PT-2026-29516 · Corosync+3 · Corosync+3

Sebasteuo / 0Xs4Bb1 + 1 · Published 2026-04-01 · Updated 2026-05-26 · CVE-2026-35091

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

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

Description A flaw exists in Corosync where a remote, unauthenticated attacker can exploit a wrong return value vulnerability in the membership commit token sanity check. This is achieved by sending a specially crafted User Datagram Protocol (UDP) packet. Successful exploitation can lead to an out-of-bounds read, resulting in a denial of service (DoS) and potential disclosure of limited memory contents. This vulnerability affects Corosync when operating in totemudp/totemudpu mode, which is the default configuration.

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

Exploit

DoS

Weakness Enumeration

CWE-253

Related Identifiers

ALSA-2026:13644

ALSA-2026:13657

ALSA-2026:13673

CVE-2026-35091

OESA-2026-1964

OESA-2026-1965

OESA-2026-1966

OESA-2026-2046

OESA-2026-2047

OPENSUSE-SU-2026:10488-1

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

RHSA-2026:19043

RHSA-2026:19200

RHSA-2026:20916

SUSE-SU-2026:1394-1

SUSE-SU-2026:21224-1

USN-8170-1

Affected Products

Corosync

Linuxmint

Rocky Linux

Ubuntu

References · 70

• 🔥 https://bugzilla.redhat.com/show_bug.cgi?id=2453169 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-35091 · Vendor Advisory
• https://errata.rockylinux.org/RLSA-2026:13657 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:13673 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10488-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:20916 · Vendor Advisory
• https://osv.dev/vulnerability/USN-8170-1 · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2026-13657.html · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:14214 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-13673.html · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8170-1 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:14210 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:20505-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-35092 · Security Note
• https://access.redhat.com/errata/RHSA-2026:13657 · Vendor Advisory