Description
Improper link resolution in the migration receive path in Canonical LXD versions 4.0 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client that can create instances or custom storage volumes in a project, or a malicious migration source server, to write attacker-controlled files to arbitrary paths on the target host as root, leading to full host compromise. The attacker does this with a crafted rsync or btrfs send stream that plants a symlink in the transferred volume, such as rootfs or root.img, and then writes through it.
Published: 2026-09-28
Score: 9.9 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

Vendor Solution

Upgrade to LXD versions 4.0.14, 5.0.10, 5.21.8, 6.10 or later.

Tracking

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Advisories

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History

Mon, 28 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 28 Sep 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Canonical
Canonical lxd
Vendors & Products Canonical
Canonical lxd

Mon, 28 Sep 2026 13:30:00 +0000

Type Values Removed Values Added
Description Improper link resolution in the migration receive path in Canonical LXD versions 4.0 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client that can create instances or custom storage volumes in a project, or a malicious migration source server, to write attacker-controlled files to arbitrary paths on the target host as root, leading to full host compromise. The attacker does this with a crafted rsync or btrfs send stream that plants a symlink in the transferred volume, such as rootfs or root.img, and then writes through it.
Title Arbitrary file write on LXD host via symlink in migration stream
Weaknesses CWE-59
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: canonical

Published:

Updated: 2026-09-28T16:32:28.274Z

Reserved: 2026-09-09T10:00:46.383Z

Link: CVE-2026-87799

cve-icon Vulnrichment

Updated: 2026-09-28T16:22:29.745Z

cve-icon NVD

Status : Deferred

Published: 2026-09-28T14:17:21.427

Modified: 2026-09-28T17:17:51.787

Link: CVE-2026-87799

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T15:30:02Z

Weaknesses
  • CWE-59

    Improper Link Resolution Before File Access ('Link Following')