GHSA-5JG9-2PJG-5862

Vulnerability from github – Published: 2026-08-27 15:31 – Updated: 2026-08-27 15:31
VLAI
Details

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)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80539"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-26T15:17:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: disallow multiple FENCE chunks in one submit\n\namdgpu_cs_pass1() dispatches on chunk_id once per chunk without\nrejecting repeated ids. p-\u003euf_bo is a single-slot field, so a\nsubmission carrying two AMDGPU_CHUNK_ID_FENCE chunks runs\namdgpu_cs_p1_user_fence() twice, and the second run overwrites\np-\u003euf_bo with a freshly referenced BO without dropping the reference\ntaken by the first.\n\namdgpu_cs_parser_fini() only unrefs the final p-\u003euf_bo, so every FENCE\nchunk but the last leaks a BO reference. The leaked BO outlives handle\nclose and process exit.\n\nReject duplicate FENCE chunks the same way commit fec5f8e8c6bc\n(\"drm/amdgpu: disallow multiple BO_HANDLES chunks in one submit\") did\nfor p-\u003ebo_list.\n\n(cherry picked from commit 665b1fc2a1845206408f9a2c6da67101789edb82)",
  "id": "GHSA-5jg9-2pjg-5862",
  "modified": "2026-08-27T15:31:32Z",
  "published": "2026-08-27T15:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80539"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/070229262ede37d17c4ea596650deb6e5eb5d106"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5f46322e0b84af29e10eb951ff45bd6ea40640de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/71aa45f7bfe46fbc6f51e7832573ff49b6005fea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e9954e7212042ec808b06181b365b14f00c6f0a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/931cd1d1baeae68e8eb2c23bc1f3d8934dca6241"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3ee74d6dbbe409eb99546a7b0a02b2782f9021d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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