HighFix available

net: dsa: realtek: fix out-of-bounds access

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: net: dsa: realtek: fix out-of-bounds access The probe function sets priv->chip_data to (void *)priv + sizeof(*priv) with the expectation that priv has enough trailing space. However, only realtek-smi actually allocated this chip_data space. Do likewise in realtek-mdio to fix out-of-bounds accesses. These accesses likely went unnoticed so far, because of an (unused) buf[4096] member in struct realtek_priv, which caused kmalloc to round up the allocated buffer to a big enough size, so nothing of value was overwritten. With a different allocator (like in the barebox bootloader port of the driver) or with KASAN, the memory corruption becomes quickly apparent.

Products: Kernel
Affected versions: Not specified
Fixed versions: 6.1.23, 6.2.10
CVEs: CVE-2023-54065
Confirmed fixed CVEs: Not specified
Updated in this feed: 3 Nov 2026, 22:39 UTC · Revision 1

Source evidence

net: dsa: realtek: fix out-of-bounds access

core-osv · Original source

Published 24 Dec 2025, 12:23 UTC

osv:CVE-2023-54065

Kernel

Fixed versions: 6.1.23, 6.2.10

Complete source record

{
  "id": "fbc1206ef8d6bfd8d1e3b0f5591d989827b1c4b5f9eb5bd64fe7768abf29e138",
  "url": "https://osv.dev/vulnerability/CVE-2023-54065",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: dsa: realtek: fix out-of-bounds access",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: dsa: realtek: fix out-of-bounds access The probe function sets priv->chip_data to (void *)priv + sizeof(*priv) with the expectation that priv has enough trailing space. However, only realtek-smi actually allocated this chip_data space. Do likewise in realtek-mdio to fix out-of-bounds accesses. These accesses likely went unnoticed so far, because of an (unused) buf[4096] member in struct realtek_priv, which caused kmalloc to round up the allocated buffer to a big enough size, so nothing of value was overwritten. With a different allocator (like in the barebox bootloader port of the driver) or with KASAN, the memory corruption becomes quickly apparent.",
    "evidence": "osv:CVE-2023-54065",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.23",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.2.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-54065",
      "aliases": [
        "CVE-2023-54065"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "aac94001067da183455d6d37959892744fa01d9d"
                },
                {
                  "fixed": "cc0f9bb99735d2b68fac68f37b585d615728ce5b"
                },
                {
                  "fixed": "fe668aa499b4b95425044ba11af9609db6ecf466"
                },
                {
                  "fixed": "b93eb564869321d0dffaf23fcc5c88112ed62466"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54065.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.18.0"
                },
                {
                  "fixed": "6.1.23"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.2.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54065.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.963484244Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/b93eb564869321d0dffaf23fcc5c88112ed62466",
        "https://git.kernel.org/stable/c/cc0f9bb99735d2b68fac68f37b585d615728ce5b",
        "https://git.kernel.org/stable/c/fe668aa499b4b95425044ba11af9609db6ecf466",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54065.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54065",
        "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/2023/54xxx/CVE-2023-54065.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-54065",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499171,
  "published_at": "2025-12-24T12:23:10.745+00:00"
}