vxlan: Annotate FDB data races

{
  "id": "6f5c2c65be7f1847a8498c8fff80d59ee208f3cb55c9993c8a541fb4ff504c97",
  "url": "https://osv.dev/vulnerability/CVE-2025-38037",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "vxlan: Annotate FDB data races",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: vxlan: Annotate FDB data races The 'used' and 'updated' fields in the FDB entry structure can be accessed concurrently by multiple threads, leading to reports such as [1]. Can be reproduced using [2]. Suppress these reports by annotating these accesses using READ_ONCE() / WRITE_ONCE(). [1] BUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit write to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0: vxlan_xmit+0xb29/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2: vxlan_xmit+0xadf/0x2380 dev_hard_start_xmit+0x84/0x2f0 __dev_queue_xmit+0x45a/0x1650 packet_xmit+0x100/0x150 packet_sendmsg+0x2114/0x2ac0 __sys_sendto+0x318/0x330 __x64_sys_sendto+0x76/0x90 x64_sys_call+0x14e8/0x1c00 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0x00000000fffbac6e -> 0x00000000fffbac6f Reported by Kernel Concurrency Sanitizer on: CPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 [2] #!/bin/bash set +H echo whitelist > /sys/kernel/debug/kcsan echo !vxlan_xmit > /sys/kernel/debug/kcsan ip link add name vx0 up typ",
    "evidence": "osv:CVE-2025-38037",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.4.294",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.238",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.185",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.141",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.31",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38037",
      "aliases": [
        "CVE-2025-38037"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "d342894c5d2f8c7df194c793ec4059656e09ca31"
                },
                {
                  "fixed": "02a33b1035a307453a1da6ce0a1bf3676be287d7"
                },
                {
                  "fixed": "87d076987a9ba106c83412fcd113656f71af05a1"
                },
                {
                  "fixed": "e033da39fc6abbddab6c29624acef80757f273fa"
                },
                {
                  "fixed": "784b78295a3a58bf052339dd669e6e03710220d3"
                },
                {
                  "fixed": "13cba3f837903f7184d6e9b6137d5165ffe82a8f"
                },
                {
                  "fixed": "a6644aeb8ddf196dec5f8e782293c36f065df4d7"
                },
                {
                  "fixed": "4eceb7eae6ea7c950384c34e6dbbe872c981935f"
                },
                {
                  "fixed": "f6205f8215f12a96518ac9469ff76294ae7bd612"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38037.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "3.7.0"
                },
                {
                  "fixed": "5.4.294"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.238"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.185"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.141"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.93"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.31"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.14.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38037.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.275143894Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02a33b1035a307453a1da6ce0a1bf3676be287d7",
        "https://git.kernel.org/stable/c/13cba3f837903f7184d6e9b6137d5165ffe82a8f",
        "https://git.kernel.org/stable/c/4eceb7eae6ea7c950384c34e6dbbe872c981935f",
        "https://git.kernel.org/stable/c/784b78295a3a58bf052339dd669e6e03710220d3",
        "https://git.kernel.org/stable/c/87d076987a9ba106c83412fcd113656f71af05a1",
        "https://git.kernel.org/stable/c/a6644aeb8ddf196dec5f8e782293c36f065df4d7",
        "https://git.kernel.org/stable/c/e033da39fc6abbddab6c29624acef80757f273fa",
        "https://git.kernel.org/stable/c/f6205f8215f12a96518ac9469ff76294ae7bd612",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38037.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38037",
        "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-2025-38037.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38037",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503129,
  "published_at": "2025-06-18T09:33:23.551+00:00"
}