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high8.8

CVE-2021-47388

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix use-after-free in CCMP/GCMP RX When PN checking is done in mac80211, for frag…

Impact

In the Linux kernel, the following vulnerability has been resolved: mac80211: fix use-after-free in CCMP/GCMP RX When PN checking is done in mac80211, for fragmentation we need to copy the PN to the RX struct so we can later use it to do a comparison, since commit bf30ca922a0c ("mac80211: check defrag PN against current frame"). Unfortunately, in that commit I used the 'hdr' variable without it being necessarily valid, so use-after-free could occur if it was necessary to reallocate (parts of) the frame. Fix this by reloading the variable after the code that results in the reallocations, if any. This fixes https://bugzilla.kernel.org/show_bug.cgi?id=214401.

Affected products

VendorProductAffected versions
LinuxLinux Kernel
from 4.4.271 before 4.4.286
from 4.9.271 before 4.9.285
from 4.14.235 before 4.14.249
from 4.19.193 before 4.19.209
from 5.4.124 before 5.4.151
from 5.10.42 before 5.10.71

Weakness classification

CWE-416

References