Remote Vulnerability in Corosync Affects Membership Commit Token
CVE-2026-35091

8.2HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
Vendor
CVE Published:
1 April 2026

What is CVE-2026-35091?

A vulnerability exists in Corosync, specifically related to the membership commit token's sanity check. An unauthenticated attacker can exploit this flaw by sending a specially crafted User Datagram Protocol (UDP) packet, leading to an out-of-bounds read situation. This exploitation can cause a denial of service (DoS) by disrupting the normal operation of Corosync and may unintentionally reveal sensitive memory contents. This issue is particularly relevant when Corosync operates in its default configuration using totemudp/totemudpu mode.

Affected Version(s)

Red Hat Enterprise Linux 10 0:3.1.9-2.el10_1.1

Red Hat Enterprise Linux 10 0:3.1.10-1.el10_2.1

Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.1.9-1.el10_0.2

References

https://access.redhat.com/errata/RHSA-2026:13644
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13657
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:13673
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Sebastián Alba Vives for reporting this issue.
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