What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-09 · updated 2026-10-26
• Weakness: CWE-184

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.

Affected products

• Canonical LXD: from 4.12 through 5.0.6; from 5.21.0 through 5.21.4; from 6.0 through 6.7

References

• https://github.com/canonical/lxd/pull/17909
• https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f
• https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f

Get alerted when CVE-2026-34177 or the next vulnerability affects your stack