Use-after-free in Linux kernel - CVE-2026-53281
Published: June 29, 2026
Vulnerability identifier: #VU135758
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-53281
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service or execute arbitrary code.
The vulnerability exists due to a NULL pointer dereference and use-after-free in the Intel VT-d IOMMU PASID teardown logic when detaching a domain that was not attached to the IOMMU or when a PASID entry is not found. A local user can trigger teardown operations on an invalid or missing PASID association to cause a denial of service or execute arbitrary code.
The issue can also corrupt reference counts, which may prematurely drop a shared domain reference to zero for remaining active devices.
How to mitigate CVE-2026-53281
Install security update from vendor's repository.