{"id":"CVE-2026-87799","published":"2026-09-28T14:17:21.427","lastModified":"2026-09-29T04:18:01.037","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.","cvssScore":9.9,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-59"],"vendors":[],"products":[],"references":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-fmc3-3cpq-6whr","tags":[]}],"exploitRefs":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-fmc3-3cpq-6whr","tags":[]}],"hasPoc":true,"ai":{"summary":"This vulnerability allows an authenticated client 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.","exploitability":"Exploitation requires an authenticated client or a malicious migration source server. The attacker must create instances or custom storage volumes in a project and use a crafted rsync or btrfs send stream.","blast_radius":"If exploited, the attacker can gain full control over the target host, potentially leading to data loss, system compromise, and unauthorized access.","remediation":"Upgrade to LXD 4.0.14, 5.0.10, 5.21.8, or 6.10 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","auth-bypass","migration","root-compromise"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-29T08:50:15.401Z"}}