by Kastro
Paper/Archive/CVE-2026-74573

CVE-2026-74573

Linux Linux — iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
30
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 9.1.091 × 201.8No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Linuxd68beb276ba26cec47350a6d468e967673ee0c56 – < 3808bab5d95ae79e333e11f6a73d178e084c645d3808bab5d95ae79e333e11f6a73d178e084c645dCNA
Linuxd68beb276ba26cec47350a6d468e967673ee0c56 – < 0acbc621341aca4eb94d9c2f43e1ab273ff088f00acbc621341aca4eb94d9c2f43e1ab273ff088f0CNA
Linuxd68beb276ba26cec47350a6d468e967673ee0c56 – < c3b8ee84a965058b41275069d4696f37a8b14bf6c3b8ee84a965058b41275069d4696f37a8b14bf6CNA
Linux6.136.18.44CNA

Scores by source

Linux (CNA)9.3CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgit.kernel.org/stable/c/3808bab5d95ae79e333e11f6a73d178e084c645drefgit.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0refgit.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6