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CVE-2026-34177

VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf

Published: Apr 9, 2026Updated: Apr 22, 2026 Sources: CVE List NVD BDUCWE-184
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.4%
Top 72.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-184

Affected Products

lxdcanonical
On-prem
Operating Systems / linux-distro
lxdCanonical
On-prem
Operating Systems / linux-distro
Debian GNU/LinuxСообщество свободного программного обеспечения
On-premOS
Operating Systems / linux-distro
РЕД ОСООО «Ред Софт»
On-premOS
Operating Systems / linux-distro
UbuntuCanonical Ltd.
On-premOS
Operating Systems / linux-distro
canonicalcommercialGBOperating Systemsaka canonical ltd.
сообщество свободного программного обеспеченияoss-projectOperating Systemsaka сообщество свободного программного обеспечения, fsf
ооо «ред софт»commercialRUOperating Systemsaka red soft
canonical ltd.commercialGBOperating Systemsaka canonical
and 1 more affected products View all →

Exploitability

Official Patch Available

References

https://github.com/canonical/lxd/pull/17909
github.com
https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f
github.com
https://redos.red-soft.ru/search/?iblock_id=&q=CVE-2026-34177
redos.red-soft.ru
and 5 more references View all →

Timeline

Published
Apr 9, 2026
Last Updated
Apr 22, 2026

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