CVE-2022-48784

Summary

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.

Affected Software

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

• https://git.kernel.org/stable/c/241e633cb379c4f332fc1baf2abec95ec840cbeb
• https://git.kernel.org/stable/c/c979f792a2baf6d0f3419587668a1a6eba46a3d2
• https://git.kernel.org/stable/c/f0a6fd1527067da537e9c48390237488719948ed

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://git.kernel.org/stable/c/241e633cb379c4f332fc1baf2abec95ec840cbeb
• https://git.kernel.org/stable/c/c979f792a2baf6d0f3419587668a1a6eba46a3d2
• https://git.kernel.org/stable/c/f0a6fd1527067da537e9c48390237488719948ed

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