CVE-2025-26466
Publication date 18 February 2025
Last updated 18 February 2025
Ubuntu priority
The OpenSSH client and server are vulnerable to a pre-authentication denial-of-service attack: an asymmetric resource consumption of both memory and CPU. This vulnerability was introduced in August 2023 (shortly before OpenSSH 9.5p1) by commit dce6d80 ("Introduce a transport-level ping facility").
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| openssh | 24.10 oracular |
Fixed 1:9.7p1-7ubuntu4.2
|
| 24.04 LTS noble |
Fixed 1:9.6p1-3ubuntu13.8
|
|
| 22.04 LTS jammy FIPS Updates |
Not affected
|
|
| 20.04 LTS focal FIPS Updates |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| openssh-ssh1 | 24.10 oracular |
Not affected
|
| 24.04 LTS noble |
Not affected
|
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
Notes
mdeslaur
openssh-ssh1 is only provided for compatibility with old devices that cannot be upgraded to modern protocols. We will not be providing any security support for the openssh-ssh1 package as it is insecure and should be used in trusted environments only. introduced in 9.5p1
References
Related Ubuntu Security Notices (USN)
- USN-7270-1
- OpenSSH vulnerabilities
- 18 February 2025