CVE-2026-45862 iommu/vt-d: Flush cache for PASID table before using it
A race condition in the Linux kernel IOMMU driver allows non-coherent hardware to read uninitialized memory, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45862?
CVE-2026-45862 is a high-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-362
Which versions are affected by CVE-2026-45862?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-45862?
Apply the vendor's patch.
Is CVE-2026-45862 being exploited?
There is no known exploitation of CVE-2026-45862 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-45862, DEBIAN-CVE-2026-45862, GHSA-qqmx-g3hj-x9h7, ROOT-OS-DEBIAN-11-CVE-2026-45862, ROOT-OS-UBUNTU-2204-CVE-2026-45862, ROOT-OS-UBUNTU-2404-CVE-2026-45862 and 1 more.