CVE-2026-85185Public exploitNetwork attack vectorHinoki check available

Host file deletion via unvalidated btrfs subvolume path

Published Sep 28, 2026 · Updated Sep 28, 2026

Path traversal in Canonical LXD's btrfs storage driver allows remote authenticated users to delete arbitrary host files via backup or migration data. The driver accepts a subvolume path from an optimized backup header or migration header and joins it to a storage path without confining traversal before root-run file operations. Instance-creation permission and a btrfs storage pool are required; placing attacker-controlled content outside the pool additionally requires the host root filesystem to be btrfs.

CVSS severity9.6
Critical
EPSS probability0.36%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in Canonical LXD's btrfs storage driver allows remote authenticated users to delete arbitrary host files via backup or migration data. The driver accepts a subvolume path from an optimized backup header or migration header and joins it to a storage path without confining traversal before root-run file operations. Instance-creation permission and a btrfs storage pool are required; placing attacker-controlled content outside the pool additionally requires the host root filesystem to be btrfs.

The record

CVE
CVE-2026-85185
Published
Sep 28, 2026
Updated
Sep 28, 2026
Vendor
Canonical Ltd.
Product
LXD
Classifications
CWE-22, CWE-23, CAPEC-126, T1485
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.2 <4.0.14
  2. Affected versionversion=5.0.0 <5.0.10
  3. Affected versionversion=5.21.0 <5.21.8
  4. Affected versionversion=6.0 <6.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Canonical Ltd. · LXDversion=4.0.2 <4.0.14; version=5.0.0 <5.0.10; version=5.21.0 <5.21.8; version=6.0 <6.10

Published CVSS scores

9.6Canonical CNACVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-23Relative Path Traversal
CAPEC-126Path Traversal
T1485Data Destruction

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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