Vulnerability details

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: unlist vifs when their netdev is unregistered mac80211 only removes vifs from the local->interfaces list when an interface is removed via ieee80211_if_remove(), before it unregisters the netdev. However, it's possible for a netdev to be unregistered without going through that: When the netns that holds the wiphy is destroyed, the wiphy is supposed to move to the init_ns, but that can run into allocation failures. Then, mac80211 has an interface listed that doesn't exist, and will eventually hit BUG: failure at net/wireless/core.h:141/wiphy_to_rdev()! ... _cfg80211_unregister_wdev+0x24/0x36a [cfg80211] cfg80211_unregister_wdev+0x15/0x1d [cfg80211] ieee80211_remove_interfaces+0x1ff/0x257 [mac80211] ieee80211_unregister_hw+0x73/0x1d1 [mac80211] mac80211_hwsim_del_radio+0x114/0x166 [mac80211_hwsim] Remove the interface from the list in ->ndo_uninit if it's still around to avoid this.

• https://git.kernel.org/stable/c/a22c02863439993095acd0c3db97fa53cd515f4f
• https://git.kernel.org/stable/c/20a56e96a6f7b4dfbd13f8732fd2673409fc7ba0
• https://git.kernel.org/stable/c/b735ad1a9aca6080192c1316cf2706e5e1318762
• https://git.kernel.org/stable/c/d45bf731ec7085d2cc2c5d179d3b3b6c743d4fb1
• https://git.kernel.org/stable/c/821bab0456dfca12acef6df702c8f2477d313227
• https://git.kernel.org/stable/c/eee2efd82867b623982ac51925b5a1812a74c50d