CVE-2026-68276 (GCVE-0-2026-68276)
Vulnerability from cvelistv5
Published
2026-08-10 12:01
Modified
2026-08-17 05:02
Severity ?
Summary
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)
References
Impacted products
Vendor Product Version
Linux Linux Version: d361ad5d2fc0e4d59d5d538092c9b37889756642
Version: d361ad5d2fc0e4d59d5d538092c9b37889756642
Version: d361ad5d2fc0e4d59d5d538092c9b37889756642
Version: d361ad5d2fc0e4d59d5d538092c9b37889756642
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c"
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:02:10.194Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/201633f47b542a99bb7baafdfcda7781249fb3d9"
        },
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          "url": "https://git.kernel.org/stable/c/e28420e36542ae8b66a5bdcec419525f521bddf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/9cd9a983769a4d0e9cc80a287316ee79685d38b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/3e864bf2a32a1cbdf1e0f9c5a5a4176e8575f4a3"
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      ],
      "title": "drm/amdgpu/gfx: fix cleaner shader IB buffer overflow",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68276",
    "datePublished": "2026-08-10T12:01:51.789Z",
    "dateReserved": "2026-07-30T09:28:09.379Z",
    "dateUpdated": "2026-08-17T05:02:10.194Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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