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 CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).
History

Wed, 24 Jun 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Freedesktop.org
Freedesktop.org libslirp
Vendors & Products Freedesktop.org
Freedesktop.org libslirp

Wed, 24 Jun 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 24 Jun 2026 05:00:00 +0000

Type Values Removed Values Added
Description 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 CAP_NET_RAW) to leak gigabytes of sensitive host-process heap memory via sending crafted TCP segments with manipulated URG flags and urgent pointers (ti_urp).
Title libslirp TCP URG OOB Read Information Leak
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: STAR_Labs

Published: 2026-06-24T04:37:01.955Z

Updated: 2026-06-24T12:39:59.831Z

Reserved: 2026-05-26T02:36:53.227Z

Link: CVE-2026-9539

cve-icon Vulnrichment

Updated: 2026-06-24T12:39:56.720Z

cve-icon NVD

No data.

cve-icon Redhat

No data.