Riskcovery

CVE-2026-89450

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

State
Published
Severity
8.8 High
Published
Sep 11, 2026
Updated
Oct 19, 2026
Reserved
Sep 11, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.18.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 to before d903d99ffd22b0180bd745a43f221c21bcdd8d7cAffected
  • 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 to before 445204550f894ca325ac80a21e3df177ad073798Affected
  • 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 to before 4379610c79bd88ddbea10e7f6c21e16d4b338c6bAffected
LinuxLinux
  • 6.17Affected
  • before 6.17Not affected
  • 6.18.50 through 6.18.*Not affected
  • 7.2.4 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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