Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-05-27T00:00:00 kernel: iommu/vt-d: Flush cache for PASID table before using it 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-821

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush cache for PASID table before using it When writing the address of a freshly allocated zero-initialized PASID table to a PASID directory entry, do that after the CPU cache flush for this PASID table, not before it, to avoid the time window when this PASID table may be already used by non-coherent IOMMU hardware while its contents in RAM is still some random old data, not zero-initialized.

A flaw was found in the Linux kernel's IOMMU (Input/Output Memory Management Unit) virtualized directed I/O (VT-d) component. When a freshly allocated PASID (Process Address Space ID) table is written to a directory entry, the CPU cache flush for this table occurs too late. This creates a time window where non-coherent IOMMU hardware might use the PASID table while its contents in memory are still uninitialized or contain old, random data. This could lead to data integrity issues or system instability.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Fix deferred kernel Red Hat Enterprise Linux 8 Fix deferred kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-45862 https://nvd.nist.gov/vuln/detail/CVE-2026-45862 https://lore.kernel.org/linux-cve-announce/2026052711-CVE-2026-45862-6bdd@gregkh/T