CVE-2026-85185

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Source
https://cve.org/CVERecord?id=CVE-2026-85185
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85185.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-85185
Aliases
  • GHSA-27q7-qwhm-c34p
Downstream
Published
2026-09-28T13:21:51Z
Modified
2026-09-30T03:47:27Z
Severity
  • 9.6 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H CVSS Calculator
Summary
Path traversal in LXD btrfs storage driver allows arbitrary file deletion and write on host as root
Details

Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source.

Database specific 
{
    "cna_assigner":  "canonical",
    "cwe_ids":  [
        "CWE-22"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85185.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "introduced":  "6.0"
                },
                {
                    "fixed":  "6.10"
                }
            ],
            "source":  "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/canonical/lxd

Affected ranges

Type
GIT
Repo
https://github.com/canonical/lxd
Events
Introduced
2d1c49501c77c54fbdec3154b38736b6ba114501
Fixed
b6e6806eef1ffb9be88d80af840f82d762ba1e38
Introduced
1e1349e3cbf30c1b2ce74e531d4dd0fd52c45be1
Fixed
6dbdad8c58bbabc680340c61d238255cccece068
Introduced
761d134ceabd306f57acfb0ca51f59b03751a5b0
Fixed
a60b9e26b2e4b8a3353e29d8be45eb623ad16ead
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "4.0.2"
        },
        {
            "fixed":  "4.0.14"
        },
        {
            "introduced":  "5.0.0"
        },
        {
            "fixed":  "5.0.10"
        },
        {
            "introduced":  "5.21.0"
        },
        {
            "fixed":  "5.21.8"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

lxd-4.*
lxd-4.0.11
lxd-4.0.12
lxd-4.0.13
lxd-4.0.2
lxd-4.0.3
lxd-4.0.4
lxd-4.0.5
lxd-4.0.6
lxd-4.0.7
lxd-4.0.8
lxd-4.0.9
lxd-5.*
lxd-5.0.0
lxd-5.0.1
lxd-5.0.2
lxd-5.0.7
lxd-5.0.8
lxd-5.0.9
lxd-5.1
lxd-5.10
lxd-5.11
lxd-5.12
lxd-5.13
lxd-5.14
lxd-5.15
lxd-5.16
lxd-5.17
lxd-5.2
lxd-5.21.5
lxd-5.21.6
lxd-5.21.7
lxd-5.3
lxd-5.4
lxd-5.5
lxd-5.6
lxd-5.7
lxd-5.8
lxd-5.9
Other
show

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-85185.json"