libslirp TCP URG OOB Read Information Leak_CVE-2026-9539

6.5 / 10

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

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).

Basic Information

ID CVE-2026-9539

Source STAR_Labs

Published Jun 24, 2026 at 04:37

Affected Product

Vendor freedesktop.org

Product libslirp

Affected Versions freedesktop.org libslirp 0

CWE Classification

CWE-125

References

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    "published": "2026-06-24T04:37:01.955Z",
    "modified": "2026-06-24T04:37:01.955Z",
    "type": "cve",
    "title": "libslirp TCP URG OOB Read Information Leak",
    "source": "STAR_Labs",
    "references": "https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93\nhttps://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84\nhttps://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2",
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