SB20260928196 - Incorrect Conversion between Numeric Types in Linux kernel iommu amd driver

Description

This security bulletin contains information about 1 vulnerability.

1) Incorrect Conversion between Numeric Types (CVE-ID: CVE-2026-98002)

CWE-ID: CWE-681 - Incorrect Conversion between Numeric Types

CVSSv4: 7.3 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a nested domain to be set up with an unallocated host domain ID.

The vulnerability exists due to incorrect conversion between numeric types in amd_iommu_alloc_domain_nested() when allocating a nested domain after host domain ID allocation fails. A local user can trigger nested domain allocation after host domain ID allocation fails to cause a nested domain to be set up with an unallocated host domain ID.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/80c231f5577229d1e90a1e312b3095f9502f8625
• https://git.kernel.org/stable/c/fa5c0827f0b7bac6d0a188f10118151769ae68fd