CVE-2024-46711 mptcp: pm: fix ID 0 endp usage after multiple re-creations
A logic error in the Linux kernel MPTCP path manager prevents re-adding the initial subflow entrypoint, potentially causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-46711?
CVE-2024-46711 is a medium-severity denial of service vulnerability in Linux kernel, published on 13 Sep 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2024-46711?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-46711?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-46711 being exploited?
There is no known exploitation of CVE-2024-46711 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-46711, DEBIAN-CVE-2024-46711, GHSA-jm64-jw7h-ffg2, UBUNTU-CVE-2024-46711.