Nil-Pointer Dereference CreateCustomVolumeFromBackup in LXD <6.8 / 5.21 (DoS)
CVE-2026-9639 Published on June 26, 2026
Authenticated Denial of Service via Malicious Backup Tarball in LXD
Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an authenticated user with can_create_storage_volumes permissions to cause a denial of service via a specially crafted custom-volume backup tarball that omits the expires_at snapshot field.
Vulnerability Analysis
CVE-2026-9639 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-9639. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
NULL Pointer Dereference
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. NULL pointer dereference issues can occur through a number of flaws, including race conditions, and simple programming omissions.
Products Associated with CVE-2026-9639
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Affected Versions
Canonical LXD:- Version 5.21.0 and below 5.21.5 is affected.
- Version 6.0 and below 6.9 is affected.