CVE-2025-5351
Publication date 25 June 2025
Last updated 9 January 2026
Ubuntu priority
Medium
Description
A flaw was found in the key export functionality of libssh. The issue occurs in the internal function responsible for converting cryptographic keys into serialized formats. During error handling, a memory structure is freed but not cleared, leading to a potential double free issue if an additional failure occurs later in the function. This condition may result in heap corruption or application instability in low-memory scenarios, posing a risk to system reliability where key export operations are performed.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| libssh | 25.04 plucky |
Fixed 0.11.1-1ubuntu0.1
|
| 24.10 oracular |
Fixed 0.10.6-3ubuntu1.1
|
|
| 24.04 LTS noble |
Fixed 0.10.6-2ubuntu0.1
|
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
Patch details
For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?
| Package | Patch details |
|---|---|
| libssh |
|
Severity score breakdown
CVSS version: CVSS v3.0
Base score 6.5 · Medium
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-7619-1
- libssh vulnerabilities
- 7 July 2025