138 lines
7.8 KiB
JSON
138 lines
7.8 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-2026-98518",
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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": "2026-09-25T10:25:14.354Z",
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"datePublished": "2026-10-18T15:17:36.371Z",
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"dateUpdated": "2026-10-24T14:09:15.821Z"
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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": "2026-10-24T14:09:15.821Z"
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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\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."
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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:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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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 - 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."
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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/gpu/drm/nouveau/nouveau_dmem.c"
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],
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"versions": [
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{
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"version": "c3228747107705d47c7e9a03598a434a0380cb73",
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"lessThan": "06c69c64686a31783c8bec6495dc22822d38c4ce",
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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": "c3228747107705d47c7e9a03598a434a0380cb73",
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"lessThan": "64ca4cdd1031206424e6455f0ae4fb0560d8f46a",
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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/gpu/drm/nouveau/nouveau_dmem.c"
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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": "7.2.9",
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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": "6.19",
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"versionEndExcluding": "7.2.9"
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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": "6.19",
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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/06c69c64686a31783c8bec6495dc22822d38c4ce"
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},
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{
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"url": "https://git.kernel.org/stable/c/64ca4cdd1031206424e6455f0ae4fb0560d8f46a"
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}
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],
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"title": "drm/nouveau/dmem: pin VRAM for the whole registered range",
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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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} |