by Kastro CVE-2026-87799
Canonical LXD — Arbitrary file write on LXD host via symlink in migration stream
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
LXD4.0.0 – < 4.0.144.0.14CNA
LXD5.0.0 – < 5.0.105.0.10CNA
LXD5.21.0 – < 5.21.85.21.8CNA
LXD6.0 – < 6.106.10CNA
Scores by source
canonical (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total