SB20260816142 - Out-of-bounds read in Linux kernel arm arm-smmu-v3 driver
Published: August 16, 2026
Security Bulletin ID
SB20260816142
CSH 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 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-74573)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in arm_vsmmu_vsid_to_sid() in the arm-smmu-v3 iommufd code when initializing or using a vDEVICE backed by a device with no stream IDs. A local user can create or use such a vDEVICE to cause a denial of service.
The issue occurs because the code assumes a device has exactly one stream ID.
Remediation
Install update from vendor's website.