Denial of Service Vulnerability in OpenBSD Kernel Version <= 6.5 through TCP SACK Packet Exploitation

CVE-2019-8460 · HIGH Severity

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.

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