CVE-2026-9539
MEDIUM EPSS 1.3%
Published Jun 24, 20266d ago · Modified Jun 24, 20266d ago
6.5 CVSS 3.1
Published Jun 24, 2026 6d ago
Last Modified Jun 24, 2026 6d ago
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).
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Changed
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
1.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-125 Out-of-bounds Read Memory Safety
References 3
- gitlab.freedesktop.org https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84
- gitlab.freedesktop.org https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2
- gitlab.freedesktop.org https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.