GHSA-2F7W-JQWH-GFWP

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-10 15:33
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu/gfx: fix cleaner shader IB buffer overflow

The cleaner shader sysfs path allocates a 16-dword (64 byte) IB but incorrectly fills (align_mask + 1) dwords. On GFX rings align_mask is 0xff, so the loop wrote 256 dwords into a 64-byte buffer, causing a kernel page fault.

The IB only needs to be a minimal NOP shell to schedule the job; the cleaner shader itself is emitted on the ring via emit_cleaner_shader(). Fill 16 dwords to match the allocation.

v2: Use ib_size_dw variable (Lijo)

(cherry picked from commit bf21af331ebf72d0935fd70c73192414a422c03a)

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{
  "affected": [],
  "aliases": [
    "CVE-2026-68276"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu/gfx: fix cleaner shader IB buffer overflow\n\nThe cleaner shader sysfs path allocates a 16-dword (64 byte) IB but\nincorrectly fills (align_mask + 1) dwords. On GFX rings align_mask is\n0xff, so the loop wrote 256 dwords into a 64-byte buffer, causing a\nkernel page fault.\n\nThe IB only needs to be a minimal NOP shell to schedule the job; the\ncleaner shader itself is emitted on the ring via emit_cleaner_shader().\nFill 16 dwords to match the allocation.\n\nv2: Use ib_size_dw variable (Lijo)\n\n(cherry picked from commit bf21af331ebf72d0935fd70c73192414a422c03a)",
  "id": "GHSA-2f7w-jqwh-gfwp",
  "modified": "2026-08-10T15:33:44Z",
  "published": "2026-08-10T15:33:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68276"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/201633f47b542a99bb7baafdfcda7781249fb3d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e864bf2a32a1cbdf1e0f9c5a5a4176e8575f4a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9cd9a983769a4d0e9cc80a287316ee79685d38b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e28420e36542ae8b66a5bdcec419525f521bddf8"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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