CVE-2022-49204

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

bpf, sockmap: Fix more uncharged while msg has more_data

In tcp_bpf_send_verdict(), if msg has more data after

tcp_bpf_sendmsg_redir():

tcp_bpf_send_verdict()

tosend = msg->sg.size //msg->sg.size = 22220

case __SK_REDIRECT:

sk_msg_return() //uncharged msg->sg.size(22220) sk->sk_forward_alloc

tcp_bpf_sendmsg_redir() //after tcp_bpf_sendmsg_redir, msg->sg.size=11000

goto more_data;

tosend = msg->sg.size //msg->sg.size = 11000

case __SK_REDIRECT:

sk_msg_return() //uncharged msg->sg.size(11000) to sk->sk_forward_alloc

The msg->sg.size(11000) has been uncharged twice, to fix we can charge the

remaining msg->sg.size before goto more data.

This issue can cause the following info:

WARNING: CPU: 0 PID: 9860 at net/core/stream.c:208 sk_stream_kill_queues+0xd4/0x1a0

Call Trace:

<TASK>

inet_csk_destroy_sock+0x55/0x110

__tcp_close+0x279/0x470

tcp_close+0x1f/0x60

inet_release+0x3f/0x80

__sock_release+0x3d/0

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References