medium5.5
CVE-2026-23247
In the Linux kernel, the following vulnerability has been resolved: tcp: secure_seq: add back ports to TS offset This reverts 28ee1b746f49 ("secure_seq: downgr…
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | after 4.11 before 6.18.17 from 6.19 before 6.19.7 Versions 4.10.14, 4.11, 7.0 |
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/025f532d8c5cfac77845e50daab7f478b360f2ac
- https://git.kernel.org/stable/c/165573e41f2f66ef98940cf65f838b2cb575d9d1
- https://git.kernel.org/stable/c/46e5b0d7cf55821527adea471ffe52a5afbd9caf
- https://git.kernel.org/stable/c/5da5662181ef8a251e3ba564903002c2e87de452
- https://git.kernel.org/stable/c/e873e8c16b2fb743a381a9e59c108e63512301ec
- https://git.kernel.org/stable/c/eae2f14ab2efccdb7480fae7d42c4b0116ef8805