CVE-2022-49975
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
18/06/2025
Last modified:
18/06/2025
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
bpf: Don&#39;t redirect packets with invalid pkt_len<br />
<br />
Syzbot found an issue [1]: fq_codel_drop() try to drop a flow whitout any<br />
skbs, that is, the flow->head is null.<br />
The root cause, as the [2] says, is because that bpf_prog_test_run_skb()<br />
run a bpf prog which redirects empty skbs.<br />
So we should determine whether the length of the packet modified by bpf<br />
prog or others like bpf_prog_test is valid before forwarding it directly.
Impact
References to Advisories, Solutions, and Tools
- 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