SB2026091701 - Incorrect Check of Function Return Value in Linux kernel s390 crypto driver

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Main Vulnerability Database SB2026091701

SB2026091701 - Incorrect Check of Function Return Value in Linux kernel s390 crypto driver

Published: September 17, 2026

Security Bulletin ID SB2026091701
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Incorrect Check of Function Return Value (CVE-ID: CVE-2026-89957)

CWE-ID: CWE-253 - Incorrect Check of Function Return Value

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 retain stale hardware access to AP devices removed from the host configuration.

The vulnerability exists due to incorrect handling of the bitmap_andnot() return value in vfio_ap_mdev_hot_unplug_cfg() when the last adapter, domain, or control domain assigned to an mdev is removed. A local user can remove the final assigned AP resource from the host configuration to retain stale hardware access to the unplugged AP devices.


Remediation

Install update from vendor's website.

References