CVE-2026-89450iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before d903d99ffd22b0180bd745a43f221c21bcdd8d7c; from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before 445204550f894ca325ac80a21e3df177ad073798; from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before 4379610c79bd88ddbea10e7f6c21e16d4b338c6b | CNA record |
References
- https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c
- https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798
- https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.