CVE-2026-23247
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Linux Kernel
PublishedMar 18, 2026
First seenMar 18, 2026
How to fix
Update
- linux linux_kernel6.18.17, 6.19.7 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.11 < v < 6.18.17, 6.19 ≤ v < 6.19.7, 4.10.14, 4.11, 7.0 | 6.18.17, 6.19.7 |
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