CVE-2026-46170: mptcp: pm: ADD_ADDR rtx: free sk if last
In the Linux kernel, the following vulnerability has been resolved:
Other sources
mptcp: pm: ADDADDR rtx: free sk if last
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.143.1-1 - Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 6.1.187-1Fixed in 6.12.107-1Fixed in 7.2.6-1Fixed in 7.2.7-1 - Compensating control
In the MPTCP ADD_ADDR retransmission timer handler, mark the timer as done at the end when it has not been rescheduled, avoid calling sk_stop_timer_sync() on the timer itself, and call sock_put() instead of __sock_put() so the socket is freed safely when it is the last reference.
Event History
Frequently Asked Questions
What is the severity of CVE-2026-46170?
CVE-2026-46170 has a severity level of medium, with a CVSS score of 5.5.
What systems are affected by CVE-2026-46170?
CVE-2026-46170 affects the Linux kernel, specifically the Microsoft azl3 kernel version 6.6.141.1-1.
How do I fix CVE-2026-46170?
To fix CVE-2026-46170, update your Linux kernel to the latest version where the vulnerability has been patched.
What is the impact of CVE-2026-46170?
The impact of CVE-2026-46170 can lead to memory management issues due to improper handling of socket references.
When was CVE-2026-46170 published?
CVE-2026-46170 was published on May 28, 2026.