CVE-2026-46137 mptcp: pm: ADD_ADDR rtx: fix potential data-race
A data race in the Linux kernel MPTCP path manager timer callback can lead to undefined behavior due to missing socket locking.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46137?
CVE-2026-46137 is a critical vulnerability in Linux kernel, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
mptcp: pm: ADD_ADDR rtx: fix potential data-race
This mptcp_pm_add_timer() helper is executed as a timer callback in softirq context. To avoid any data races, the socket lock needs to be held with bh_lock_sock().
If the socket is in use, retry again soon after, similar to what is done with the keepalive timer.
Weakness: CWE-362
Which versions are affected by CVE-2026-46137?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46137?
Apply the vendor's patch.
Is CVE-2026-46137 being exploited?
There is no known exploitation of CVE-2026-46137 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88983, BELL-CVE-2026-46137, DEBIAN-CVE-2026-46137, GHSA-cmf4-rm73-rfhx, ROOT-OS-DEBIAN-11-CVE-2026-46137, ROOT-OS-DEBIAN-12-CVE-2026-46137 and 4 more.