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

Status: published. Published: 2025-06-18. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 5293efe62df81908f2e90c9820c7edcc8e61f5e9; < 8b68e53d56697a59b5c53893b53f508bbdf272a0 (affected, git); ≥ 5293efe62df81908f2e90c9820c7edcc8e61f5e9; < 6204bf78b2a903b96ba43afff6abc0b04d6e0462 (affected, git); ≥ 5293efe62df81908f2e90c9820c7edcc8e61f5e9; < a75987714bd2d8e59840667a28e15c1fa5c47554 (affected, git); ≥ 5293efe62df81908f2e90c9820c7edcc8e61f5e9; < 72f2dc8993f10262092745a88cb2dd0fef094f23 (affected, git); ≥ 5293efe62df81908f2e90c9820c7edcc8e61f5e9; < fd1894224407c484f652ad456e1ce423e89bb3eb (affected, git). Source: CNA: Linux
- Linux / Linux: 4.9 (affected); ≥ 0; < 4.9 (unaffected, semver); ≥ 5.4.212; ≤ 5.4.* (unaffected, semver); ≥ 5.10.141; ≤ 5.10.* (unaffected, semver); ≥ 5.15.65; ≤ 5.15.* (unaffected, semver); ≥ 5.19.7; ≤ 5.19.* (unaffected, semver); ≥ 6.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.27% as of 2026-11-05; percentile 18.61%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0 (CNA: Linux)

- https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462 (CNA: Linux)

- https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554 (CNA: Linux)

- https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23 (CNA: Linux)

- https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3eb (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49975; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49975; retrieved 2026-11-05; source updated Not reported

Revision: 74b6ee1707f048c56537ad48de6214a1b124a2e1fec00ac04d19721852460b14

Canonical: https://y2.dev/cve/CVE-2022-49975

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