Stack-based buffer overflow in Xen - CVE-2026-102701
Published: October 13, 2026
Vulnerability identifier: #VU154192
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-102701
CWE-ID: CWE-121
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to potentially execute arbitrary code.
The vulnerability exists due to a stack-based buffer overflow in tap_ctl_connect_xenblkif() when negotiating multi-page rings between the frontend and backend. A local user can request a ring size exceeding the assumed limit of 8 to potentially execute arbitrary code.
Tapdisk normally runs as root.
Affected software
Xen
How to mitigate CVE-2026-102701
Install security update from vendor's website.