net: ethtool: keep rtnl_lock for the ioctl self test

{
  "id": "29a314d410b6dd8a3317289e729220294799d6104f92fbc3663d3f139c5486d3",
  "url": "https://osv.dev/vulnerability/CVE-2026-98619",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "net: ethtool: keep rtnl_lock for the ioctl self test",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: net: ethtool: keep rtnl_lock for the ioctl self test An offline self test that brings the interface down and back up with netif_close() / netif_open() requires rtnl_lock for both. Since the ethtool IOCTL path became rtnl-optional for ops-locked drivers, the ETHTOOL_TEST ioctl runs holding only the netdev instance lock, so on an ops-locked driver the self test now tears the device down without rtnl_lock. With lockdep this reproduces deterministically on every offline self test on such a driver; note the sole lock held is the instance lock, not rtnl: WARNING: suspicious RCU usage net/core/netpoll.c:207 suspicious rcu_dereference_protected() usage! 1 lock held by ethtool/107: #0: (&dev->lock){+.+.}, at: dev_ethtool Call Trace: netpoll_poll_disable __dev_close_many netif_close_many netif_close fbnic_self_test dev_ethtool_locked dev_ethtool dev_ioctl sock_ioctl __x64_sys_ioctl Without lockdep the same condition trips ASSERT_RTNL() in __dev_close_many() / __dev_open(); that check only samples the global rtnl state, so it can be masked by a concurrent rtnl holder, but the device is still being reconfigured without the lock it requires. The ethtool self_test is a legacy ioctl-only command, so an ETHTOOL_TEST case is only needed on the ioctl path. Add an opt-in bit for drivers whose self test needs rtnl_lock and set it on the ops-locked drivers whose offline self test tears the interface down and up: - fbnic (ops-lock",
    "evidence": "osv:CVE-2026-98619",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98619",
      "aliases": [
        "CVE-2026-98619"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f994752b11273ded7ec6b49ae5c1d319eef21743"
                },
                {
                  "fixed": "4ca1503491f1f25a954c13ac5775bf6775c5abc8"
                },
                {
                  "fixed": "1b82958f3f035df5ccaab5430a2302f08a5d5351"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98619.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.2.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98619.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.582216651Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1b82958f3f035df5ccaab5430a2302f08a5d5351",
        "https://git.kernel.org/stable/c/4ca1503491f1f25a954c13ac5775bf6775c5abc8",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98619.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98619",
        "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/2026/98xxx/CVE-2026-98619.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98619",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493430,
  "published_at": "2026-10-18T15:19:39.448+00:00"
}