CVE-2026-98002
HighCVSS 7.8Summary
In the Linux kernel iommu/amd driver, amd_iommu_pdom_id_alloc() returns an int (domain ID or negative errno), but amd_iommu_alloc_domain_nested() stores the result in the u32 field gdom_info->hdom_id, discarding the sign. As a result, -ENOSPC becomes 0xffffffe4 and the "<= 0" test never fires, so the nested domain is set up with an unallocated ID. The fix keeps the value in an int, tests it, and stores it only after validation.
Risk Assessment
A failed domain ID allocation is not detected, leading to use of an unallocated identifier and potential IOMMU state corruption. This may result in incorrect address translation or system instability.
Recommendation
Update the Linux kernel to a version containing the fix. On AMD systems with IOMMU and nested virtualization, prioritizing this update is recommended.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS