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CVE-2022-49975: bpf: Don't redirect packets with invalid pkt_len

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-18 · updated 2026-06-17

Description

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 kernel: before 5.4.212; from 5.5 before 5.10.141; from 5.11 before 5.15.65; from 5.16 before 5.19.7 — fixed in 5.10.141, 5.15.65, 5.19.7, 5.4.212

How to fix

Upgrade to a fixed version: Linux kernel 5.10.141, 5.15.65, 5.19.7, 5.4.212. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462
• https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23
• https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0
• https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554
• https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3eb

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