UBUNTU-CVE-2026-35091

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Source

https://ubuntu.com/security/CVE-2026-35091

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-35091

Upstream

CVE-2026-35091

Downstream

USN-8170-1

Related

USN-8170-1

Published

2026-04-01T14:16:00Z

Modified

2026-04-22T16:32:10.848702Z

Severity

8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A flaw was found in Corosync. A remote unauthenticated attacker can exploit a wrong return value vulnerability in the Corosync membership commit token sanity check by sending a specially crafted User Datagram Protocol (UDP) packet. This can lead to an out-of-bounds read, causing a denial of service (DoS) and potentially disclosing limited memory contents. This vulnerability affects Corosync when running in totemudp/totemudpu mode, which is the default configuration.

References

Affected packages

Ubuntu:16.04:LTS

corosync

Package

Name: corosync
Purl: pkg:deb/ubuntu/corosync@2.3.5-3ubuntu2.3?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.3.4-0ubuntu1

2.3.5-3

2.3.5-3ubuntu1

2.3.5-3ubuntu2

2.3.5-3ubuntu2.1

2.3.5-3ubuntu2.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "corosync"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "corosync-notifyd"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libcfg6"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libcmap4"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libcorosync-common4"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libcpg4"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libquorum5"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libsam4"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libtotem-pg5"
        },
        {
            "binary_version": "2.3.5-3ubuntu2.3",
            "binary_name": "libvotequorum7"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json"

Ubuntu:18.04:LTS

corosync

Package

Name: corosync
Purl: pkg:deb/ubuntu/corosync@2.4.3-0ubuntu1.3?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

2.*

2.4.2-3build1

2.4.2-3ubuntu1

2.4.3-0ubuntu1

2.4.3-0ubuntu1.1

2.4.3-0ubuntu1.2

2.4.3-0ubuntu1.3

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "corosync"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "corosync-notifyd"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "corosync-qdevice"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "corosync-qnetd"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libcfg6"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libcmap4"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libcorosync-common4"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libcpg4"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libquorum5"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libsam4"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libtotem-pg5"
        },
        {
            "binary_version": "2.4.3-0ubuntu1.3",
            "binary_name": "libvotequorum8"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json"

Ubuntu:20.04:LTS

corosync

Package

Name: corosync
Purl: pkg:deb/ubuntu/corosync@3.0.3-2ubuntu2.2?arch=source&distro=focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

3.*

3.0.1-2ubuntu1

3.0.2-1ubuntu1

3.0.2-1ubuntu2

3.0.3-2ubuntu1

3.0.3-2ubuntu2

3.0.3-2ubuntu2.1

3.0.3-2ubuntu2.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "corosync"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "corosync-notifyd"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "corosync-vqsim"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libcfg7"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libcmap4"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libcorosync-common4"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libcpg4"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libquorum5"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libsam4"
        },
        {
            "binary_version": "3.0.3-2ubuntu2.2",
            "binary_name": "libvotequorum8"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json"

Ubuntu:22.04:LTS

corosync

Package

Name: corosync
Purl: pkg:deb/ubuntu/corosync@3.1.6-1ubuntu1.2?arch=source&distro=jammy

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.1.6-1ubuntu1.2

Affected versions

3.*

3.1.2-2ubuntu1

3.1.6-1ubuntu1

3.1.6-1ubuntu1.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "corosync"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "corosync-notifyd"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "corosync-vqsim"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libcfg7"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libcmap4"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libcorosync-common4"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libcpg4"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libquorum5"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libsam4"
        },
        {
            "binary_version": "3.1.6-1ubuntu1.2",
            "binary_name": "libvotequorum8"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json"

Ubuntu:24.04:LTS

corosync

Package

Name: corosync
Purl: pkg:deb/ubuntu/corosync@3.1.7-1ubuntu3.2?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.1.7-1ubuntu3.2

Affected versions

3.*

3.1.7-1ubuntu1

3.1.7-1ubuntu2

3.1.7-1ubuntu3

3.1.7-1ubuntu3.1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "corosync"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "corosync-notifyd"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "corosync-vqsim"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libcfg7"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libcmap4"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libcorosync-common4"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libcpg4"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libquorum5"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libsam4"
        },
        {
            "binary_version": "3.1.7-1ubuntu3.2",
            "binary_name": "libvotequorum8"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json"

Ubuntu:25.10

corosync

Package

Name: corosync
Purl: pkg:deb/ubuntu/corosync@3.1.9-2ubuntu1.1?arch=source&distro=questing

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.1.9-2ubuntu1.1

Affected versions

3.*

3.1.8-3ubuntu2

3.1.9-2ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "corosync"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "corosync-notifyd"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "corosync-vqsim"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libcfg7"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libcmap4"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libcorosync-common4"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libcpg4"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libquorum5"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libsam4"
        },
        {
            "binary_version": "3.1.9-2ubuntu1.1",
            "binary_name": "libvotequorum8"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-35091.json"