DENX U-Boot through 2018.09-rc1 has a remotely exploitable buffer overflow via a malicious TFTP server because TFTP traffic is mishandled. Also, local exploitation can occur via a crafted kernel image.
{ "urgency": "unimportant" }
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2018-18439.json"