SB2026091704 - Use-after-free in Linux kernel s390 crypto driver

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Main Vulnerability Database SB2026091704

SB2026091704 - Use-after-free in Linux kernel s390 crypto driver

Published: September 17, 2026

Security Bulletin ID SB2026091704
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) Use-after-free (CVE-ID: CVE-2026-89960)

CWE-ID: CWE-416 - Use After Free

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 compromise confidentiality, integrity, and availability.

The vulnerability exists due to a use-after-free in the s390 VFIO AP mediated-device KVM assignment handling when executing a PQAP instruction in a guest after a failed conflicting mediated-device assignment and subsequent freeing of the mediated device. A local user can trigger a conflicting mediated-device assignment and execute a PQAP instruction in the guest to compromise confidentiality, integrity, and availability.


Remediation

Install update from vendor's website.

References