CVE-2026-98130 is a vulnerability in Linux Kernel
Published on September 25, 2026
sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
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.
Products Associated with CVE-2026-98130
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version 20a785aa52c82246055a089e55df9dac47d67da1 and below e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9 is affected.
- Version 20a785aa52c82246055a089e55df9dac47d67da1 and below 00b841bac10230c557be6b38efc48508198fe23e is affected.
- Version 20a785aa52c82246055a089e55df9dac47d67da1 and below 3d698d1e6c8bc41e3e1707777a016f1bdd07842d is affected.
- Version 20a785aa52c82246055a089e55df9dac47d67da1 and below 2188569e7e1b0bc3f3b557dc97ab7a02befc11c8 is affected.
- Version 9c0a4652f750afe3b4468cbcd9335b244ce2facd is affected.
- Version 70989e501fbce502198d82da88358ce453575a05 is affected.
- Version 085bb270b4b1168c93afb37bbafc881207d15443 is affected.
- Version 4.19.126 and below 4.20 is affected.
- Version 5.4.44 and below 5.5 is affected.
- Version 5.6.16 and below 5.7 is affected.
- Version 5.7 is affected.
- Before 5.7 is unaffected.
- Version 6.12.111, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.