SB20260812177 - Improper locking in Linux kernel iommu amd driver
Published: August 12, 2026
Security Bulletin ID
SB20260812177
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 locking (CVE-ID: CVE-2026-68347)
CWE-ID: CWE-667 - Improper Locking
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 locking in the AMD IOMMU nested domain allocation and free paths when handling ioctl requests and domain teardown. A local user can trigger lock ordering violations to cause a denial of service.
The issue involves HARDIRQ-safe to HARDIRQ-unsafe lock ordering in gdom allocation and the IOMMU_DESTROY free path.
Remediation
Install update from vendor's website.