SB2026052893 - Use-after-free in Linux kernel s390 cio driver

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Main Vulnerability Database SB2026052893

SB2026052893 - Use-after-free in Linux kernel s390 cio driver

Published: May 28, 2026

Security Bulletin ID SB2026052893
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-45981)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free or double free in css_alloc_subchannel() when handling failures from DMA mask setup. A local user can trigger the affected error path to cause a denial of service.

The issue occurs after device_initialize() has been called and the embedded device object is freed directly instead of being released through the device model reference counting mechanism.


Remediation

Install update from vendor's website.

References