CVE-2026-98002 iommu/amd: Fix ineffective error check in nested domain allocation
An integer overflow in AMD IOMMU nested domain allocation causes error checks to fail, potentially leading to undefined behavior or resource exhaustion.
- 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-2026-98002?
CVE-2026-98002 is a high-severity vulnerability in Linux, published on 25 Sep 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/amd: Fix ineffective error check in nested domain allocation
amd_iommu_pdom_id_alloc() returns an int: a domain ID on success, or the negative errno from ida_alloc_range() when the ID space is exhausted or memory is short. amd_iommu_alloc_domain_nested() stores that return value in gdom_info->hdom_id, which is a u32, and only then tests it:
gdom_info->hdom_id = amd_iommu_pdom_id_alloc(); if (gdom_info->hdom_id <= 0) {
The assignment discards the sign, so -ENOSPC becomes 0xffffffe4 and the test never fires. The nested domain is then set up with a host domain ID that was never allocated, instead of the allocation failing with -ENOSPC.
Keep the value in an int, test it there, and store it only once it is known to be valid, which is what the other amd_iommu_pdom_id_alloc() callers already do.
Which versions are affected by CVE-2026-98002?
How do I fix CVE-2026-98002?
Apply the vendor's patch.
Is CVE-2026-98002 being exploited?
There is no known exploitation of CVE-2026-98002 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-98002, GHSA-38jm-2gpc-m9wh, UBUNTU-CVE-2026-98002.