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CVE

CVE-2026-85526

Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD
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CVE

CVE-2026-85526

Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD

Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
C
H
U
9.9
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/85xxx/CVE-2026-85526.json, https://nvd.nist.gov/vuln/detail/CVE-2026-85526, https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv, https://github.com/canonical/lxd-private/pull/103, https://github.com/canonical/lxd-private/pull/104, https://github.com/canonical/lxd-private/pull/105, https://github.com/canonical/lxd-private/pull/84, https://github.com/canonical/lxd-private/pull/87, https://github.com/canonical/lxd

Severity

9.9

CVSS Score
0
10

Basic Information

Base CVSS
9.9
EPSS Probability
0.00528%
EPSS Percentile
0.4439%
Introduced Version
0,v7.0.0,v7.0.0-20260501231825-40dd4f151d52,v7.1.0,v6.0.1,v6.0.1-0.20240405150957-bf519f9ab21a,v6.1.0,v0.1.0,v0.0.0-20230930034430-d33cb2388a78,v0.0.0-20230809055229-78cea072e604,v0.0.0-20230809075127-2e8b9188b699,v0.0.0-20230809033550-59f049aad8e8,v0.0.0-20230809062453-f617895f465f,v0.0.0-20230731212712-ab0295afdd26,v0.0.0-20230731212529-7673a78986e4,v0.0.0-20230704205107-bfa9fa7c9331,v0.0.0-20200514111047-84bca19eeeb3
Fix Available
3c94d4fae7ff57e0ee79850135a277f53a18753c,v7.5.0,v7.0.2-0.20260925005553-99a8ba3101e9,v7.4.1-0.20260924224852-058a268a58cd,v6.0.7-0.20260925034327-4780dc5c6ec0,6.0.4-2+deb13u1

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