SB20260928341 - Always-Incorrect Control Flow Implementation in Linux kernel s390 crypto

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-97589)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to compromise confidentiality, integrity, and availability.

The vulnerability exists due to incorrect callback return-value handling in s390 asynchronous crypto engine callbacks when completing asynchronous cryptographic requests. A local user can cause a request to be completed twice to compromise confidentiality, integrity, and availability.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5480291aa848e19e61175abfd457933516db70c6
• https://git.kernel.org/stable/c/972e0d9b7d1d112240ccde1f1be85bf9ffaa1720
• https://git.kernel.org/stable/c/ac1481320110b803ab9b79ab4d2ca11a74fc05f2