CVE-2026-9639: CWE-476 NULL pointer dereference in Canonical 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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-9639) is a NULL pointer dereference in the CreateCustomVolumeFromBackup function of Canonical LXD on Linux. It affects LXD versions 5.21.0, 6.0, and all versions from 5.21.0 up to but not including 5.21.5, as well as versions 6.0 up to but not including 6.9. An authenticated user with the can_create_storage_volumes permission can cause a denial of service by providing a custom-volume backup tarball missing the expires_at snapshot field, which leads to a nil-pointer dereference. The CVSS 3.1 base score is 6.5, indicating a medium severity impact focused on availability disruption without confidentiality or integrity impact.
Potential Impact
An authenticated user with specific permissions can cause a denial of service condition in the LXD service by exploiting this vulnerability. There is no impact on confidentiality or integrity, but availability is affected due to the NULL pointer dereference causing a crash or service disruption.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict the can_create_storage_volumes permission to trusted users only to reduce risk.
CVE-2026-9639: CWE-476 NULL pointer dereference in Canonical LXD
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.
CVSS v3.1
Score 6.5medium
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-9639) is a NULL pointer dereference in the CreateCustomVolumeFromBackup function of Canonical LXD on Linux. It affects LXD versions 5.21.0, 6.0, and all versions from 5.21.0 up to but not including 5.21.5, as well as versions 6.0 up to but not including 6.9. An authenticated user with the can_create_storage_volumes permission can cause a denial of service by providing a custom-volume backup tarball missing the expires_at snapshot field, which leads to a nil-pointer dereference. The CVSS 3.1 base score is 6.5, indicating a medium severity impact focused on availability disruption without confidentiality or integrity impact.
Potential Impact
An authenticated user with specific permissions can cause a denial of service condition in the LXD service by exploiting this vulnerability. There is no impact on confidentiality or integrity, but availability is affected due to the NULL pointer dereference causing a crash or service disruption.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or temporary workaround is currently documented. Until a patch is available, restrict the can_create_storage_volumes permission to trusted users only to reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- canonical
- Date Reserved
- 2026-05-26T18:31:05.985Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a3ea39f6e08203f7db8ff9a
Added to database: 06/26/2026, 16:06:55 UTC
Last enriched: 06/26/2026, 16:22:14 UTC
Last updated: 06/26/2026, 16:52:23 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.