SB2026082791 - Improper input validation in Linux kernel s390 crypto driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-80544)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to disclose sensitive information, modify data, or cause a denial of service.

The vulnerability exists due to improper input validation in zcrypt_msgtype6_send_ep11_cprb() when parsing ASN.1-encoded EP11 CPRB payloads. A local user can provide a specially crafted payload to disclose sensitive information, modify data, or cause a denial of service.

The issue affects domain field handling for non-management commands.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/0864a163783bff109b548266921829ea794edc93
• https://git.kernel.org/stable/c/db21b2cf6dd0af5ffd08931e0a9fcda5a0473220