4.7

CVE-2022-48784

cfg80211: fix race in netlink owner interface destruction

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.12.1 < 5.15.25
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.11
Linux ≫ Linux Kernel Version5.17 Updaterc1
Linux ≫ Linux Kernel Version5.17 Updaterc2
Linux ≫ Linux Kernel Version5.17 Updaterc3
Linux ≫ Linux Kernel Version5.17 Updaterc4
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.17% 0.066
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 4.7 1 3.6
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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