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://usn.ubuntu.com/4163-2/
https://usn.ubuntu.com/4163-1/
https://support.f5.com/csp/article/K01993501?utm_source=f5support&%3Butm_medium=RSS