CVE-2026-68272 (GCVE-0-2026-68272)
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: validate CP_GFX_SHADOW chunk size in CS pass1 Add a minimum-length check for the AMDGPU_CHUNK_ID_CP_GFX_SHADOW chunk in amdgpu_cs_pass1(), matching the gate already present for the IB, FENCE and BO_HANDLES chunk types. The CP_GFX_SHADOW case previously shared a bare break with the dependency and syncobj chunk types, which do not dereference a fixed-size struct. When userspace submits this chunk with length_dw == 0, vmemdup_array_user() is called with size 0 and returns ZERO_SIZE_PTR, which passes the IS_ERR() check. amdgpu_cs_p2_shadow() then dereferences chunk->kdata as a struct drm_amdgpu_cs_chunk_cp_gfx_shadow (reading shadow->flags), faulting on the ZERO_SIZE_PTR and causing a NULL-pointer dereference. This is reachable by an unprivileged process in the render group. Reject undersized chunks with -EINVAL during pass1 so the bad submission is rejected before pass2 ever dereferences the data. (cherry picked from commit 7f61b2eef7415eccdb40850aca0de94211948657)
References
Impacted products
Vendor Product Version
Linux Linux Version: ac9287055ff16a092416c76a19006764e4c6a978
Version: ac9287055ff16a092416c76a19006764e4c6a978
Version: ac9287055ff16a092416c76a19006764e4c6a978
Version: ac9287055ff16a092416c76a19006764e4c6a978
Version: ac9287055ff16a092416c76a19006764e4c6a978
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c"
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          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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                  "versionEndExcluding": "6.12.101",
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                  "vulnerable": true
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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: validate CP_GFX_SHADOW chunk size in CS pass1\n\nAdd a minimum-length check for the AMDGPU_CHUNK_ID_CP_GFX_SHADOW chunk in\namdgpu_cs_pass1(), matching the gate already present for the IB, FENCE and\nBO_HANDLES chunk types.\n\nThe CP_GFX_SHADOW case previously shared a bare break with the dependency\nand syncobj chunk types, which do not dereference a fixed-size struct. When\nuserspace submits this chunk with length_dw == 0, vmemdup_array_user() is\ncalled with size 0 and returns ZERO_SIZE_PTR, which passes the IS_ERR()\ncheck. amdgpu_cs_p2_shadow() then dereferences chunk-\u003ekdata as a struct\ndrm_amdgpu_cs_chunk_cp_gfx_shadow (reading shadow-\u003eflags), faulting on the\nZERO_SIZE_PTR and causing a NULL-pointer dereference.\n\nThis is reachable by an unprivileged process in the render group. Reject\nundersized chunks with -EINVAL during pass1 so the bad submission is\nrejected before pass2 ever dereferences the data.\n\n(cherry picked from commit 7f61b2eef7415eccdb40850aca0de94211948657)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:02:05.775Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3f190956404da55560056ce20606010e18bc059c"
        },
        {
          "url": "https://git.kernel.org/stable/c/2aa9ea2bd5146d237c8cc16d8737d878b0298a94"
        },
        {
          "url": "https://git.kernel.org/stable/c/315d2e5741a81b0be763e80413a2677e22b7e596"
        },
        {
          "url": "https://git.kernel.org/stable/c/24668ca3ec19434d7a9574bf9112f2b0614c3a4e"
        },
        {
          "url": "https://git.kernel.org/stable/c/84c4c36acd5c4b2558b5069f869a165b2c655c84"
        }
      ],
      "title": "drm/amdgpu: validate CP_GFX_SHADOW chunk size in CS pass1",
      "x_generator": {
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      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68272",
    "datePublished": "2026-08-10T12:01:47.708Z",
    "dateReserved": "2026-07-30T09:28:09.378Z",
    "dateUpdated": "2026-08-17T05:02:05.775Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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