Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-89804
Published: September 17, 2026
Vulnerability identifier: #VU150479
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89804
CWE-ID: CWE-772
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89804
Install security update from vendor's repository.