CVE-2026-63867
HIGH
MEDIUM
Priority: 0.02
BB Relevance:
76/100
Published: 2026-07-19
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
Low
A:
High
Description
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 Software (12)
| Vendor | Product | Version |
|---|---|---|
| linux | linux_kernel | 5.11 – 5.15.210 |
| linux | linux_kernel | 5.16 – 6.1.176 |
| linux | linux_kernel | 6.2 – 6.6.143 |
| linux | linux_kernel | 6.7 – 6.12.94 |
| linux | linux_kernel | 6.13 – 6.18.36 |
| linux | linux_kernel | 6.19 – 7.0.13 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
| linux | linux_kernel | 7.1 |
References & Advisories (7)
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