net: dsa: avoid suspicious RCU usage for synced VLAN-aware MAC addresses

{
  "id": "e4f9c02d2fdda2f72fb8010b0e98f13306f20617a53fdffa14796a9acb6009cd",
  "url": "https://osv.dev/vulnerability/CVE-2023-54149",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: dsa: avoid suspicious RCU usage for synced VLAN-aware MAC addresses",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: dsa: avoid suspicious RCU usage for synced VLAN-aware MAC addresses When using the felix driver (the only one which supports UC filtering and MC filtering) as a DSA master for a random other DSA switch, one can see the following stack trace when the downstream switch ports join a VLAN-aware bridge: ============================= WARNING: suspicious RCU usage ----------------------------- net/8021q/vlan_core.c:238 suspicious rcu_dereference_protected() usage! stack backtrace: Workqueue: dsa_ordered dsa_slave_switchdev_event_work Call trace: lockdep_rcu_suspicious+0x170/0x210 vlan_for_each+0x8c/0x188 dsa_slave_sync_uc+0x128/0x178 __hw_addr_sync_dev+0x138/0x158 dsa_slave_set_rx_mode+0x58/0x70 __dev_set_rx_mode+0x88/0xa8 dev_uc_add+0x74/0xa0 dsa_port_bridge_host_fdb_add+0xec/0x180 dsa_slave_switchdev_event_work+0x7c/0x1c8 process_one_work+0x290/0x568 What it's saying is that vlan_for_each() expects rtnl_lock() context and it's not getting it, when it's called from the DSA master's ndo_set_rx_mode(). The caller of that - dsa_slave_set_rx_mode() - is the slave DSA interface's dsa_port_bridge_host_fdb_add() which comes from the deferred dsa_slave_switchdev_event_work(). We went to great lengths to avoid the rtnl_lock() context in that call path in commit 0faf890fc519 (\"net: dsa: drop rtnl_lock from dsa_slave_switchdev_event_work\"), and calling rtnl_lock() is simply not an option due to the possibility of deadloc",
    "evidence": "osv:CVE-2023-54149",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.3.13",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-54149",
      "aliases": [
        "CVE-2023-54149"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
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          "ranges": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "64fdc5f341db01200e33105265d4b8450122a82e"
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                  "fixed": "3948c69b3837fec2ee5a90fbc911c343199be0ac"
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                {
                  "fixed": "3f9e79f31e51b7d5bf95c617540deb6cf2816a3f"
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                  "fixed": "d06f925f13976ab82167c93467c70a337a0a3cda"
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                  "fixed": "6.3"
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          "versions": [
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            "v6.2.15",
            "v6.2.14",
            "v6.2.13",
            "v6.2.12",
            "v6.2.11",
            "v6.2.10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54149.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.3.0"
                },
                {
                  "fixed": "6.3.13"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.4.4"
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54149.json"
          }
        }
      ],
      "modified": "2026-10-08T02:48:02.576262349Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3948c69b3837fec2ee5a90fbc911c343199be0ac",
        "https://git.kernel.org/stable/c/3f9e79f31e51b7d5bf95c617540deb6cf2816a3f",
        "https://git.kernel.org/stable/c/d06f925f13976ab82167c93467c70a337a0a3cda",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54149.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54149",
        "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-2023-54149.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-54149",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 98256,
  "published_at": "2025-12-24T13:07:00.977+00:00"
}