mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write

{
  "id": "648f5dbc6648c1bf4b806a6a189ab968cfa6ee6f5d31ced34485557707172654",
  "url": "https://osv.dev/vulnerability/CVE-2025-38258",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write memcg_path_store() assigns a newly allocated memory buffer to filter->memcg_path, without deallocating the previously allocated and assigned memory buffer. As a result, users can leak kernel memory by continuously writing a data to memcg_path DAMOS sysfs file. Fix the leak by deallocating the previously set memory buffer.",
    "evidence": "osv:CVE-2025-38258",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38258",
      "aliases": [
        "CVE-2025-38258"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7ee161f18b5da5170b5d6a51aace49d312099128"
                },
                {
                  "fixed": "490a43d07f1663d827e802720d30cbc0494e4f81"
                },
                {
                  "fixed": "c5d5b0047b0c0f304608f3824139f7bd34c48413"
                },
                {
                  "fixed": "4a158ac0538dd5695eeaa00aa0720d711f3e4ef1"
                },
                {
                  "fixed": "4f489fe6afb395dbc79840efa3c05440b760d883"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38258.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.6.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38258.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.609422768Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/490a43d07f1663d827e802720d30cbc0494e4f81",
        "https://git.kernel.org/stable/c/4a158ac0538dd5695eeaa00aa0720d711f3e4ef1",
        "https://git.kernel.org/stable/c/4f489fe6afb395dbc79840efa3c05440b760d883",
        "https://git.kernel.org/stable/c/c5d5b0047b0c0f304608f3824139f7bd34c48413",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38258.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38258",
        "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/2025/38xxx/CVE-2025-38258.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38258",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493187,
  "published_at": "2025-07-09T10:42:35+00:00"
}