UBUNTU-CVE-2025-26466

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Source

https://ubuntu.com/security/CVE-2025-26466

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-26466.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-26466

Related

Published

2025-02-18T00:00:00Z

Modified

2025-03-05T05:26:16Z

Severity

5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

[none]

Details

A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.

References

Affected packages

Ubuntu:24.10 / openssh

Package

Name: openssh
Purl: pkg:deb/ubuntu/openssh@1:9.7p1-7ubuntu4.2?arch=source&distro=oracular

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:9.7p1-7ubuntu4.2

Affected versions

1:9.*

1:9.6p1-3ubuntu13

1:9.6p1-3ubuntu14

1:9.6p1-3ubuntu15

1:9.6p1-3ubuntu17

1:9.6p1-3ubuntu18

1:9.7p1-7ubuntu2

1:9.7p1-7ubuntu3

1:9.7p1-7ubuntu4

1:9.7p1-7ubuntu4.1

Ecosystem specific

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-client"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-client-dbgsym"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-server"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-server-dbgsym"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-sftp-server"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-sftp-server-dbgsym"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-tests"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "openssh-tests-dbgsym"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "ssh"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "ssh-askpass-gnome"
        },
        {
            "binary_version": "1:9.7p1-7ubuntu4.2",
            "binary_name": "ssh-askpass-gnome-dbgsym"
        }
    ]
}

Ubuntu:24.04:LTS / openssh

Package

Name: openssh
Purl: pkg:deb/ubuntu/openssh@1:9.6p1-3ubuntu13.8?arch=source&distro=noble

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:9.6p1-3ubuntu13.8

Affected versions

1:9.*

1:9.3p1-1ubuntu3

1:9.4p1-1ubuntu1

1:9.6p1-3ubuntu1

1:9.6p1-3ubuntu2

1:9.6p1-3ubuntu11

1:9.6p1-3ubuntu12

1:9.6p1-3ubuntu13

1:9.6p1-3ubuntu13.3

1:9.6p1-3ubuntu13.4

1:9.6p1-3ubuntu13.5

1:9.6p1-3ubuntu13.7

Ecosystem specific

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-client"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-client-dbgsym"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-server"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-server-dbgsym"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-sftp-server"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-sftp-server-dbgsym"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-tests"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "openssh-tests-dbgsym"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "ssh"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "ssh-askpass-gnome"
        },
        {
            "binary_version": "1:9.6p1-3ubuntu13.8",
            "binary_name": "ssh-askpass-gnome-dbgsym"
        }
    ]
}