CVE-2026-89808 (GCVE-0-2026-89808)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:30 – Updated: 2026-10-30 12:33
VLAI
Title
drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram When migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set + MIGRATE_PFN_VALID unset) driver still allocates device pages. There is no dma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart() will return an uninitialized r. That can trigger out_free_vram_pages to drop all VRAM just set up. Initialize r and only call the last svm_migrate_copy_memory_gart if j > 0. Current code postponed the last page to the final copy. This patch flushes on the last page when reach to the end of current drm_buddy_block; avoids another svm_migrate_copy_memory_gart.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 50ea50cf6f6d31d3235ad1853c5dbea766a3ed11 , < d5872c81c70163a3ba9eb4da9a94c92b03067576 (git)
Affected: 50ea50cf6f6d31d3235ad1853c5dbea766a3ed11 , < 6e1a6f3ddb87d7f89a775c55fb399680c02bdcc2 (git)
Affected: 50ea50cf6f6d31d3235ad1853c5dbea766a3ed11 , < bd1adb2e5101db649121b59e601c92773a302a70 (git)
Affected: 50ea50cf6f6d31d3235ad1853c5dbea766a3ed11 , < ae806a95b28fcecb913430cfa45a252e91a945d6 (git)
Affected: 50ea50cf6f6d31d3235ad1853c5dbea766a3ed11 , < 0a9a0e8a97da70a0336c9115178aaf1be29bcfb1 (git)
Affected: 50ea50cf6f6d31d3235ad1853c5dbea766a3ed11 , < 520e345ffe05aabef1db82beda4288afb1757ff2 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram\n\nWhen migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set +\nMIGRATE_PFN_VALID unset) driver still allocates device pages. There is no\ndma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart()\nwill return an uninitialized r. That can trigger out_free_vram_pages to drop\nall VRAM just set up.\n\nInitialize r and only call the last svm_migrate_copy_memory_gart if j \u003e 0.\n\nCurrent code postponed the last page to the final copy. This patch flushes on\nthe last page when reach to the end of current drm_buddy_block; avoids another\nsvm_migrate_copy_memory_gart."
        }
      ],
      "metrics": [
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            "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 bug is reached only via local /dev/kfd AMDKFD_IOC_SVM (SET_ATTR prefetch) or the process\u0027s own GPU page-fault SVM restore into svm_migrate_copy_to_vram; it is not reachable from network packets, adjacent wireless, or a physical bus.\nAC:L - An attacker creates anonymous VMA holes (untouched mmap or zero pages) and triggers migration with AMDKFD_IOC_SVM PREFETCH_LOC; migrate_vma records MIGRATE_PFN_MIGRATE without VALID so j stays 0 and the uninitialized-r path runs with no race, victim state, or rare config (HSA_AMD_SVM defaults y).\nPR:L - kfd_open() and AMDKFD_IOC_SVM perform no capable() checks (ioctl flag 0, unlike CRIU); /dev/kfd and the DRM render node are available to unprivileged render-group users on typical ROCm, desktop, and Android AMD GPU systems, which is Low privilege not init-namespace root.\nUI:N - Exploitation uses only the attacker\u0027s own /dev/kfd file descriptor, anonymous mappings, and SVM ioctls; no separate victim must mount a filesystem, open a file, or take any other action.\nS:U - Impact is confined to amdkfd SVM/GPUVM state and ZONE_DEVICE pages in the host kernel; it does not cross a VM, hypervisor, IOMMU device-isolation, or sandbox security authority.\nC:H - Spurious out_free_vram_pages unlocks and puts destination ZONE_DEVICE pages (page_free \u2192 svm_range_bo_unref_async) while SDMA may still copy into that VRAM and a non-zero leftover r can still mark the range GPU-resident; that device-page UAF enables kernel/VRAM disclosure.\nI:H - The same premature free of migrate destination pages, while actual_loc/vram_pages may still record a successful GPU migration, lets later HMM/GPUVM/SDMA operate on put ZONE_DEVICE pages and svm_bo refs, a kernel UAF write/control-flow primitive scored High per UAF guidance.\nA:H - Putting still-in-use ZONE_DEVICE pages and leaving SVM actual_loc/vram_pages inconsistent reliably causes kernel oops/WARN (bad page lock, folio_put on freed pages, VRAM BO validation) or GPU hang/reset, which is High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:33:06.729Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/520e345ffe05aabef1db82beda4288afb1757ff2"
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      "title": "drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89808",
    "datePublished": "2026-09-16T10:30:41.508Z",
    "dateReserved": "2026-09-11T19:38:34.767Z",
    "dateUpdated": "2026-10-30T12:33:06.729Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram\n\nWhen migration vm range is hole at cpu side(MIGRATE_PFN_MIGRATE set +\nMIGRATE_PFN_VALID unset) driver still allocates device pages. There is no\ndma map of src pages and migration. j is 0 and svm_migrate_copy_memory_gart()\nwill return an uninitialized r. That can trigger out_free_vram_pages to drop\nall VRAM just set up.\n\nInitialize r and only call the last svm_migrate_copy_memory_gart if j \u003e 0.\n\nCurrent code postponed the last page to the final copy. This patch flushes on\nthe last page when reach to the end of current drm_buddy_block; avoids another\nsvm_migrate_copy_memory_gart."
          }
        ],
        "id": "CVE-2026-89808",
        "lastModified": "2026-10-30T13:20:29.747",
        "metrics": {
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                "attackVector": "LOCAL",
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                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-16T11:16:45.940",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-11-07T10:36:54+00:00",
      "cve": "CVE-2026-89808",
      "id": "CVE-2026-89808",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_affected": "175",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm/amdkfd: Fix the case that vm range is hole at svm_migrate_copy_to_vram",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89808.json",
      "version": "3"
    }
  }
}



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