SB2026082783 - Uncontrolled Recursion in Linux kernel s390 cio driver

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026082783

SB2026082783 - Uncontrolled Recursion in Linux kernel s390 cio driver

Published: August 27, 2026

Security Bulletin ID SB2026082783
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) Uncontrolled Recursion (CVE-ID: CVE-2026-80554)

CWE-ID: CWE-674 - Uncontrolled Recursion

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 remote attacker to execute arbitrary code.

The vulnerability exists due to uncontrolled recursion in vfio_ccw channel program processing when handling channel programs with many TIC-linked segments. A remote attacker can supply a crafted channel program to execute arbitrary code.

The issue arises because channel programs are processed recursively and segment counts created by Transfer-In-Channel (TIC) CCWs were not equivalently limited.


Remediation

Install update from vendor's website.

References