CVE-2026-9539 Details
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).
A vulnerability allowing an out-of-bounds heap read and integer underflow has been identified in freedesktop.org libslirp versions prior to v4.9.2. This issue occurs in hypervisor host environments, such as QEMU, and allows a privileged guest VM attacker (with root or CAP_NET_RAW) to leak large amounts of sensitive host-process heap memory. The vulnerability arises from improper handling of TCP urgent data, where crafted segments with manipulated URG flags and pointers can be used to exploit the memory management, leading to the exposure of gigabytes of data.
Users are advised to update to libslirp version v4.9.2 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 24, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-125 | Out-of-bounds Read | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 24, 2026 | CVE Modified | CISA-ADP |
| Jun 24, 2026 | New CVE Received | [email protected] |