159 lines
9.1 KiB
JSON
159 lines
9.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90425",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.814Z",
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"datePublished": "2026-09-17T16:09:47.810Z",
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"dateUpdated": "2026-10-19T09:03:29.009Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:03:29.009Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"
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],
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"versions": [
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{
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"version": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7",
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"lessThan": "9b37afb2d34d99ec4f8db28134181b5a8ec9a4a5",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7",
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"lessThan": "0b139ec4641c7d4163d8e345c26cc630e24fa43b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7",
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"lessThan": "fb292bfc9be936dade7eef7ec5762de1201983d8",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"
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],
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"versions": [
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{
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"version": "6.17",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.17",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.52",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "6.18.52"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.17",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/9b37afb2d34d99ec4f8db28134181b5a8ec9a4a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/0b139ec4641c7d4163d8e345c26cc630e24fa43b"
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},
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{
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"url": "https://git.kernel.org/stable/c/fb292bfc9be936dade7eef7ec5762de1201983d8"
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}
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],
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"title": "iommu/tegra241-cmdqv: Require exactly one Stream ID for a vSID",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |