23 Oct 2026 15:48:27 UTC
Arbitrary file write on LXD host via symlink in migration stream
cve-program · CVE-2026-87799 · Published
CVE-2026-87799
Arbitrary file write on LXD host via symlink in migration stream
CVSS 3.1 9.9 CRITICALCheck source for fixed versionsKEV status unknown
Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.
cve-program · CVE-2026-87799
PublishedImproper 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.
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