sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98130
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:44 UTC
Updated2026-10-22 15:26:06 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.005150000 probability, percentile 0.414910000 (date 2026-09-27)

Problem Types: CWE-362

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 3205a20f837f5b1f009427ac3d9f706bf8a6fbec git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 755d70ca845fd9b87c7b338ae6ae832b08cd0005 git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 09e7f9290d63178f56095d5c18fb9f9470153db5 git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9 git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 00b841bac10230c557be6b38efc48508198fe23e git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 3d698d1e6c8bc41e3e1707777a016f1bdd07842d git Not specified
CNA Linux Linux affected 20a785aa52c82246055a089e55df9dac47d67da1 2188569e7e1b0bc3f3b557dc97ab7a02befc11c8 git Not specified
CNA Linux Linux affected 9c0a4652f750afe3b4468cbcd9335b244ce2facd git Not specified
CNA Linux Linux affected 70989e501fbce502198d82da88358ce453575a05 git Not specified
CNA Linux Linux affected 085bb270b4b1168c93afb37bbafc881207d15443 git Not specified
CNA Linux Linux affected 4.19.126 4.20 semver Not specified
CNA Linux Linux affected 5.4.44 5.5 semver Not specified
CNA Linux Linux affected 5.6.16 5.7 semver Not specified
CNA Linux Linux affected 5.7 Not specified
CNA Linux Linux unaffected 5.7 semver Not specified
CNA Linux Linux unaffected 5.10.271 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.222 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/2188569e7e1b0bc3f3b557dc97ab7a02befc11c8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d698d1e6c8bc41e3e1707777a016f1bdd07842d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/09e7f9290d63178f56095d5c18fb9f9470153db5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3205a20f837f5b1f009427ac3d9f706bf8a6fbec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/00b841bac10230c557be6b38efc48508198fe23e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/755d70ca845fd9b87c7b338ae6ae832b08cd0005 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report