CVE-2021-47520: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: can: pch_can: pch_can_rx_normal: fix use after free After calling netif_receive_skb(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is dereferenced just after the call netif_receive_skb(skb). Reordering the lines solves the issue.

Affected products

• Linux Linux Kernel: from 2.6.37, before 4.4.295 (fixed in 4.4.295); from 4.5, before 4.9.293 (fixed in 4.9.293); from 4.10, before 4.14.258 (fixed in 4.14.258); from 4.15, before 4.19.221 (fixed in 4.19.221); from 4.20, before 5.4.165 (fixed in 5.4.165); from 5.5, before 5.10.85 (fixed in 5.10.85); …

Published 2024-05-24. Last modified 2026-08-04.