CVE-2026-87799GHSA-FMC3-3CPQ-6WHR
Arbitrary file write on LXD host via symlink in migration stream
- Published
- Last modified
- Status
- published
- Known exploitation
- Not listed in CISA KEV
- Fix
- Fixed in 4.0.14, 5.0.10, 5.21.8, 6.10
- Public exploit
- None on Exploit-DB
CISA SSVC
- Exploitation: none
- Automatable: no
- Technical impact: total
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Decision points from CISA's Vulnrichment, assessed (SSVC 2.0.3).
SSVC documentationSummary
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 versions
- LXD
From 4.0.0 · fixed in 4.0.14; From 5.0.0 · fixed in 5.0.10; From 5.21.0 · fixed in 5.21.8; From 6.0 · fixed in 6.10