CVE-2026-93284 (GCVE-0-2026-93284)
Vulnerability from cvelistv5
Published
2026-09-24 16:02
Modified
2026-10-19 09:08
Severity ?
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/pagemap: dma-unmap pages before handling migration errors drm_pagemap_migrate_unmap_pages() relies on the pages array to determine which pages require DMA unmapping. However, drm_pagemap_migration_unlock_put_pages() clears the array as part of its cleanup, leaving drm_pagemap_migrate_unmap_pages() with no valid page information if it is called afterward. Call drm_pagemap_migrate_unmap_pages() before drm_pagemap_migration_unlock_put_pages() so the pages array remains valid during DMA unmapping.
References
Impacted products
Vendor Product Version
Linux Linux Version: f86ad0ed620cb3c91ec7d5468e93ac68d727539d
Version: f86ad0ed620cb3c91ec7d5468e93ac68d727539d
Version: f86ad0ed620cb3c91ec7d5468e93ac68d727539d
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_pagemap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e4331c6644db85bc6ceb470bd84bcf371b6dbfa6",
              "status": "affected",
              "version": "f86ad0ed620cb3c91ec7d5468e93ac68d727539d",
              "versionType": "git"
            },
            {
              "lessThan": "415f5a755cec5164b149037bf294e270b78d36c6",
              "status": "affected",
              "version": "f86ad0ed620cb3c91ec7d5468e93ac68d727539d",
              "versionType": "git"
            },
            {
              "lessThan": "9e6372ec2a3990662ae0a67f56ac0aee19848d5b",
              "status": "affected",
              "version": "f86ad0ed620cb3c91ec7d5468e93ac68d727539d",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/drm_pagemap.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.53",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.9",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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\u0027s anonymous range to VRAM, then do_swap_page() invokes drm_pagemap_migrate_to_ram() -\u003e __drm_pagemap_migrate_to_ram(), or xe_bo_move() calls xe_svm_bo_evict() -\u003e 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()\u0027d dest folios, they force err_finalize by exhausting gt-\u003eusm.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()\u0027d. 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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:08:38.485Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93284",
    "datePublished": "2026-09-24T16:02:08.527Z",
    "dateReserved": "2026-09-17T16:02:15.099Z",
    "dateUpdated": "2026-10-19T09:08:38.485Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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