SB20260917157 - Missing Release of Resource after Effective Lifetime in Linux kernel drm nouveau driver
Published: September 17, 2026
Security Bulletin ID
SB20260917157
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-89804)
CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to leak IOMMU/IOVA mappings.
The vulnerability exists due to an incorrect DMA unmap size in the nouveau dmem migration teardown paths when unmapping migration buffers. A local user can trigger device-private transparent huge page migration to leak IOMMU/IOVA mappings.
The issue occurs for compound folios with an order greater than 0.
Remediation
Install update from vendor's website.