Description
A 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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service | — | — |
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions | — | — |
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support | — | — |
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | corosync | 3.1.10-2 | — |
| Debian 13 | corosync | 3.1.9-2+deb13u1 | — |
| Debian 12 | corosync | 3.1.7-1+deb12u2 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | corosync | 3.1.9-2ubuntu1.1 | USN-8170-1 |
| Ubuntu 24.04 LTS | corosync | 3.1.7-1ubuntu3.2 | USN-8170-1 |
| Ubuntu 22.04 LTS | corosync | 3.1.6-1ubuntu1.2 | USN-8170-1 |
| Ubuntu 20.04 LTS | corosync | No fix yet | — |
| Ubuntu 18.04 LTS | corosync | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | corosync | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | corosync +3 | 3.1.9-2.el10_1.1 | RHSA-2026:19043, RHSA-2026:13644 |
| RHEL 9 | corosync +3 | 3.1.9-2.el9_7.1 | RHSA-2026:19200, RHSA-2026:13673 |
| RHEL 8 | corosync +4 | 3.1.8-1.el8_10.1 | RHSA-2026:13657 |
| RHEL 7 | corosync +5 | 2.4.5-7.el7_9.3 | RHSA-2026:20916 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10.0 EUS | corosync +3 | 3.1.9-1.el10_0.2 | RHSA-2026:14205 |
| RHEL 9.6 EUS | corosync +3 | 3.1.9-2.el9_6.1 | RHSA-2026:14213 |
| RHEL 9.4 EUS | corosync +3 | 3.1.8-1.el9_4.1 | RHSA-2026:14212 |
| RHEL 9.2 E4S | corosync +2 | 3.1.7-1.el9_2.1 | RHSA-2026:14210 |
| RHEL 9.0 E4S | corosync +2 | 3.1.5-3.el9_0.1 | RHSA-2026:14211 |
| RHEL 8.8 TUS | corosync +3 | 3.1.7-1.el8_8.1 | RHSA-2026:14216 |
| RHEL 8.8 E4S | corosync +3 | 3.1.7-1.el8_8.1 | RHSA-2026:14216 |
| RHEL 8.6 TUS | corosync +3 | 3.1.5-2.el8_6.1 | RHSA-2026:14214 |
| RHEL 8.6 E4S | corosync +3 | 3.1.5-2.el8_6.1 | RHSA-2026:14214 |
| RHEL 8.6 AUS | corosync +1 | 3.1.5-2.el8_6.1 | RHSA-2026:14214 |
| RHEL 8.4 EUS Long Life | corosync +3 | 3.1.0-3.el8_4.2 | RHSA-2026:14215 |
| RHEL 8.4 AUS | corosync +3 | 3.1.0-3.el8_4.2 | RHSA-2026:14215 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | corosync +3 | 3.1.9-2.el10_1.1 | ALSA-2026:19043, ALSA-2026:13644 |
| AlmaLinux 9 | corosync +3 | 3.1.9-2.el9_7.1 | ALSA-2026:19200, ALSA-2026:13673 |
| AlmaLinux 8 | corosync +4 | 3.1.8-1.el8_10.1 | ALSA-2026:13657 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | corosync | 3.1.9-2.el10_1.1 | RLSA-2026:19043, RLSA-2026:13644 |
| Rocky Linux 9 | corosync | 3.1.9-2.el9_7.1 | RLSA-2026:19200, RLSA-2026:13673 |
| Rocky Linux 8 | corosync | 3.1.8-1.el8_10.1 | RLSA-2026:13657 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | corosync | 2.4.6-150300.12.16.1 | SUSE-SU-2026:1394-1 |
| SLES 15 SP6 | corosync | 2.4.6-150300.12.16.1 | SUSE-SU-2026:1394-1 |
| SLES 15 SP5 | corosync | 2.4.6-150300.12.16.1 | SUSE-SU-2026:1394-1 |
| SLES 15 SP4 | corosync | 2.4.6-150300.12.16.1 | SUSE-SU-2026:1394-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | corosync | 3.1.9-160000.3.1 | SUSE-SU-2026:21224-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | corosync | 3.1.9-160000.3.1 | openSUSE-SU-2026:20505-1 |
| openSUSE Leap 15.6 | corosync | 2.4.6-150300.12.16.1 | SUSE-SU-2026:1394-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | corosync +3 | 3.1.9-3.amzn2023.0.2 | ALAS2023-2026-1560 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | corosync | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | corosync +2 | 3.1.9-2.el10_1.1 | ELSA-2026-19043, ELSA-2026-13644 |
| Oracle Linux 9 | corosync +2 | 3.1.9-2.el9_7.1 | ELSA-2026-19200, ELSA-2026-13673 |
| Oracle Linux 8 | corosync +2 | 3.1.8-1.el8_10.1 | ELSA-2026-13657 |
Advisories 35
- ALSA-2026:13644 Moderate: corosync security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:19200 Moderate: corosync security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:13673 Moderate: corosync security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:19043 Moderate: corosync security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:13657 Moderate: corosync security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:20916 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:19200 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:19043 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14215 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14216 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14214 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14213 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14211 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14212 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14205 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:14210 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:13673 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:13657 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- RHSA-2026:13644 Red Hat Security Advisory: corosync security update Red Hat Security Advisories (RHSA) · Oct 3, 2026
- WID-SEC-2026-1358 Red Hat Enterprise Linux (corosync): Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Aug 9, 2026
- ELSA-2026-19043 Moderate: corosync security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
- ELSA-2026-19200 Moderate: corosync security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 12, 2026
- RLSA-2026:19043 Moderate: corosync security update Rocky Linux Security Advisories · May 29, 2026
- RLSA-2026:19200 Moderate: corosync security update Rocky Linux Security Advisories · May 28, 2026
- ELSA-2026-13673 Moderate: corosync security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 11, 2026
- ELSA-2026-13657 Moderate: corosync security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 8, 2026
- RLSA-2026:13644 Moderate: corosync security update Rocky Linux Security Advisories · May 6, 2026
- RLSA-2026:13673 Moderate: corosync security update Rocky Linux Security Advisories · May 6, 2026
- RLSA-2026:13657 Moderate: corosync security update Rocky Linux Security Advisories · May 6, 2026
- ELSA-2026-13644 Moderate: corosync security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · May 5, 2026
- USN-8170-1 corosync vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2026:20505-1 Security update for corosync SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:21224-1 Security update for corosync SUSE / openSUSE Security Updates · Apr 22, 2026
- SUSE-SU-2026:1394-1 Security update for corosync SUSE / openSUSE Security Updates · Apr 17, 2026
- ALAS2023-2026-1560 Important: corosync security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 13, 2026
References
- RHSA-2026:13644 vendor-advisory
- RHSA-2026:13657 vendor-advisory
- RHSA-2026:13673 vendor-advisory
- RHSA-2026:14205 vendor-advisory
- RHSA-2026:14210 vendor-advisory
- RHSA-2026:14211 vendor-advisory
- RHSA-2026:14212 vendor-advisory
- RHSA-2026:14213 vendor-advisory
- RHSA-2026:14214 vendor-advisory
- RHSA-2026:14215 vendor-advisory
- RHSA-2026:14216 vendor-advisory
- RHSA-2026:19043 vendor-advisory
- RHSA-2026:19200 vendor-advisory
- RHSA-2026:20916 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-35092 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=2453169
- RHBZ#2453814 issue-tracking