CVE-2024-46711: mptcp: pm: fix ID 0 endp usage after multiple re-creations

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-09-13 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: fix ID 0 endp usage after multiple re-creations 'local_addr_used' and 'add_addr_accepted' are decremented for addresses not related to the initial subflow (ID0), because the source and destination addresses of the initial subflows are known from the beginning: they don't count as "additional local address being used" or "ADD_ADDR being accepted". It is then required not to increment them when the entrypoint used by the initial subflow is removed and re-added during a connection. Without this modification, this entrypoint cannot be removed and re-added more than once.

Affected products

Linux kernel: from 6.0 before 6.1.109; from 6.2 before 6.6.49; from 6.7 before 6.10.8; 6.11-rc1, 6.11-rc2, 6.11-rc3, 6.11-rc4, 6.11-rc5 — fixed in 6.1.109, 6.10.8, 6.6.49

How to fix

Upgrade to a fixed version: Linux kernel 6.1.109, 6.10.8, 6.6.49. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-46711 or the next vulnerability affects your stack