CVE-2026-80545

Summary

In the Linux kernel, the following vulnerability has been resolved:

s390/zcrypt: Improve EP11 CPRB length and overflow checks

The xcrb_msg_to_type6_ep11cprb_msgx() function lacks proper input validation, creating security vulnerabilities:

1. Missing minimum size validation: The ep11_cprb structure and subsequent payload fields (pld_tag, pld_lenfmt) are copied from userspace without verifying sufficient buffer length.
2. Arithmetic overflow in length calculations: CEIL4 alignment could overflow, bypassing size checks and enabling buffer overflows.
3. The payload is asn1 encoded but the function just uses a simple c struct overlay to access some fields of the payload.

Fix by using size_t for length calculations, adding U32_MAX boundary checks after alignment, and validating minimum request size and minimum reply size before copying from userspace. Do a very simple asn1 parsing of the payload up to the function value field.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/2976b9d2e716c7e5487ca7c29a7bd076cf9adf08
• https://git.kernel.org/stable/c/17ac0bc866fc624cd05f022dcd8b730c0af11bb1

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