Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5293efe62df81908f2e90c9820c7edcc8e61f5e9 before 8b68e53d56697a59b5c53893b53f508bbdf272a0; affected 5293efe62df81908f2e90c9820c7edcc8e61f5e9 before 6204bf78b2a903b96ba43afff6abc0b04d6e0462; affected 5293efe62df81908f2e90c9820c7edcc8e61f5e9 before a75987714bd2d8e59840667a28e15c1fa5c47554; affected 5293efe62df81908f2e90c9820c7edcc8e61f5e9 before 72f2dc8993f10262092745a88cb2dd0fef094f23; affected 5293efe62df81908f2e90c9820c7edcc8e61f5e9 before fd1894224407c484f652ad456e1ce423e89bb3eb |
| Linux / Linux | affected 4.9; unaffected 0 before 4.9; unaffected 5.4.212 through 5.4.*; unaffected 5.10.141 through 5.10.*; unaffected 5.15.65 through 5.15.*; unaffected 5.19.7 through 5.19.*; unaffected 6.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/8b68e53d56697a59b5c53893b53f508bbdf272a0
- https://git.kernel.org/stable/c/6204bf78b2a903b96ba43afff6abc0b04d6e0462
- https://git.kernel.org/stable/c/a75987714bd2d8e59840667a28e15c1fa5c47554
- https://git.kernel.org/stable/c/72f2dc8993f10262092745a88cb2dd0fef094f23
- https://git.kernel.org/stable/c/fd1894224407c484f652ad456e1ce423e89bb3eb