{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90425", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.814Z", "datePublished": "2026-09-17T16:09:47.810Z", "dateUpdated": "2026-10-19T09:03:29.009Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:03:29.009Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID\n\ntegra241_vintf_init_vsid() maps a guest vSID to a single physical Stream ID\ntaken from master->streams[0], and only warns when the device does not have\nexactly one stream. A device with several streams gets only its first one\nmapped, so a guest vSID invalidation cannot reach the others' ATC and IOTLB\nentries; a device with none makes master->streams a ZERO_SIZE_PTR, read out\nof bounds.\n\nReject the mapping with -EOPNOTSUPP if master->num_streams is not one." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - tegra241_vintf_init_vsid() is reached only via iommufd_fops_ioctl() dispatching IOMMU_VDEVICE_ALLOC to iommufd_vdevice_alloc_ioctl() after VFIO_DEVICE_BIND_IOMMUFD. master->num_streams comes from the bound device's IORT/DT fwspec, not from a network protocol message.\nAC:L - Once a CMDQV master is bound, IOMMU_VDEVICE_ALLOC always does writel(master->streams[0].id, SID_REPLACE). pci_for_each_dma_alias (iort_pci_iommu_init) yields num_streams>1 and maps only the first SID; num_streams==0 reads ZERO_SIZE_PTR. The attacker issues that ioctl; no race or uninfluenced layout is required.\nPR:L - iommufd_fops_open() and iommufd_vdevice_alloc_ioctl() have no capable() check (/dev/iommu 0660). A tenant or unprivileged QEMU user granted VFIO access on NVIDIA Grace can VFIO_DEVICE_BIND_IOMMUFD, IOMMU_VIOMMU_ALLOC type TEGRA241_CMDQV, and IOMMU_VDEVICE_ALLOC without init-namespace root.\nUI:N - The attacker opens iommufd, binds the assigned device, allocates the TEGRA241_CMDQV vIOMMU and vDEVICE, then issues guest ATC_INV on the mmap'd VCMDQ themselves. No separate victim action such as mounting a filesystem is required.\nS:C - tegra241_vintf_init_vsid() programs SID_REPLACE/SID_MATCH only for master->streams[0], so CMDQV HW rewrite of guest ATC_INV (no VMEXIT) and arm_vsmmu_cache_invalidate cannot reach the other streams' ATC/IOTLB. That is an IOMMU/DMA boundary bypass: stale translations let device DMA reach host memory outside the guest domain.\nC:H - After a guest IOVA unmap, stale ATC/IOTLB entries on the unprogrammed physical SIDs let the passthrough device DMA-read recycled host pages. That is an arbitrary host-memory disclosure through the IOMMU, not a bounded kernel-pointer leak.\nI:H - The same stale translations allow DMA writes into recycled host pages, and programming only one of several SIDs leaves ATC_INV operating on the wrong Stream ID, corrupting IOMMU translation state with an arbitrary write suitable for control-flow hijack.\nA:H - When fwspec->num_ids is 0, arm_smmu_insert_master() sets master->streams to ZERO_SIZE_PTR ((void *)16) and tegra241_vintf_init_vsid() dereferences streams[0].id, which slab.h documents as a distinct access fault/oops; missed invalidations also let hostile DMA panic the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c" ], "versions": [ { "version": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7", "lessThan": "9b37afb2d34d99ec4f8db28134181b5a8ec9a4a5", "status": "affected", "versionType": "git" }, { "version": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7", "lessThan": "0b139ec4641c7d4163d8e345c26cc630e24fa43b", "status": "affected", "versionType": "git" }, { "version": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7", "lessThan": "fb292bfc9be936dade7eef7ec5762de1201983d8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9b37afb2d34d99ec4f8db28134181b5a8ec9a4a5" }, { "url": "https://git.kernel.org/stable/c/0b139ec4641c7d4163d8e345c26cc630e24fa43b" }, { "url": "https://git.kernel.org/stable/c/fb292bfc9be936dade7eef7ec5762de1201983d8" } ], "title": "iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID", "x_generator": { "engine": "bippy-1.2.0" } } } }