CVE-2021-47388 | BDVDB-2026-236821 Detail
LinuxLinux
Description#
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: adjacent.
Weaknesses#
No weakness recorded in the source data.
References#
- https://git.kernel.org/stable/c/447d001b875d0e7f211c4ba004916028da994258
- https://git.kernel.org/stable/c/31de381aef0ab1b342f62485118dc8a19363dc78
- https://git.kernel.org/stable/c/f556e1d6fb9f2923a9a36f3df638c7d79ba09dbb
- https://git.kernel.org/stable/c/3d5d629c99c468458022e9b381789de3595bf4dd
- https://git.kernel.org/stable/c/50149e0866a82cef33e680ee68dc380a5bc75d32
- https://git.kernel.org/stable/c/57de2dcb18742dc2860861c9f496da7d42b67da0
- https://git.kernel.org/stable/c/27d3eb5616ee2c0a3b30c3fa34813368ed1f3dc9
- https://git.kernel.org/stable/c/94513069eb549737bcfc3d988d6ed4da948a2de8
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.