{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-98518",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-09-25T10:25:14.354Z",
        "datePublished": "2026-10-18T15:17:36.371Z",
        "dateUpdated": "2026-10-24T14:09:15.821Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-10-24T14:09:15.821Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau/dmem: pin VRAM for the whole registered range\n\nCommit c32287471077 (\"gpu/drm/nouveau: enable THP support for GPU memory\nmigration\") grew the device-private region that\nnouveau_dmem_chunk_alloc() registers from DMEM_CHUNK_SIZE to\nDMEM_CHUNK_SIZE * NR_CHUNKS, but left the VRAM buffer object backing that\nregion at DMEM_CHUNK_SIZE.\n\nnouveau_dmem_page_addr() returns chunk->bo->offset plus the page's offset\nwithin the registered region, so every page past the first chunk resolves\nto VRAM outside the buffer object.\n\nSize the buffer object to the region it backs."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - ioctl(DRM_IOCTL_NOUVEAU_SVM_BIND) reaches nouveau_svmm_bind(), nouveau_dmem_migrate_vma(), nouveau_dmem_migrate_chunk(), nouveau_dmem_migrate_copy_one(), nouveau_dmem_page_alloc_locked(), then patched nouveau_dmem_chunk_alloc(); the triggering VMA and request come from a local process.\nAC:H - The path needs CONFIG_DRM_NOUVEAU_SVM, an EXPERIMENTAL default-n option depending on STAGING; nouveau_svm_init() also rejects GPUs newer than Pascal while nouveau_dmem_init() rejects older ones. The attacker cannot create these host build and hardware conditions.\nPR:L - NOUVEAU_SVM_INIT and NOUVEAU_SVM_BIND are registered with DRM_RENDER_ALLOW and neither DRM_ROOT_ONLY nor DRM_AUTH; an ordinary user able to open the Nouveau render node can initialize SVM and migrate their own VMA without capabilities.\nUI:N - The attacking process itself issues SVM_INIT and SVM_BIND and accesses its migrated VMA to trigger migration or readback; no victim must mount, open, or approve anything.\nS:U - nouveau_dmem_page_addr() supplies an invalid LOCAL_FB VRAM address to the same host's Nouveau copy engine and VMM; the code demonstrates a VRAM BO boundary violation, not a VM escape or IOMMU/DMA boundary bypass.\nC:H - nouveau_pfns_map() installs the out-of-BO VRAM PFN in the caller's SVM VMM, and a CPU fault invokes nouveau_dmem_migrate_to_ram() and nouveau_dmem_copy_folio() to copy from that physical VRAM address into a user page, permitting disclosure from overlapping VRAM allocations.\nI:H - nouveau_dmem_migrate_copy_one() passes the out-of-BO paddr to nvc0b5_migrate_copy() as a physical LOCAL_FB destination and sets a writable PFN for writable VMAs, enabling attacker-controlled writes into other VRAM allocations.\nA:H - The unchecked nvc0b5_migrate_copy() physical destination can overwrite active VRAM BOs or fall beyond installed VRAM, faulting or hanging the GPU and denying graphics and compute service to all clients."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/nouveau/nouveau_dmem.c"
                    ],
                    "versions": [
                        {
                            "version": "c3228747107705d47c7e9a03598a434a0380cb73",
                            "lessThan": "06c69c64686a31783c8bec6495dc22822d38c4ce",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "c3228747107705d47c7e9a03598a434a0380cb73",
                            "lessThan": "64ca4cdd1031206424e6455f0ae4fb0560d8f46a",
                            "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/gpu/drm/nouveau/nouveau_dmem.c"
                    ],
                    "versions": [
                        {
                            "version": "6.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.9",
                            "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": "6.19",
                                    "versionEndExcluding": "7.2.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.19",
                                    "versionEndExcluding": "7.3"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/06c69c64686a31783c8bec6495dc22822d38c4ce"
                },
                {
                    "url": "https://git.kernel.org/stable/c/64ca4cdd1031206424e6455f0ae4fb0560d8f46a"
                }
            ],
            "title": "drm/nouveau/dmem: pin VRAM for the whole registered range",
            "x_generator": {
                "engine": "bippy-1.2.0"
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    }
}