Tracker / CVE-2026-63867
CVE-2026-63867
High 8.2
In the Linux kernel, the following vulnerability has been resolved: mptcp: close TOCTOU race while computing rcv_wnd The MPTCP output path access locklessly the MPTCP-level ack_seq in multiple times, using possibly different values for the data_ack in the DSS option and to compute the announced rcv wnd for the same packet. Refactor the cote to avoid inconsistencies which may confuse the peer. Also ensure that the MPTCP level rcv wnd is updated only when the egress packet actually contains a DSS ack.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 5.11 → 5.15.210 |
| linux | linux_kernel · 5.16 → 6.1.176 |
| linux | linux_kernel · 6.13 → 6.18.36 |
| linux | linux_kernel · 6.19 → 7.0.13 |
| linux | linux_kernel · 6.2 → 6.6.143 |
| linux | linux_kernel · 6.7 → 6.12.94 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.