What’s Vulnerable › Vulnerabilities

CVE-2026-74466: s390/zcrypt: Close speculative mem read possibility

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: s390/zcrypt: Close speculative mem read possibility The domain value is extracted from a given CCA or EP11 ioctl struct when a CPRB is about to be sent. Thus this is a user controlled value. Under some special conditions (custom device node used, administrative load) this value is used as an array index after bounds checking, but without speculation barrier. Add the missing array_index_nospec() call to prevent speculative execution where this domain value is used.

Affected products

• Linux: 5.18 — fixed in 7.2

How to fix

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

References

• https://git.kernel.org/stable/c/55ac533c568a5dcaa41cd26d6e089f9dff2a7c22
• https://git.kernel.org/stable/c/59adeedebf02aa1c203de1d2b67ec45bfab7a3c6
• https://git.kernel.org/stable/c/82b62eda68abfb7a33ac40f24b8c4128c2891148
• https://git.kernel.org/stable/c/d11a260bd7dfc6f6ccd43e1b930050f24e70cd5f
• https://git.kernel.org/stable/c/dd1a334523ba533cba63caf593a7329d8e0e5e6e
• https://git.kernel.org/stable/c/e935cd525af4c6ed2e2c6404aa27ca19c7f39ddb

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