{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98331",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98331"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "wifi: mac80211: unlist vifs when their netdev is unregistered",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: unlist vifs when their netdev is unregistered\n\nmac80211 only removes vifs from the local->interfaces list when\nan interface is removed via ieee80211_if_remove(), before it\nunregisters the netdev. However, it's possible for a netdev to\nbe unregistered without going through that: When the netns that\nholds the wiphy is destroyed, the wiphy is supposed to move to\nthe init_ns, but that can run into allocation failures.\n\nThen, mac80211 has an interface listed that doesn't exist, and\nwill eventually hit\n\n  BUG: failure at net/wireless/core.h:141/wiphy_to_rdev()!\n  ...\n  _cfg80211_unregister_wdev+0x24/0x36a [cfg80211]\n  cfg80211_unregister_wdev+0x15/0x1d [cfg80211]\n  ieee80211_remove_interfaces+0x1ff/0x257 [mac80211]\n  ieee80211_unregister_hw+0x73/0x1d1 [mac80211]\n  mac80211_hwsim_del_radio+0x114/0x166 [mac80211_hwsim]\n\nRemove the interface from the list in ->ndo_uninit if it's still\naround to avoid this.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-98331"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a22c02863439993095acd0c3db97fa53cd515f4f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/20a56e96a6f7b4dfbd13f8732fd2673409fc7ba0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b735ad1a9aca6080192c1316cf2706e5e1318762"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/d45bf731ec7085d2cc2c5d179d3b3b6c743d4fb1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/821bab0456dfca12acef6df702c8f2477d313227"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/eee2efd82867b623982ac51925b5a1812a74c50d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.0,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The trigger is local: tearing down a netns that holds a mac80211 wiphy runs cfg80211_pernet_exit()->cfg80211_switch_netns(). When dev_change_net_namespace() fails there, default_device_exit_batch() unregisters the netdev while ieee80211_uninit() leaves its sdata on local->interfaces. No WiFi frame supplies the failing state.\nAC:H - It needs a wiphy already moved into an attacker-controlled netns (an admin step), plus a failed move back. The attacker can force the failure: an altname on the wlan netdev that clashes with an init_net name makes __dev_change_net_namespace() return -EEXIST, because cfg80211 doesn't strip altnames. The rare alternative is an allocation failure.\nPR:L - With a phy delegated to a container, root in that user-namespace-owned netns, which is unprivileged on the host, can add the altname via RTM_NEWLINKPROP and destroy the netns. Moving a phy out of init_net yourself needs init-ns CAP_NET_ADMIN, and hwsim radios made in a user netns are deleted by hwsim_exit_net() before cfg80211 runs.\nUI:N - The container root adds the altname and exits the namespace on their own. No other user has to do anything.\nS:U - This is memory corruption in the host kernel's mac80211 interface list. Exploiting it is ordinary kernel privilege escalation within the same kernel authority; no hypervisor or IOMMU boundary is involved.\nC:H - The netdev is freed via needs_free_netdev, but its sdata stays on local->interfaces. Every received frame then makes __ieee80211_rx_handle_packet() read the freed sdata through list_for_each_entry_rcu(), which gives a use-after-free read of an object an attacker can reallocate.\nI:H - Later removal of a neighbouring interface (list_del_rcu) and ieee80211_remove_interfaces() write into and dereference the stale sdata. That is a use-after-free write that heap reallocation could turn into memory corruption.\nA:H - The dangling entry crashes the kernel: the commit shows a BUG in wiphy_to_rdev() reached from ieee80211_remove_interfaces() during ieee80211_unregister_hw(), and frame RX can touch freed memory."
    }
  }
}