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TI-2026-26474 Aliases CVE-2026-34177GHSA-fm2x-c5qw-4h6f

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

Priority HIGH 74CWE-184Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00369 30th percentileScored 2026-11-07
Fix Fixed lxd (Canonical): 5.0.7, 5.21.5, 6.8.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Canonicallxd4.12.0 to before 5.0.7; 5.1.0 to before 5.21.5; 6.0.0 to before 6.8.05.0.7, 5.21.5, 6.8.0Patch availableCNA
—github.com/canonical/lxd (Go)0.0.0-20210305023314-538ac3df036e – 0.0.0-20260226085519-736f34afb267—No fix listedGHSA-fm2x-c5qw-4h6f
  • lxd VendorCanonical Affected 4.12.0 to before 5.0.7; 5.1.0 to before 5.21.5; 6.0.0 to before 6.8.0 Fixed in 5.0.7, 5.21.5, 6.8.0 Patch available CNA
  • github.com/canonical/lxd (Go) Vendor— Affected 0.0.0-20210305023314-538ac3df036e – 0.0.0-20260226085519-736f34afb267 Fixed in — No fix listed GHSA-fm2x-c5qw-4h6f

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:*4.12 – 5.0.6; 5.21.0 – 5.21.4; 6.0 – 6.7VulnerableCanonical
  • cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:* Versions 4.12 – 5.0.6; 5.21.0 – 5.21.4; 6.0 – 6.7 Vulnerable ·Canonical

Remediation

  • Fix · CNA lxd (Canonical) Fixed in 5.0.7, 5.21.5, 6.8.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Canonical lxd 5.0.7, 5.21.5, 6.8.0

    3 records Highest priority Priority HIGH 3 HIGH

    Other records, highest priority first

    • TI-2026-26476 Update of type field in restricted TLS certificate allows privilege escalation to cluster adminPriority HIGH 74
    • TI-2026-26475 Importing a crafted backup leads to project restriction bypassPriority HIGH 74
    Show all 3 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34177
  2. 2026-10-03 Alias added: GHSA-fm2x-c5qw-4h6f

References

Patch 1

Advisory 2

Other 1

  • TI-2026-22659 Authenticated RCE via unsanitized compression_algorithm CVSS 4.0CRITICAL 9.4
  • TI-2026-47475 Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE CVSS 3.1CRITICAL 9.9
  • TI-2026-45146 Cross-project instance move bypasses all project restrictions allowing host command execution CVSS 3.1CRITICAL 9.9
  • TI-2026-45143 Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge CVSS 3.1CRITICAL 9.9
  • TI-2026-45142 Project restriction bypass via instance migration config override CVSS 3.1CRITICAL 9.9
  • TI-2026-45140 Root RCE via image backup.yaml symlink CVSS 3.1CRITICAL 9.9
See all 34 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences