SB2026100413 - Improper Check for Unusual or Exceptional Conditions in Linux kernel s390 crypto

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-97591)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause incorrect handling of PHMAC hash requests.

The vulnerability exists due to improper handling of an exceptional return code in PHMAC crypto request handling when a hash request transferred to the crypto engine returns EBUSY. A local user can submit a PHMAC hash request that is transferred to the crypto engine to cause incorrect handling of PHMAC hash requests.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/203702f0013f9b7324e8c5facb6cd6e9c0942b13
• https://git.kernel.org/stable/c/330148371401de474b656eaf521861f12ec1a1ce
• https://git.kernel.org/stable/c/bcd7f1f1e2f2882ad206f72425255be105178151