USN-8550-1

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Source
https://ubuntu.com/security/notices/USN-8550-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8550-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8550-1
Upstream
Related
Published
2026-07-15T13:59:22Z
Modified
2026-07-15T20:00:54Z
Summary
libslirp vulnerability
Details

It was discovered that libslirp incorrectly handled TCP urgent data. A privileged attacker inside a guest VM could possibly use this issue to obtain sensitive information from the host process memory.

References

Affected packages

Ubuntu:22.04:LTS / libslirp

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.6.1-1ubuntu0.2

Affected versions

4.*
4.4.0-1build1
4.6.1-1
4.6.1-1build1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.6.1-1ubuntu0.2"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-9539",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8550-1.json"

Ubuntu:24.04:LTS / libslirp

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.7.0-1ubuntu3.1

Affected versions

4.*
4.7.0-1ubuntu1
4.7.0-1ubuntu2
4.7.0-1ubuntu3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.7.0-1ubuntu3.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-9539",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8550-1.json"

Ubuntu:26.04:LTS / libslirp

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
4.9.1-1ubuntu1.1

Affected versions

4.*
4.8.0-1ubuntu1
4.9.1-1ubuntu1

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.9.1-1ubuntu1.1"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-9539",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8550-1.json"