{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/migrate_device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "99186b185c245f5987d7f8715d5504c8d8cc04a0",
              "status": "affected",
              "version": "a30b48bf1b244f11bf9b6d20cdccfe0c2264130c",
              "versionType": "git"
            },
            {
              "lessThan": "dc41e961a269f2ca4196e669d6d8e05480899cd4",
              "status": "affected",
              "version": "a30b48bf1b244f11bf9b6d20cdccfe0c2264130c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/migrate_device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc2",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/migrate_device: avoid out-of-bounds writes for compound folios\n\nmigrate_device_range() and migrate_device_pfns() clear the entries\nfollowing a compound folio so that the PFN arrays retain their\npage-granular representation.\n\nIf a compound folio extends beyond the end of the caller-provided range,\nthe loops clear all following folio entries without limiting them to the\nnumber of slots remaining in the npages-sized array, causing an\nout-of-bounds write.\n\nDo not proceed with a compound folio if its page-granular representation\ndoes not fit entirely in the remaining PFN array.  If this happens, drop\nany reference and lock acquired for the folio, clear the remaining\nentries, and stop collecting.\n\nObserved with a KASAN x86 QEMU kernel using the HMM migrate_anon_huge_zero\nselftest.  Closing /dev/hmm_dmirror0 after migrating an anonymous huge\npage to device memory exercises:\n\n  dmirror_fops_release()\n    -\u003e dmirror_device_evict_chunk()\n      -\u003e migrate_device_range()"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The OOB write is in migrate_device_range()/migrate_device_pfns() on the device-private eviction path, reached from local HMM/GPU SVM (close of /dev/hmm_dmirror*, Nouveau dmem teardown, Intel Xe drm_pagemap_evict_to_ram after DRM_XE_VM_BIND), not from received network packets.\nAC:L - The attacker creates a compound device folio by migrating an anonymous THP or huge-zero page, then triggers eviction of a too-small PFN array (dmirror close/HMM_DMIRROR_RELEASE or Xe TTM eviction of a CPU_ADDR_MIRROR BO). The HMM selftest hits this deterministically; no victim timing is required.\nPR:L - Intel Xe DRM_XE_VM_BIND is DRM_RENDER_ALLOW with no capable() or DRM-master check. An unprivileged local user with typical render/video-group access to /dev/dri/renderD* can migrate a THP to device memory and force drm_pagemap_evict_to_ram.\nUI:N - The attacker performs mmap/madvise, the migrate ioctl, and eviction or close entirely in their own process. No other user or administrator needs to mount a filesystem, open a file, or otherwise interact.\nS:U - The overflow corrupts host-kernel memory adjacent to the caller-provided src_pfns kvcalloc/kvmalloc array. That is standard local privilege escalation in the same security authority, not a KVM/Xen guest-to-host escape or IOMMU/DMA bypass.\nC:H - migrate_device_* zeros every tail slot of a compound folio without clipping to npages, overflowing the PFN array by up to (folio_nr_pages-remaining) pointers (~4KB for a 2MB THP). That heap corruption can be turned into an arbitrary kernel read via overlapping objects.\nI:H - The same unbounded store is an out-of-bounds kernel write into adjacent slab/vmalloc objects. Zeroing neighboring heap metadata, pointers, or function pointers is exploitable for an arbitrary write and control-flow hijack, not a bounded integrity change.\nA:H - KASAN reports this overflow on the HMM migrate_anon_huge_zero selftest when closing /dev/hmm_dmirror0, and smashing adjacent kernel objects with zeros causes an oops or panic even without a completed exploit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T14:40:44.952Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/99186b185c245f5987d7f8715d5504c8d8cc04a0"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc41e961a269f2ca4196e669d6d8e05480899cd4"
        }
      ],
      "title": "mm/migrate_device: avoid out-of-bounds writes for compound folios",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89967",
    "datePublished": "2026-09-16T10:32:48.164Z",
    "dateReserved": "2026-09-11T19:38:34.778Z",
    "dateUpdated": "2026-09-16T14:40:44.952Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}