CVE-2026-89450
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, the iommu/tegra241-cmdqv driver's tegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH, whose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag, so the hardware matches only a 20-bit Stream ID. The bound check rejects only virt_sid > UINT_MAX, admitting a value far wider than the field; the write "virt_sid << 1 | 0x1" then drops every bit above 20, so a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match on vSID 0, aliasing the wrong Stream ID. Because vdev->virt_id is guest-controlled, a VMM can trigger it.
Risk Assessment
A malicious VMM can trigger aliasing of the wrong Stream ID, potentially breaking isolation between virtual machines and enabling unauthorized device access.
Recommendation
Update the Linux kernel to a version with the fix that validates virt_sid against the field width with FIELD_MAX() and programs the register with FIELD_PREP() so the value and the field stay consistent.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field tegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH, whose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag. The HW therefore matches only a 20-bit Stream ID. The bound check rejects only virt_sid > UINT_MAX, which admits a value far wider than the field. The write "virt_sid << 1 | 0x1" then drops every bit above 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match on vSID 0, so the entry aliases the wrong Stream ID. Because vdev->virt_id is guest-controlled, a VMM can trigger it. Validate virt_sid against the field width with FIELD_MAX(), and program the register with FIELD_PREP() so the value and the field stay consistent.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS