CVE-2023-34326 x86/AMD: missing IOMMU TLB flushing
Missing IOMMU TLB flushing in Xen allows devices to access unauthorized memory regions via stale DMA mappings, leading to information disclosure.
- 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-2023-34326?
CVE-2023-34326 is a high-severity vulnerability in Xen Xen, published on 5 Jan 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The caching invalidation guidelines from the AMD-Vi specification (48882—Rev 3.07-PUB—Oct 2022) is incorrect on some hardware, as devices will malfunction (see stale DMA mappings) if some fields of the DTE are updated but the IOMMU TLB is not flushed.
Such stale DMA mappings can point to memory ranges not owned by the guest, thus allowing access to unindented memory regions.
Weakness: CWE-672
Which versions are affected by CVE-2023-34326?
It affects 1 product.
Products include Xen Xen.
How do I fix CVE-2023-34326?
Apply the vendor's patch.
Is CVE-2023-34326 being exploited?
There is no known exploitation of CVE-2023-34326 in the wild and no public exploit code.
Other vulnerabilities in Xen Xen
Sources
Also known as ALPINE-CVE-2023-34326, DEBIAN-CVE-2023-34326, GHSA-mjvw-frxx-6hm5, UBUNTU-CVE-2023-34326.