wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free

{
  "id": "14fe0e90f54c983da6ba7156fdff361e6f2b3df496826b88a484dedf2d31db2a",
  "url": "https://osv.dev/vulnerability/CVE-2026-31695",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free Currently we execute `SET_NETDEV_DEV(dev, &priv->lowerdev->dev)` for the virt_wifi net devices. However, unregistering a virt_wifi device in netdev_run_todo() can happen together with the device referenced by SET_NETDEV_DEV(). It can result in use-after-free during the ethtool operations performed on a virt_wifi device that is currently being unregistered. Such a net device can have the `dev.parent` field pointing to the freed memory, but ethnl_ops_begin() calls `pm_runtime_get_sync(dev->dev.parent)`. Let's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this: ================================================================== BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0 Read of size 2 at addr ffff88810cfc46f8 by task pm/606 Call Trace: dump_stack_lvl+0x4d/0x70 print_report+0x170/0x4f3 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 kasan_report+0xda/0x110 ? __pm_runtime_resume+0xe2/0xf0 ? __pm_runtime_resume+0xe2/0xf0 __pm_runtime_resume+0xe2/0xf0 ethnl_ops_begin+0x49/0x270 ethnl_set_features+0x23c/0xab0 ? __pfx_ethnl_set_features+0x10/0x10 ? kvm_sched_clock_read+0x11/0x20 ? local_clock_noinstr+0xf/0xf0 ? local_clock+0x10/0x30 ? kasan_save_track+0x25/0x60 ? __kasan_kmalloc+0x7f/0x90 ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0 genl_family_rcv_msg_doit+0x1e7/0x2c0 ? __pfx_genl_family_rcv_msg_doit+0x10/0x10 ? __pfx_cred_h",
    "evidence": "osv:CVE-2026-31695",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.203",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.168",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.134",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.81",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.22",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-31695",
      "aliases": [
        "CVE-2026-31695"
      ],
      "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": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "fixed": "e90f3e74e1ebc26c461a74be490d322716bcdcb4"
                },
                {
                  "fixed": "dcb5915696bd7b32b6404a897c24ee47cb23e772"
                },
                {
                  "fixed": "d1e3aa80e6e04410ba89eaaba4441a0d749d181d"
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                {
                  "fixed": "c5fa98842783ed227365d1303785de6a67020c8d"
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                {
                  "fixed": "5bbadf60b121065ffb267ec92018607b9c1c7524"
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                {
                  "fixed": "5adc01506da94dfaab76f3d1b8410a8ca7bfc59d"
                },
                {
                  "fixed": "789b06f9f39cdc7e895bdab2c034e39c41c8f8d6"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31695.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
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                {
                  "fixed": "5.15.203"
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            },
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.2.0"
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            {
              "type": "ECOSYSTEM",
              "events": [
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            },
            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                {
                  "fixed": "6.18.22"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31695.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:53.174111051Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5adc01506da94dfaab76f3d1b8410a8ca7bfc59d",
        "https://git.kernel.org/stable/c/5bbadf60b121065ffb267ec92018607b9c1c7524",
        "https://git.kernel.org/stable/c/789b06f9f39cdc7e895bdab2c034e39c41c8f8d6",
        "https://git.kernel.org/stable/c/c5fa98842783ed227365d1303785de6a67020c8d",
        "https://git.kernel.org/stable/c/d1e3aa80e6e04410ba89eaaba4441a0d749d181d",
        "https://git.kernel.org/stable/c/dcb5915696bd7b32b6404a897c24ee47cb23e772",
        "https://git.kernel.org/stable/c/e90f3e74e1ebc26c461a74be490d322716bcdcb4",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31695.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-31695",
        "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/2026/31xxx/CVE-2026-31695.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-31695",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 522010,
  "published_at": "2026-05-01T13:53:36.857+00:00"
}