Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-9639— Authenticated Denial of Service via Malicious Backup Tarball in LXD

Quick assessment

Affected
Canonical LXD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD存在异常处理不当漏洞，该漏洞源于在CreateCustomVolumeFromBackup中存在空指针取消引用问题，可能导致具有can_create_storage_volumes权限的已认证用户通过特制的自定义卷备份tarball（省略expires_at快照字段）造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
Canonical LXD 5.21.0< 5.21.5 affected
6.0< 6.9 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-9639

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Authenticated Denial of Service via Malicious Backup Tarball in LXD
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD存在异常处理不当漏洞，该漏洞源于在CreateCustomVolumeFromBackup中存在空指针取消引用问题，可能导致具有can_create_storage_volumes权限的已认证用户通过特制的自定义卷备份tarball（省略expires_at快照字段）造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical LXD 5.21.0 ~ 5.21.5 -

II. Public POCs for CVE-2026-9639

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-9639

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-9639 (2)

Vendor Advisories for CVE-2026-9639 (1)

Same Patch Batch · Canonical · 2026-06-26 · 4 CVEs total

CVE-2026-12411 8.4 HIGH Broken Access Control in Canonical LXD DevLXD API
CVE-2026-9640 7.2 HIGH LXD Snapshot Import Privilege Escalation Vulnerability
CVE-2026-28385 5.0 MEDIUM SSRF via image import from URL allows internal network probing by authenticated users

IV. Related Vulnerabilities

Same product: LXD
Same vendor: Canonical
Same weakness: CWE-476

V. Comments for CVE-2026-9639

No comments yet

Leave a comment