SB20260727292 - Improper input validation in Linux kernel iommu iommufd driver
Published: July 27, 2026
Security Bulletin ID
SB20260727292
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) Improper input validation (CVE-ID: CVE-2026-64291)
CWE-ID: CWE-20 - Improper input validation
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 improper input validation in iommufd_veventq_alloc() when allocating a virtual event queue with a user-supplied veventq_depth value. A local user can provide an excessively large queue depth value to cause a denial of service.
Remediation
Install update from vendor's website.