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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.24%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.24% probability · 15th percentile
- CISA KEV
- Not listed
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.