Use-after-free in Linux kernel - CVE-2026-90240
Published: September 18, 2026
Vulnerability identifier: #VU151251
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-90240
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause the IOMMU to access freed memory.
The vulnerability exists due to improper context-cache invalidation in the Intel VT-d IOMMU context-cache invalidation logic when tearing down DMA aliases. A local user can trigger teardown of a device with DMA aliases to cause the IOMMU to access freed memory.
In scalable mode, a stale cached context entry can continue to reference a freed PASID directory.
Affected software
Linux kernel
How to mitigate CVE-2026-90240
Install security update from vendor's repository.