CVE-2026-98130

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix a TOCTOU race in SCTP CMD TIMER START

The SCTP CMD TIMER START handler checks timer pending() before calling timer reduce(). The timer can expire and detach between these operations, causing timer reduce() to rearm the timer without taking the association reference required for the newly armed timer.

The timer callback later unconditionally drops its association reference, which can leave the association reference count unbalanced and result in use-after-free during association teardown.

Use the return value of timer reduce() to determine whether the timer was actually armed. Take the association reference only when timer reduce() successfully starts a new timer, closing the race between checking the timer state and rearming it.

This issue was reported by Nico Yip (@ cyeaa ) working with TrendAI Zero Day Initiative.