iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89450
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:25 UTC
Updated2026-09-11 20:19:25 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 d903d99ffd22b0180bd745a43f221c21bcdd8d7c git Not specified
CNA Linux Linux affected 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 445204550f894ca325ac80a21e3df177ad073798 git Not specified
CNA Linux Linux affected 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 4379610c79bd88ddbea10e7f6c21e16d4b338c6b git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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