CVE-2026-90425 iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
A Linux kernel IOMMU driver flaw allows out-of-bounds reads when devices lack streams, potentially causing system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-90425?
CVE-2026-90425 is a high-severity vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID
tegra241_vintf_init_vsid() maps a guest vSID to a single physical Stream ID taken from master->streams[0], and only warns when the device does not have exactly one stream. A device with several streams gets only its first one mapped, so a guest vSID invalidation cannot reach the others' ATC and IOTLB entries; a device with none makes master->streams a ZERO_SIZE_PTR, read out of bounds.
Reject the mapping with -EOPNOTSUPP if master->num_streams is not one.
Which versions are affected by CVE-2026-90425?
How do I fix CVE-2026-90425?
Apply the vendor's patch.
Is CVE-2026-90425 being exploited?
There is no known exploitation of CVE-2026-90425 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-90425, DEBIAN-CVE-2026-90425, GHSA-73m7-4m25-pvgh, UBUNTU-CVE-2026-90425.