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).
References (3)
Core 3
Core References
Issue Tracking issue-tracking
https://gitlab.freedesktop.org/slirp/libslirp/-/work_items/93
Patch patch
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/927bca7344e31fd58e2f7afaca784aad4400eb84
Release Notes release-notes
https://gitlab.freedesktop.org/slirp/libslirp/-/releases/v4.9.2
Scores
CVSS v3
6.5
EPSS
0.0011
EPSS Percentile
1.3%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (1)
freedesktop.org/libslirp
< 4.9.2
Published
Jun 24, 2026
Tracked Since
Jun 24, 2026