wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free_CVE-2026-31695

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free\n\nCurrently we execute `SET_NETDEV_DEV(dev, &priv->lowerdev->dev)` for\nthe virt_wifi net devices. However, unregistering a virt_wifi device in\nnetdev_run_todo() can happen together with the device referenced by\nSET_NETDEV_DEV().\n\nIt can result in use-after-free during the ethtool operations performed\non a virt_wifi device that is currently being unregistered. Such a net\ndevice can have the `dev.parent` field pointing to the freed memory,\nbut ethnl_ops_begin() calls `pm_runtime_get_sync(dev->dev.parent)`.\n\nLet's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this:\n\n ==================================================================\n BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0\n Read of size 2 at addr ffff88810cfc46f8 by task pm/606\n\n Call Trace:\n  <TASK>\n  dump_stack_lvl+0x4d/0x70\n  print_report+0x170/0x4f3\n  ? __pfx__raw_spin_lock_irqsave+0x10/0x10\n  kasan_report+0xda/0x110\n  ? __pm_runtime_resume+0xe2/0xf0\n  ? __pm_runtime_resume+0xe2/0xf0\n  __pm_runtime_resume+0xe2/0xf0\n  ethnl_ops_begin+0x49/0x270\n  ethnl_set_features+0x23c/0xab0\n  ? __pfx_ethnl_set_features+0x10/0x10\n  ? kvm_sched_clock_read+0x11/0x20\n  ? local_clock_noinstr+0xf/0xf0\n  ? local_clock+0x10/0x30\n  ? kasan_save_track+0x25/0x60\n  ? __kasan_kmalloc+0x7f/0x90\n  ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0\n  genl_family_rcv_msg_doit+0x1e7/0x2c0\n  ? __pfx_genl_family_rcv_msg_doit+0x10/0x10\n  ? __pfx_cred_has_capability.isra.0+0x10/0x10\n  ? stack_trace_save+0x8e/0xc0\n  genl_rcv_msg+0x411/0x660\n  ? __pfx_genl_rcv_msg+0x10/0x10\n  ? __pfx_ethnl_set_features+0x10/0x10\n  netlink_rcv_skb+0x121/0x380\n  ? __pfx_genl_rcv_msg+0x10/0x10\n  ? __pfx_netlink_rcv_skb+0x10/0x10\n  ? __pfx_down_read+0x10/0x10\n  genl_rcv+0x23/0x30\n  netlink_unicast+0x60f/0x830\n  ? __pfx_netlink_unicast+0x10/0x10\n  ? __pfx___alloc_skb+0x10/0x10\n  netlink_sendmsg+0x6ea/0xbc0\n  ? __pfx_netlink_sendmsg+0x10/0x10\n  ? __futex_queue+0x10b/0x1f0\n  ____sys_sendmsg+0x7a2/0x950\n  ? copy_msghdr_from_user+0x26b/0x430\n  ? __pfx_____sys_sendmsg+0x10/0x10\n  ? __pfx_copy_msghdr_from_user+0x10/0x10\n  ___sys_sendmsg+0xf8/0x180\n  ? __pfx____sys_sendmsg+0x10/0x10\n  ? __pfx_futex_wait+0x10/0x10\n  ? fdget+0x2e4/0x4a0\n  __sys_sendmsg+0x11f/0x1c0\n  ? __pfx___sys_sendmsg+0x10/0x10\n  do_syscall_64+0xe2/0x570\n  ? exc_page_fault+0x66/0xb0\n  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n  </TASK>\n\nThis fix may be combined with another one in the ethtool subsystem:\nhttps://lore.kernel.org/all/[email protected]/T/#u",
    "published": "2026-05-01T13:53:36.857Z",
    "modified": "2026-05-03T05:45:20.976Z",
    "type": "cve",
    "title": "wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/e90f3e74e1ebc26c461a74be490d322716bcdcb4\nhttps://git.kernel.org/stable/c/dcb5915696bd7b32b6404a897c24ee47cb23e772\nhttps://git.kernel.org/stable/c/d1e3aa80e6e04410ba89eaaba4441a0d749d181d\nhttps://git.kernel.org/stable/c/c5fa98842783ed227365d1303785de6a67020c8d\nhttps://git.kernel.org/stable/c/5bbadf60b121065ffb267ec92018607b9c1c7524\nhttps://git.kernel.org/stable/c/5adc01506da94dfaab76f3d1b8410a8ca7bfc59d\nhttps://git.kernel.org/stable/c/789b06f9f39cdc7e895bdab2c034e39c41c8f8d6",
    "id": "CVE-2026-31695",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux d43c65b05b848e0b2db1a6c78b02c189da3a95b5\nLinux Linux 5.15",
    "sourceHref": "",
    "cvss": {
        "score": 7.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "d43c65b05b848e0b2db1a6c78b02c189da3a95b5",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}