SB2025100420 - Out-of-bounds read in Linux kernel iommu driver
Published: October 4, 2025
Security Bulletin ID
SB2025100420
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2025-39939)
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the zpci_get_iommu_ctrs() function in drivers/iommu/s390-iommu.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.