SB2026082785 - Out-of-bounds write in Linux kernel s390 cio driver

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Main Vulnerability Database SB2026082785

SB2026082785 - Out-of-bounds write in Linux kernel s390 cio driver

Published: August 27, 2026

Security Bulletin ID SB2026082785
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) Out-of-bounds write (CVE-ID: CVE-2026-80552)

CWE-ID: CWE-787 - Out-of-bounds write

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 disclose sensitive information, modify memory, or cause a denial of service.

The vulnerability exists due to an out-of-bounds access in vfio_ccw region read and write handlers when processing read or write requests for vfio_ccw regions with an out-of-range region index. A local user can supply a crafted region index to disclose sensitive information, modify memory, or cause a denial of service.

The issue affects vfio_ccw read and write region handling on s390.


Remediation

Install update from vendor's website.

References