CVE-2022-49975

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux5293efe62df81908f2e90c9820c7edcc8e61f5e9 < 8b68e53d56697a59b5c53893b53f508bbdf272a0affected
LinuxLinux5293efe62df81908f2e90c9820c7edcc8e61f5e9 < 6204bf78b2a903b96ba43afff6abc0b04d6e0462affected
LinuxLinux5293efe62df81908f2e90c9820c7edcc8e61f5e9 < a75987714bd2d8e59840667a28e15c1fa5c47554affected
LinuxLinux5293efe62df81908f2e90c9820c7edcc8e61f5e9 < 72f2dc8993f10262092745a88cb2dd0fef094f23affected
LinuxLinux5293efe62df81908f2e90c9820c7edcc8e61f5e9 < fd1894224407c484f652ad456e1ce423e89bb3ebaffected
LinuxLinux4.9affected
LinuxLinux0 < 4.9unaffected
LinuxLinux5.4.212 <= 5.4.*unaffected
LinuxLinux5.10.141 <= 5.10.*unaffected
LinuxLinux5.15.65 <= 5.15.*unaffected
LinuxLinux5.19.7 <= 5.19.*unaffected
LinuxLinux6.0 <= *unaffected

Weaknesses

References