{"cve":"CVE-2026-31695","nvd":{"published":"2026-05-01T14:16:19.250","modified":"2026-06-17T10:34:15.380","status":"Analyzed","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/20260322075917.254874-1-alex.popov@linux.com/T/#u","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"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"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:33:09.003606135+00:00"},"epss":{"cve":"CVE-2026-31695","score":0.00126,"percentile":0.02232,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}