Security Advisory

CVE-2026-23247

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2026-03-18 10:05:09

Last updated 2026-05-23 16:04:20

Assigner Linux

State PUBLISHED

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: secure_seq: add back ports to TS offset This reverts 28ee1b746f49 ("secure_seq: downgrade to per-host timestamp offsets") tcp_tw_recycle went away in 2017. Zhouyan Deng reported off-path TCP source port leakage via SYN cookie side-channel that can be fixed in multiple ways. One of them is to bring back TCP ports in TS offset randomization. As a bonus, we perform a single siphash() computation to provide both an ISN and a TS offset.

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