drm/amdgpu: disallow multiple FENCE chunks in one submit

{
  "id": "942524a9456c263af152df4598d47ac6aed35fbf577bf165e9c418b8ab5d35a6",
  "url": "https://osv.dev/vulnerability/CVE-2026-80539",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/amdgpu: disallow multiple FENCE chunks in one submit",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: disallow multiple FENCE chunks in one submit amdgpu_cs_pass1() dispatches on chunk_id once per chunk without rejecting repeated ids. p->uf_bo is a single-slot field, so a submission carrying two AMDGPU_CHUNK_ID_FENCE chunks runs amdgpu_cs_p1_user_fence() twice, and the second run overwrites p->uf_bo with a freshly referenced BO without dropping the reference taken by the first. amdgpu_cs_parser_fini() only unrefs the final p->uf_bo, so every FENCE chunk but the last leaks a BO reference. The leaked BO outlives handle close and process exit. Reject duplicate FENCE chunks the same way commit fec5f8e8c6bc (\"drm/amdgpu: disallow multiple BO_HANDLES chunks in one submit\") did for p->bo_list. (cherry picked from commit 665b1fc2a1845206408f9a2c6da67101789edb82)",
    "evidence": "osv:CVE-2026-80539",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.1.185",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.153",
            "evidence": "/affected/1/ranges"
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            "value": "6.12.105",
            "evidence": "/affected/1/ranges"
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            "value": "6.18.46",
            "evidence": "/affected/1/ranges"
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          {
            "value": "7.1.10",
            "evidence": "/affected/1/ranges"
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        "affected_versions": []
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-80539",
      "aliases": [
        "CVE-2026-80539"
      ],
      "affected": [
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:36.595459817Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/070229262ede37d17c4ea596650deb6e5eb5d106",
        "https://git.kernel.org/stable/c/5f46322e0b84af29e10eb951ff45bd6ea40640de",
        "https://git.kernel.org/stable/c/71aa45f7bfe46fbc6f51e7832573ff49b6005fea",
        "https://git.kernel.org/stable/c/7e9954e7212042ec808b06181b365b14f00c6f0a",
        "https://git.kernel.org/stable/c/931cd1d1baeae68e8eb2c23bc1f3d8934dca6241",
        "https://git.kernel.org/stable/c/e3ee74d6dbbe409eb99546a7b0a02b2782f9021d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80539.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80539",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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      "provider_metadata": {
        "cna_assigner": "Linux",
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    "related_cves": [
      {
        "value": "CVE-2026-80539",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503951,
  "published_at": "2026-08-26T14:37:13.367+00:00"
}