CVE-2025-5351

Publication date 25 June 2025

Last updated 10 July 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

4.2 · Medium

Score breakdown

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

Parameter Value
Base score 4.2 · Medium
Attack vector Network
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

References

Related Ubuntu Security Notices (USN)

Other references