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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 5293efe62df81908f2e90c9820c7edcc8e61f5e9, < 8b68e53d56697a59b5c53893b53f508bbdf272a0; >= 5293efe62df81908f2e90c9820c7edcc8e61f5e9, < 6204bf78b2a903b96ba43afff6abc0b04d6e0462; >= 5293efe62df81908f2e90c9820c7edcc8e61f5e9, < a75987714bd2d8e59840667a28e15c1fa5c47554; >= 5293efe62df81908f2e90c9820c7edcc8e61f5e9, < 72f2dc8993f10262092745a88cb2dd0fef094f23; >= 5293efe62df81908f2e90c9820c7edcc8e61f5e9, < fd1894224407c484f652ad456e1ce423e89bb3eb |
| Linux | Linux | 4.9 |
References
- https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462Patch
- https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23Patch
- https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0Patch
- https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554Patch
- https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3ebPatch
Timeline
- Published
- Jun 18, 2025
- Last modified
- Nov 5, 2026
- NVD status
- Analyzed