A use-after-free issue in the mac80211 stack when parsing a multi-BSSID element could be exploited by attackers able to inject WLAN frames to crash the kernel and potentially execute code. This issue is related to a logic error in the code, specifically in the `ieee802 11 parse elems crc` function of `util.c`, which could lead to remote code execution without additional execution privileges needed. User interaction is not required for exploitation.