CVE-2026-115377: Improper Link Resolution Before File Access ('Link Following') in lxc incus
Description
CVE-2026-115377 is a critical arbitrary file write vulnerability in the Incus container management software (lxc). It affects versions before 6.0.7, versions from 6.1.0 up to but not including 7.0.2, and versions from 7.1.0 up to but not including 7.5.0. The flaw allows malicious migration sources to write files on the host system by planting symbolic links in transferred volumes during migration. This can lead to full host compromise if exploited.
CVSS v4.0
Score 9.4critical
Affected software
lxc
incus
pkg:github/lxc/incusRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Incus versions prior to 6.0.7, between 6.1.0 and 7.0.2, and between 7.1.0 and 7.5.0 contain an arbitrary file write vulnerability due to improper link resolution before file access (link following). Attackers can craft rsync or btrfs receive streams containing symbolic links such as 'rootfs' pointing to the host root filesystem. When these streams are processed during container migration, files can be written as root on the host, enabling full host compromise.
Potential Impact
Successful exploitation allows an attacker controlling a migration source to write arbitrary files on the host system with root privileges. This can lead to complete host compromise, including unauthorized code execution and system takeover.
Mitigation Recommendations
A fix is available in Incus versions 6.0.7, 7.0.2, and 7.5.0 and later. Users should upgrade to these or newer versions to remediate the vulnerability. No additional mitigation steps are indicated in the provided data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-22T11:24:28.627Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ada64a24d27ba8daa755e74
Added to database: 10/22/2026, 19:31:46 UTC
Last enriched: 10/22/2026, 20:30:23 UTC
Last updated: 10/22/2026, 21:35:17 UTC
Views: 5
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