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CVE-2026-34177— VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf

Quick assessment

Affected
Canonical lxd
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LXD是Canonical开源的一款基于Linux系统用于管理应用程序的容器。 LXD 4.12至6.7版本存在安全漏洞，该漏洞源于拒绝列表不完整，可能导致权限提升。

CVSS 9.1 · Critical EPSS 0.61% · P47
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I. Basic Information for CVE-2026-34177

Vulnerability Information
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Vulnerability Title
VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
LXD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LXD是Canonical开源的一款基于Linux系统用于管理应用程序的容器。 LXD 4.12至6.7版本存在安全漏洞，该漏洞源于拒绝列表不完整，可能导致权限提升。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical lxd 4.12.0 ~ 5.0.7 -

II. Public POCs for CVE-2026-34177

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9274 chars
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III. Intelligence Information for CVE-2026-34177

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Vendor Advisories for CVE-2026-34177 (1)

Same Patch Batch · Canonical · 2026-04-09 · 5 CVEs total

CVE-2026-34178 9.1 CRITICAL Importing a crafted backup leads to project restriction bypass
CVE-2026-34179 9.1 CRITICAL Update of type field in restricted TLS certificate allows privilege escalation to cluster
CVE-2025-15480 Senstive information disclosure was affecting ubuntu-desktop-provision
CVE-2025-14551 Senstive information disclosure was affecting subiquity

IV. Related Vulnerabilities

Same product: lxd
Same vendor: Canonical
Same weakness: CWE-184

V. Comments for CVE-2026-34177

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