drm/panthor: Flush shmem writes before mapping buffers CPU-uncached

{
  "id": "d1f7117841cd15e3b4e69a4975b1056dfbc5acd880be8b577c56940c4fa4400d",
  "url": "https://osv.dev/vulnerability/CVE-2025-40276",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drm/panthor: Flush shmem writes before mapping buffers CPU-uncached",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drm/panthor: Flush shmem writes before mapping buffers CPU-uncached The shmem layer zeroes out the new pages using cached mappings, and if we don't CPU-flush we might leave dirty cachelines behind, leading to potential data leaks and/or asynchronous buffer corruption when dirty cachelines are evicted.",
    "evidence": "osv:CVE-2025-40276",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.64",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.17.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-40276",
      "aliases": [
        "CVE-2025-40276"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H"
        }
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
                  "fixed": "8355eea2a2e9c323021dfdcb95d7767d382123c4"
                },
                {
                  "fixed": "7a12f9c96d06b145562f76ffb20369b4692f0911"
                },
                {
                  "fixed": "576c930e5e7dcb937648490611a83f1bf0171048"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40276.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.10.0"
                },
                {
                  "fixed": "6.12.64"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.17.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-40276.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.654967532Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/576c930e5e7dcb937648490611a83f1bf0171048",
        "https://git.kernel.org/stable/c/7a12f9c96d06b145562f76ffb20369b4692f0911",
        "https://git.kernel.org/stable/c/8355eea2a2e9c323021dfdcb95d7767d382123c4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40276.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-40276",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/40xxx/CVE-2025-40276.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-40276",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488894,
  "published_at": "2025-12-06T21:50:59.035+00:00"
}