Corosync: corosync: denial of service via integer overflow in join message validation

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Summary

CVECVE-2026-35092
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-01 14:16:57 UTC
Updated2026-05-26 16:16:23 UTC
DescriptionA flaw was found in Corosync. An integer overflow vulnerability in Corosync's join message sanity validation allows a remote, unauthenticated attacker to send crafted User Datagram Protocol (UDP) packets. This can cause the service to crash, leading to a denial of service. This vulnerability specifically affects Corosync deployments configured to use totemudp/totemudpu mode.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.003640000 probability, percentile 0.586630000 (date 2026-05-28)

Problem Types: CWE-190 | CWE-190 Integer Overflow or Wraparound

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Corosync Corosync - All All All
Operating System Redhat Enterprise Linux 10.0 All All All
Operating System Redhat Enterprise Linux 7.0 All All All
Operating System Redhat Enterprise Linux 8.0 All All All
Operating System Redhat Enterprise Linux 9.0 All All All
Application Redhat Openshift 4.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.1.9-2.el10_1.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10 unaffected 0:3.1.10-1.el10_2.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support unaffected 0:3.1.9-1.el10_0.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support unaffected 0:2.4.5-7.el7_9.3 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:3.1.8-1.el8_10.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:3.1.0-3.el8_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On unaffected 0:3.1.0-3.el8_4.2 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support unaffected 0:3.1.5-2.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service unaffected 0:3.1.5-2.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Update Services For SAP Solutions unaffected 0:3.1.5-2.el8_6.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service unaffected 0:3.1.7-1.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions unaffected 0:3.1.7-1.el8_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.1.9-2.el9_7.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:3.1.10-1.el9_8.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Update Services For SAP Solutions unaffected 0:3.1.5-3.el9_0.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions unaffected 0:3.1.7-1.el9_2.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support unaffected 0:3.1.8-1.el9_4.1 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support unaffected 0:3.1.9-2.el9_6.1 * rpm Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified

References

ReferenceSourceLinkTags
access.redhat.com/errata/RHSA-2026:14205 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:14212 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:14213 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:13673 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:19200 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:14210 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:13644 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com Exploit, Third Party Advisory
access.redhat.com/errata/RHSA-2026:14211 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:19043 [email protected] access.redhat.com
access.redhat.com/security/cve/CVE-2026-35092 [email protected] access.redhat.com Third Party Advisory, VDB Entry
access.redhat.com/errata/RHSA-2026:20916 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:14216 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com Issue Tracking, Third Party Advisory
access.redhat.com/errata/RHSA-2026:14215 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:13657 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2026:14214 [email protected] access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Sebastián Alba Vives for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-04-01T11:32:04.388ZReported to Red Hat.
CNA2026-04-01T11:48:22.309ZMade public.

Workarounds

CNA: Systems using totemudp or totemudpu should migrate to the supported knet transport and enable encryption.

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