CVE-2026-98002

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References