CVE-2022-50706

/// Technical description

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

net/ieee802154: don't warn zero-sized raw_sendmsg()

syzbot is hitting skb_assert_len() warning at __dev_queue_xmit() [1],

for PF_IEEE802154 socket's zero-sized raw_sendmsg() request is hitting

__dev_queue_xmit() with skb->len == 0.

Since PF_IEEE802154 socket's zero-sized raw_sendmsg() request was

able to return 0, don't call __dev_queue_xmit() if packet length is 0.

----------

#include <sys/socket.h>

#include <netinet/in.h>

int main(int argc, char *argv[])

{

struct sockaddr_in addr = { .sin_family = AF_INET, .sin_addr.s_addr = htonl(INADDR_LOOPBACK) };

struct iovec iov = { };

struct msghdr hdr = { .msg_name = &addr, .msg_namelen = sizeof(addr), .msg_iov = &iov, .msg_iovlen = 1 };

sendmsg(socket(PF_IEEE802154, SOCK_RAW, 0), &hdr, 0);

return 0;

}

----------

Note that this might be a sign that commit fd1894224407c484 ("bpf: Don't

redirect packets with invalid pkt_len") should be rev

/// 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