UBUNTU-CVE-2026-94453

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Source
https://ubuntu.com/security/CVE-2026-94453
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-94453
Upstream
  • CVE-2026-94453
Published
2026-10-13T22:19:00Z
Modified
2026-10-17T13:01:18Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Libreswan's pluto daemon has a use-after-free vulnerability when a client connecting using IKE over TCP closes the connection and another packet (retransmit or malicious) is received for the same tuple. IKE state is retained in memory after the client closes the connection, storing a pointer to iface_endpoint inside ike_sa.sa->st_iface_endpoint. Once this invalid pointer is used, the daemon crashes and restarts. This vulnerability can be triggered before the remote peer has authenticated itself. Continued exploitation can lead to a denial of service. Remote code execution could be possible. The IKE over TCP option is not enabled by default; only configurations that contain listen-tcp=yes are affected.

References

Affected packages

Ubuntu:18.04:LTS
libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.20-7build1
3.21-2
3.22-1
3.22-2
3.22-3
3.22-4
3.23-1
3.23-4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libreswan",
            "binary_version":  "3.23-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json"
Ubuntu:20.04:LTS
libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.29-2
3.29-2build1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libreswan",
            "binary_version":  "3.29-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json"
Ubuntu:22.04:LTS
libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.32-3ubuntu3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libreswan",
            "binary_version":  "3.32-3ubuntu3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json"
Ubuntu:24.04:LTS
libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

4.*
4.11-1ubuntu1
4.12-1ubuntu1
4.14-1ubuntu1
4.14-1ubuntu2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libreswan",
            "binary_version":  "4.14-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json"
Ubuntu:26.04:LTS
libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.2-2.2ubuntu1
5.2-2.2ubuntu2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libreswan",
            "binary_version":  "5.2-2.2ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json"
Ubuntu:26.10
libreswan

Package

Name
libreswan
Purl
pkg:deb/ubuntu/libreswan?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.2-2.2ubuntu2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "libreswan",
            "binary_version":  "5.2-2.2ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-94453.json"