CVE-2026-89814

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: clamp the isolation index for rings outside a partition adev->isolation[] has one slot per partition, but a ring that is not assigned to one keeps AMDGPU_XCP_NO_PARTITION, which is ~0, so indexing the array with it is out of bounds. SDMA submissions hit this on both the isolation enforcement and the VM flush path and trip UBSAN. Fall back to the first slot the way the cleaner shader path already does, and stop taking the address before the ring type check that makes it relevant.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-16 11:16:46.610000

Last modified

2026-10-19 09:18:25.200000

View original CVE JSON

{
  "id": "CVE-2026-89814",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-16T11:16:46.610",
  "lastModified": "2026-10-19T09:18:25.200",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: clamp the isolation index for rings outside a partition\n\nadev->isolation[] has one slot per partition, but a ring that is not\nassigned to one keeps AMDGPU_XCP_NO_PARTITION, which is ~0, so indexing\nthe array with it is out of bounds. SDMA submissions hit this on both\nthe isolation enforcement and the VM flush path and trip UBSAN.\n\nFall back to the first slot the way the cleaner shader path already\ndoes, and stop taking the address before the ring type check that makes\nit relevant."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "bd22e44ad415ac22e3a4f9a983d2a085f6cb4427",
              "lessThan": "964de255497ffd7cb8a86e405b8ac6d927e7e177",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "bd22e44ad415ac22e3a4f9a983d2a085f6cb4427",
              "lessThan": "0bfb938182d1313e5cac32ae38dbaaa4eabe4af4",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "bd22e44ad415ac22e3a4f9a983d2a085f6cb4427",
              "lessThan": "b30900566642ceb2c9e12b56c2afec28d0fd91a0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "4277dc1942a8979abe1ef2b55069f42497f885c0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "6.14.9",
              "lessThan": "6.15",
              "versionType": "semver",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c",
            "drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.15",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.15",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.51",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.5",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0bfb938182d1313e5cac32ae38dbaaa4eabe4af4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/964de255497ffd7cb8a86e405b8ac6d927e7e177",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b30900566642ceb2c9e12b56c2afec28d0fd91a0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}