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CVE-2022-48784

Disclosure Date: July 16, 2024
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Description

In the Linux kernel, the following vulnerability has been resolved:

cfg80211: fix race in netlink owner interface destruction

My previous fix here to fix the deadlock left a race where
the exact same deadlock (see the original commit referenced
below) can still happen if cfg80211_destroy_ifaces() already
runs while nl80211_netlink_notify() is still marking some
interfaces as nl_owner_dead.

The race happens because we have two loops here – first we
dev_close() all the netdevs, and then we destroy them. If we
also have two netdevs (first one need only be a wdev though)
then we can find one during the first iteration, close it,
and go to the second iteration — but then find two, and try
to destroy also the one we didn’t close yet.

Fix this by only iterating once.

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General Information

Vendors

  • Linux

Products

  • Linux

Additional Info

Technical Analysis