CVE-2022-49975: 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: bpf: Don't redirect packets with invalid pkt_len Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any skbs, that is, the flow->head is null. The root cause, as the [2] says, is because that bpf_prog_test_run_skb() run a bpf prog which redirects empty skbs. So we should determine whether the length of the packet modified by bpf prog or others like bpf_prog_test is valid before forwarding it directly.

Affected products

• Linux Linux Kernel: before 5.4.212 (fixed in 5.4.212); from 5.5, before 5.10.141 (fixed in 5.10.141); from 5.11, before 5.15.65 (fixed in 5.15.65); from 5.16, before 5.19.7 (fixed in 5.19.7)

Published 2025-06-18. Last modified 2026-06-17.