CVE-2026-23247

None

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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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Related Identifiers

CVE-2026-23247

Linux