{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93284", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T16:02:15.099Z", "datePublished": "2026-09-24T16:02:08.527Z", "dateUpdated": "2026-10-19T09:08:38.485Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:08:38.485Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/pagemap: dma-unmap pages before handling migration errors\n\ndrm_pagemap_migrate_unmap_pages() relies on the pages array to determine\nwhich pages require DMA unmapping. However,\ndrm_pagemap_migration_unlock_put_pages() clears the array as part of its\ncleanup, leaving drm_pagemap_migrate_unmap_pages() with no valid page\ninformation if it is called afterward.\n\nCall drm_pagemap_migrate_unmap_pages() before\ndrm_pagemap_migration_unlock_put_pages() so the pages array remains\nvalid during DMA unmapping." } ], "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 - Local ioctl/fault path only: DRM_IOCTL_XE_VM_CREATE (FAULT_MODE) and DRM_IOCTL_XE_VM_BIND (CPU_ADDR_MIRROR) on /dev/dri/renderD* migrate the caller's anonymous range to VRAM, then do_swap_page() invokes drm_pagemap_migrate_to_ram() -> __drm_pagemap_migrate_to_ram(), or xe_bo_move() calls xe_svm_bo_evict() -> drm_pagemap_evict_to_ram(). No remote protocol byte reaches those functions.\nAC:L - The attacker creates the SVM range, migrates it to VRAM, and CPU-faults or TTM-evicts it. After drm_pagemap_migrate_map_system_pages() has dma_map_page()'d dest folios, they force err_finalize by exhausting gt->usm.bb_pool so xe_svm_copy_to_ram()/xe_bb_new() returns -ENOMEM, or by fragmenting IOVA so dma_iova_try_alloc() fails and a later dma_map_page() returns -EFAULT. No victim timing.\nPR:L - DRM_IOCTL_XE_VM_CREATE and DRM_IOCTL_XE_VM_BIND are DRM_RENDER_ALLOW; xe_vm_create_ioctl() performs no capable() or DRM-master check. An unprivileged local user with typical render/video-group access to /dev/dri/renderD* on an Intel Xe discrete GPU (CONFIG_DRM_XE_PAGEMAP defaults to y) can create a fault-mode VM and reach the patched functions.\nUI:N - The attacking process opens the render node, creates its own fault-mode VM, CPU_ADDR_MIRROR-binds its anonymous mapping, prefetches or GPU-faults it into VRAM, then CPU-accesses or forces TTM eviction. No other user must mount a filesystem or open a file.\nS:C - On err_finalize, drm_pagemap_migration_unlock_put_pages() folio_put()s the destination RAM folios and zeros migrate_pfn, so drm_pagemap_migrate_unmap_pages() sees a NULL page and skips dma_unmap_page(). Those IOMMU PTEs remain aimed at pages already returned to the buddy allocator, which is an IOMMU/DMA isolation bypass.\nC:H - Destination folios from drm_pagemap_migrate_populate_ram_pfn() are put while still dma_map_page()'d. Recycled host pages stay IOMMU-reachable through the leaked translation, so later DMA can disclose their new kernel or cross-process contents rather than a bounded pointer leak.\nI:H - The leaked mappings are DMA_FROM_DEVICE (Xe copy-from-VRAM via xe_svm_copy_to_ram()). After folio_put(), a GPU/IOMMU transaction through those IOVAs writes into whatever reused the physical pages, an arbitrary physical write through the IOMMU rather than a bounded corruption.\nA:H - Each failed __drm_pagemap_migrate_to_ram()/drm_pagemap_evict_to_ram() leaks that range's dma_map_page() IOVAs; the attacker loops CPU faults after inducing xe_bb_new() or map errors. Unbounded IOVA growth wedges later maps, and DMA into buddy-reused pages oopses or panics, not a mere slowdown." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/drm_pagemap.c" ], "versions": [ { "version": "f86ad0ed620cb3c91ec7d5468e93ac68d727539d", "lessThan": "e4331c6644db85bc6ceb470bd84bcf371b6dbfa6", "status": "affected", "versionType": "git" }, { "version": "f86ad0ed620cb3c91ec7d5468e93ac68d727539d", "lessThan": "415f5a755cec5164b149037bf294e270b78d36c6", "status": "affected", "versionType": "git" }, { "version": "f86ad0ed620cb3c91ec7d5468e93ac68d727539d", "lessThan": "9e6372ec2a3990662ae0a67f56ac0aee19848d5b", "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/drm_pagemap.c" ], "versions": [ { "version": "6.17", "status": "affected" }, { "version": "0", "lessThan": "6.17", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.53", "lessThanOrEqual": "6.18.*", "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": "6.17", "versionEndExcluding": "6.18.53" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e4331c6644db85bc6ceb470bd84bcf371b6dbfa6" }, { "url": "https://git.kernel.org/stable/c/415f5a755cec5164b149037bf294e270b78d36c6" }, { "url": "https://git.kernel.org/stable/c/9e6372ec2a3990662ae0a67f56ac0aee19848d5b" } ], "title": "drm/pagemap: dma-unmap pages before handling migration errors", "x_generator": { "engine": "bippy-1.2.0" } } } }