CVE-2026-9639 Details
Description
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.
A nil-pointer dereference vulnerability has been identified in LXD versions prior to 6.8 and 5.21, on Linux. This vulnerability allows an authenticated user with 'can_create_storage_volumes' permissions to cause a denial-of-service by uploading a custom-volume backup tarball that lacks the 'expires_at' snapshot field. The issue arises in the 'CreateCustomVolumeFromBackup' function, where the absence of this field leads to a segmentation violation, crashing the LXD daemon.
Users can update to LXD versions 5.21.5 or 6.9, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/canonical/lxd/security/advisories/GHSA-j93m-3j9p-m5m8 | CISA-ADP | ExploitPatchVendor Advisory |
| https://github.com/canonical/lxd/pull/18320 | [email protected] | Issue TrackingPatch |
| https://github.com/canonical/lxd/pull/18390 | [email protected] | Issue TrackingPatch |
| https://github.com/canonical/lxd/security/advisories/GHSA-j93m-3j9p-m5m8 | [email protected] | ExploitPatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| canonical lxd | >= 5.0.0, < 5.21.5 >= 6.0, < 6.9 |
CPE
Remediation
| |
| linux linux kernel | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 2, 2026 | Initial Analysis | [email protected] |
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | New CVE Received | [email protected] |