CVE-2026-74573iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE
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/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE arm_vsmmu_vsid_to_sid() maps a guest's vSID to a single physical Stream ID taken from master->streams[0], assuming a device has 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. Add an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP when master->num_streams is not one, rather than mapping it silently.
- CVSS
- 9.3 CRITICAL (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/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 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d68beb276ba26cec47350a6d468e967673ee0c56 before 3808bab5d95ae79e333e11f6a73d178e084c645d; from d68beb276ba26cec47350a6d468e967673ee0c56 before 0acbc621341aca4eb94d9c2f43e1ab273ff088f0; from d68beb276ba26cec47350a6d468e967673ee0c56 before c3b8ee84a965058b41275069d4696f37a8b14bf6 | CNA record |
References
- https://git.kernel.org/stable/c/3808bab5d95ae79e333e11f6a73d178e084c645d
- https://git.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0
- https://git.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6
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.