138 lines
7.6 KiB
JSON
138 lines
7.6 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-2026-64151",
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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": "2026-07-19T07:54:57.037Z",
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"datePublished": "2026-07-19T15:40:40.643Z",
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"dateUpdated": "2026-08-05T12:39:45.883Z"
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},
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:39:45.883Z"
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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\niommupt: Check for missing PAGE_SIZE in the pgsize_bitmap\n\nSashiko pointed out that the driver could drop PAGE_SIZE from the\npgsize_bitmap. That is technically allowed but nothing does it, and\nsuch an iommu_domain would not be used with the DMA API today.\n\nStill, it is against the design and it is trivial to fix up. Lift\nthe PT_WARN_ON to the if branch and just skip the fast path."
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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:N",
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"baseScore": 8.4,
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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 - The bug is in `map_range()` inside the generic IOMMU page-table path, reached only via local kernel interfaces (`iommu_map()` → `iommu_map_nosync()` → `pt->ops->map_range()`), primarily through `/dev/iommufd` or `/dev/vfio/*` ioctls during device passthrough mapping setup. There is no network-facing entry point.\nAC:L - Once an IOMMU paging domain exists with `PAGE_SIZE` cleared from `pgsize_bitmap`, any `iommu_map()`/`IOMMU_IOAS_MAP` call mapping a single page reliably takes the buggy fast path; the attacker controls mapping requests and needs no races or special memory layout.\nPR:L - Exploitation requires local ability to create IOMMU mappings for a passthrough device (IOMMUFD/VFIO ioctl access and device group permissions), which is available to unprivileged tenants on cloud GPU/NIC passthrough hosts without host root, even though opening `/dev/iommufd` alone is insufficient.\nUI:N - Triggering the flaw is entirely programmatic through IOMMU mapping ioctls; no victim interaction such as mounting a filesystem or opening a file is required.\nS:C - Incorrect leaf PTE installation on an IOMMU domain can break DMA isolation, allowing a device to read/write host physical memory outside its authorized mappings—an IOMMU/DMA security-boundary bypass per kernel CVSS guidance.\nC:H - Malformed or policy-violating IOMMU page-table entries can cause a DMA-capable device to read arbitrary host physical memory beyond the intended IOVA window, constituting arbitrary memory disclosure through the IOMMU bypass primitive.\nI:H - The fast path installs `PAGE_SHIFT` leaf entries even when `PAGE_SIZE` is excluded from `pgsize_bitmap`, corrupting IOMMU translation state and enabling a DMA device to write to unauthorized host physical pages.\nA:N - The flaw corrupts IOMMU translation entries rather than causing a kernel oops, panic, or hang; availability impact is not a primary or reliable outcome of triggering this bug."
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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/generic_pt/iommu_pt.h"
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],
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"versions": [
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{
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"version": "dcd6a011a8d523a114af2360a8753de5bd60c139",
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"lessThan": "00850f41da24423587abd6124a790dd4f12bcef3",
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"status": "affected",
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"lessThan": "8ef3f77c440005c7f04229a75976bfc078364247",
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"status": "affected",
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{
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"product": "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/generic_pt/iommu_pt.h"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "7.0.11",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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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"versionEndExcluding": "7.0.11"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/00850f41da24423587abd6124a790dd4f12bcef3"
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},
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{
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"url": "https://git.kernel.org/stable/c/8ef3f77c440005c7f04229a75976bfc078364247"
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}
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],
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"title": "iommupt: Check for missing PAGE_SIZE in the pgsize_bitmap",
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