CVE-2026-23247

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Source

https://cve.org/CVERecord?id=CVE-2026-23247

Import Source

JSON Data

https://api.test.osv.dev/v1/vulns/CVE-2026-23247

Downstream

Published

2026-03-18T10:05:09.353Z

Modified

2026-05-15T04:14:27.020950111Z

Summary

tcp: secure_seq: add back ports to TS offset

Details

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")

tcptwrecycle 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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23247.json",
    "cna_assigner": "Linux"
}

References

Affected packages

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-23247.json"