FKIE_CVE-2026-68272

Vulnerability from fkie_nvd - Published: 2026-08-10 13:20 - Updated: 2026-08-17 05:18
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24668ca3ec19434d7a9574bf9112f2b0614c3a4e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2aa9ea2bd5146d237c8cc16d8737d878b0298a94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/315d2e5741a81b0be763e80413a2677e22b7e596
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f190956404da55560056ce20606010e18bc059c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/84c4c36acd5c4b2558b5069f869a165b2c655c84
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3f190956404da55560056ce20606010e18bc059c",
              "status": "affected",
              "version": "ac9287055ff16a092416c76a19006764e4c6a978",
              "versionType": "git"
            },
            {
              "lessThan": "2aa9ea2bd5146d237c8cc16d8737d878b0298a94",
              "status": "affected",
              "version": "ac9287055ff16a092416c76a19006764e4c6a978",
              "versionType": "git"
            },
            {
              "lessThan": "315d2e5741a81b0be763e80413a2677e22b7e596",
              "status": "affected",
              "version": "ac9287055ff16a092416c76a19006764e4c6a978",
              "versionType": "git"
            },
            {
              "lessThan": "24668ca3ec19434d7a9574bf9112f2b0614c3a4e",
              "status": "affected",
              "version": "ac9287055ff16a092416c76a19006764e4c6a978",
              "versionType": "git"
            },
            {
              "lessThan": "84c4c36acd5c4b2558b5069f869a165b2c655c84",
              "status": "affected",
              "version": "ac9287055ff16a092416c76a19006764e4c6a978",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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)"
    }
  ],
  "id": "CVE-2026-68272",
  "lastModified": "2026-08-17T05:18:29.733",
  "metrics": {},
  "published": "2026-08-10T13:20:16.220",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/24668ca3ec19434d7a9574bf9112f2b0614c3a4e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2aa9ea2bd5146d237c8cc16d8737d878b0298a94"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/315d2e5741a81b0be763e80413a2677e22b7e596"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3f190956404da55560056ce20606010e18bc059c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/84c4c36acd5c4b2558b5069f869a165b2c655c84"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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