CVE-2026-23247

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1Patch
• https://git.kernel.org/stable/c/46e5b0d7cf55821527adea471ffe52a5afbd9cafPatch
• https://git.kernel.org/stable/c/eae2f14ab2efccdb7480fae7d42c4b0116ef8805Patch
• https://git.kernel.org/stable/c/5da5662181ef8a251e3ba564903002c2e87de452