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Published: 24 July 2023

A flaw was found in the 9p passthrough filesystem (9pfs) implementation in QEMU. When a local user in the guest writes an executable file with SUID or SGID, none of these privileged bits are correctly dropped. As a result, in rare circumstances, this flaw could be used by malicious users in the guest to elevate their privileges within the guest and help a host local user to elevate privileges on the host.


Priority reason:
Low severity issue, guest user could help host user escalate privileges
as of 2023-11-30, there is no upstream fix for this issue



Cvss 3 Severity Score


Score breakdown


Package Release Status
Launchpad, Ubuntu, Debian
upstream Needs triage

bionic Deferred
focal Deferred
jammy Deferred
kinetic Ignored
(end of life, was deferred [2023-11-30])
lunar Deferred
mantic Deferred
trusty Deferred
xenial Deferred

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H