CVE-2026-23247
tcp: secure_seq: add back ports to TS offset
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Mar 18, 2026 |
| Last Updated | Apr 13, 2026 |
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Affected Versions
Linux / Linux
28ee1b746f493b7c62347d714f58fbf4f70df4f0 < eae2f14ab2efccdb7480fae7d42c4b0116ef8805 28ee1b746f493b7c62347d714f58fbf4f70df4f0 < 46e5b0d7cf55821527adea471ffe52a5afbd9caf 28ee1b746f493b7c62347d714f58fbf4f70df4f0 < 165573e41f2f66ef98940cf65f838b2cb575d9d1 443fac9f2618b93cbc5ab068dc594530236b3a23
Linux / Linux
4.11