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.
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HOpenbsd
OSOpenbsd≤ 6.5
🟢
PATCH AVAILABLE
Vendor update available. Deploy in standard maintenance cycle.
Tags
DoS
References
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