f5eca1264293c9399a73a778
• https://git.kernel.org/stable/c/4e500ecb6704d879f9c2417c2ed6faba595015ca
• https://git.kernel.org/stable/c/4fc46deceda076d429ef3fab2ccf8d96629ebd23
• https://git.kernel.org/stable/c/7f9e5a3dbb14a9b321a1dfa30390402c673f82dc
• https://git.kernel.org/stable/c/ad93a1f1a45652478c0cf4eb029114e03af57f3b
• https://git.kernel.org/stable/c/be037204e4f595e4bd2159acda146677a1dc6342

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