#VU125587 Improper access control in lxd - CVE-2026-34177

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Main Vulnerability Database Vulnerabilities #VU125587

#VU125587 Improper access control in lxd - CVE-2026-34177

Published: April 9, 2026


Vulnerability identifier: #VU125587
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-34177
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vulnerable software:
lxd
Software vendor:
Linux Containers

Description

The vulnerability allows a remote user to escalate privileges to host root.

The vulnerability exists due to improper access control in isVMLowLevelOptionForbidden in lxd/project/limits/permissions.go when validating VM low-level configuration keys in a restricted project. A remote privileged user can set the raw.apparmor and raw.qemu.conf options on a VM instance to escalate privileges to host root.

Exploitation requires a restricted project with restricted.virtual-machines.lowlevel=block and permission to edit and start a VM instance.


Remediation

Install security update from vendor's website.

External links