CVE-2021-47668: Linux Kernel

High severity, CVSS 8.8. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: can: dev: can_restart: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netif_rx_ni() in: stats->rx_bytes += cf->len; Reordering the lines solves the issue.

Affected products

• Linux Linux Kernel: from 2.6.31, before 4.4.254 (fixed in 4.4.254); from 4.5, before 4.9.254 (fixed in 4.9.254); from 4.10, before 4.14.218 (fixed in 4.14.218); from 4.15, before 4.19.171 (fixed in 4.19.171); from 4.20, before 5.4.93 (fixed in 5.4.93); from 5.5, before 5.10.11 (fixed in 5.10.11); …

Published 2025-04-17. Last modified 2026-08-04.