CVEvulnerability

CVE-2026-23247

5.5 MEDIUM Published 2026-03-18 Modified 2026-10-21 Official page ↗
Status
Modified
Published
2026-03-18
Last modified
2026-10-21
Assigner
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS 3.1 ([email protected])
5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

Affected configurations

• linux linux kernel (> 4.11 < 6.18.17) • linux linux kernel (>= 6.19 < 6.19.7) • linux linux kernel 4.10.14 • linux linux kernel 4.11 • linux linux kernel 7.0

References