Stream ID aliasing via truncated guest vSID
Published Sep 11, 2026 · Updated Sep 11, 2026
Improper vSID validation in Linux 6.17 allows attackers to alias an unintended Stream ID through a virtual IOMMU request. tegra241_vintf_init_vsid() accepts a 32-bit guest value, shifts it into the 20-bit SID_MATCH field, and silently discards the upper bits. Exploitation requires a VMM controlling vdev->virt_id on Tegra241 CMDQV hardware; the public record establishes Stream ID misassociation but does not specify its security consequence.
Summary
What happened
Improper vSID validation in Linux 6.17 allows attackers to alias an unintended Stream ID through a virtual IOMMU request. tegra241_vintf_init_vsid() accepts a 32-bit guest value, shifts it into the 20-bit SID_MATCH field, and silently discards the upper bits. Exploitation requires a VMM controlling vdev->virt_id on Tegra241 CMDQV hardware; the public record establishes Stream ID misassociation but does not specify its security consequence.
The record
- CVE
- CVE-2026-89450
- Published
- Sep 11, 2026
- Updated
- Sep 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 11, 2026CVE publishedPublication date reported by the CVE source.
- Sep 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 <4379610c79bd88ddbea10e7f6c21e16d4b338c6b
- Affected versionversion=4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 <445204550f894ca325ac80a21e3df177ad073798
- Affected versionversion=4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 <d903d99ffd22b0180bd745a43f221c21bcdd8d7c
- Affected versionversion=6.17
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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