CVE-2022-49975
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.
| Software | From | Fixed in |
|---|---|---|
| linux / linux_kernel | - | 5.4.212 |
| linux / linux_kernel | 5.5 | 5.10.141 |
| linux / linux_kernel | 5.11 | 5.15.65 |
| linux / linux_kernel | 5.16 | 5.19.7 |
- 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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