Riskcovery

CVE-2026-98130

sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START

State
Published
Severity
8.1 High
Published
Sep 25, 2026
Updated
Oct 19, 2026
Reserved
Sep 25, 2026

Read the record on cve.org

Description

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.

Scores

CVSSScoreVectorSource
3.18.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before cbf2df9aac4202f9fb0b361a7fe8c79b29fad92cAffected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before 3205a20f837f5b1f009427ac3d9f706bf8a6fbecAffected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before 755d70ca845fd9b87c7b338ae6ae832b08cd0005Affected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before 09e7f9290d63178f56095d5c18fb9f9470153db5Affected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9Affected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before 00b841bac10230c557be6b38efc48508198fe23eAffected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before 3d698d1e6c8bc41e3e1707777a016f1bdd07842dAffected
  • 20a785aa52c82246055a089e55df9dac47d67da1 to before 2188569e7e1b0bc3f3b557dc97ab7a02befc11c8Affected
  • 9c0a4652f750afe3b4468cbcd9335b244ce2facdAffected
  • 70989e501fbce502198d82da88358ce453575a05Affected
  • 085bb270b4b1168c93afb37bbafc881207d15443Affected
  • 4.19.126 to before 4.20Affected
  • 5.4.44 to before 5.5Affected
  • 5.6.16 to before 5.7Affected
LinuxLinux
  • 5.7Affected
  • before 5.7Not affected
  • 5.10.271 through 5.10.*Not affected
  • 5.15.222 through 5.15.*Not affected
  • 6.1.189 through 6.1.*Not affected
  • 6.6.158 through 6.6.*Not affected
  • 6.12.111 through 6.12.*Not affected
  • 6.18.53 through 6.18.*Not affected
  • 7.2.7 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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