UBUNTU-CVE-2026-9539

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Source

https://ubuntu.com/security/CVE-2026-9539

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9539.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-9539

Upstream

CVE-2026-9539

Published

2026-06-24T05:17:00Z

Modified

2026-06-25T17:12:16Z

Severity

6.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

An out-of-bounds heap read and integer underflow in the TCP urgent data handling (sosendoob) in freedesktop.org libslirp version before v4.9.2 on hypervisor host environments (e.g., QEMU) allows a privileged guest VM attacker (root or CAPNETRAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).

References

Affected packages

Ubuntu:20.04:LTS / libslirp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.0.0-1

4.0.0-2

4.1.0-1

4.1.0-2

4.1.0-2ubuntu1

4.1.0-2ubuntu2

4.1.0-2ubuntu2.1

4.1.0-2ubuntu2.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.1.0-2ubuntu2.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9539.json"

Ubuntu:22.04:LTS / libslirp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.4.0-1build1

4.6.1-1

4.6.1-1build1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.6.1-1build1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9539.json"

Ubuntu:24.04:LTS / libslirp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.7.0-1ubuntu1

4.7.0-1ubuntu2

4.7.0-1ubuntu3

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.7.0-1ubuntu3"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9539.json"

Ubuntu:25.10 / libslirp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.8.0-1ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.8.0-1ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9539.json"

Ubuntu:26.04:LTS / libslirp

Package

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

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Affected versions

4.*

4.8.0-1ubuntu1

4.9.1-1ubuntu1

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "libslirp0",
            "binary_version": "4.9.1-1ubuntu1"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-9539.json"