SB20260815146 - Use-after-free in Linux kernel iommu iommufd driver
Published: August 15, 2026
Security Bulletin ID
SB20260815146
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) Use-after-free (CVE-ID: CVE-2026-74328)
CWE-ID: CWE-416 - Use After Free
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 a use-after-free in the iommufd pages release logic when detaching from a dma-buf. A local user can trigger dma-buf invalidation callbacks during page release to cause a denial of service.
The issue occurs because the mutex could still be in use through dma-buf invalidation callbacks before the dma-buf is fully detached.
Remediation
Install update from vendor's website.