PT-2026-29517 · Corosync+3 · Corosync+3

Sebasteuo / 0Xs4Bb1 + 1 · Published 2026-04-01 · Updated 2026-05-26 · CVE-2026-35092

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Corosync (affected versions not specified)

Description A flaw exists in Corosync where an integer overflow in the join message sanity validation can be triggered by sending crafted User Datagram Protocol (UDP) packets. This allows a remote, unauthenticated attacker to cause a denial of service by crashing the service. This vulnerability specifically impacts Corosync deployments using totemudp/totemudpu mode.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

DoS

Integer Overflow

Weakness Enumeration

CWE-190

Related Identifiers

ALSA-2026:13644

ALSA-2026:13657

ALSA-2026:13673

CVE-2026-35092

OESA-2026-1964

OESA-2026-1965

OESA-2026-1966

OESA-2026-2046

OESA-2026-2047

OPENSUSE-SU-2026:20505-1

RHSA-2026:13644

RHSA-2026:13657

RHSA-2026:13673

RHSA-2026:14205

RHSA-2026:14210

RHSA-2026:14211

RHSA-2026:14212

RHSA-2026:14213

RHSA-2026:14214

RHSA-2026:14215

RHSA-2026:14216

SUSE-SU-2026:1394-1

SUSE-SU-2026:21224-1

USN-8170-1

Affected Products

Corosync

Linuxmint

Rocky Linux

Ubuntu

References · 67

• 🔥 https://bugzilla.redhat.com/show_bug.cgi?id=2453169 · Exploit
• https://access.redhat.com/errata/RHSA-2026:13657 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:13673 · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2026-13657.html · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-35091 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:14215 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8170-1 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-1965 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-35092 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:13644 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2046 · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:13657 · Vendor Advisory
• https://errata.almalinux.org/9/ALSA-2026-13673.html · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-35092 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:14205 · Vendor Advisory