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A medium severity vulnerability (CVE-2026-46170) in the Linux kernel's Multipath TCP (MPTCP) implementation was resolved. The issue involves improper handling of socket references during retransmission of ADD_ADDR messages, which could cause indefinite waiting in the timer handler and potentially lead to denial of service. Multiple Linux kernel versions prior to 7.0.0-28.28 and related builds are affected. A patch is available and included in updated Ubuntu kernel packages. Users should update and reboot to apply the fix.

CVE-2026-46170 addresses a flaw in the Linux kernel's Multipath TCP path manager where retransmitted ADD_ADDR messages cause improper socket reference handling. Specifically, when an ADD_ADDR is retransmitted, the socket is held in sk_reset_timer() and released at the end. If this is the last reference, the socket is not freed correctly, leading to a call to sk_stop_timer_sync() on the same timer, causing indefinite waiting. The fix involves marking the timer as done at the end of the handler to prevent this deadlock. This vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds distributed by Ubuntu. The issue has a CVSS 3.1 score of 5.5 (medium severity) with local attack vector, low complexity, requiring low privileges and no user interaction, impacting availability only.

Detailed information about UBUNTU-CVE-2026-46170 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-46170 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: mptcp: pm: ADD_ADDR rtx: free sk if last When an ADD_ADDR is retransmitted, the… (CVE-2026-46170)

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