An issue was discovered in drivers/net/ethernet/arc/emac_main.c in the Linux kernel before 4.5. A use-after-free is caused by a race condition between the functions arc_emac_tx and arc_emac_tx_clean.
https://seclists.org/bugtraq/2019/Nov/11
https://support.f5.com/csp/article/K01993501?utm_source=f5support&%3Butm_medium=RSS