NULL pointer dereference in Linuxcontainers Incus
CVE-2026-40195
Incus is a system container and virtual machine manager. In versions before 7.0.0, missing validation logic in the storage bucket import logic allows an authenticated user with access to the storage bucket feature to cause the Incus daemon to crash. The vulnerability is present in the backup metadata handling logic, where the daemon processes the index.yaml file from an imported archive and accesses members of the parsed backup configuration without first verifying that the configuration object was initialized. A malicious or malformed index.yaml that omits the config block causes a nil-pointer dereference during bucket import operations and terminates the daemon. Repeated use of this issue can be used to keep Incus offline, causing a denial of service. This issue is fixed in version 7.0.0.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (36.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Linuxcontainers Incus
- Lxc Incus — versions < 7.0.0
Weakness classification (CWE)
References
- github.com/lxc/incus/security/advisories/GHSA-gc7j-g665-rxr9 (Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-40195?
- CVE-2026-40195 is a medium-severity vulnerability in Linuxcontainers Incus, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-05-06.
- How severe is CVE-2026-40195?
- Medium severity. CVSS v3 base score is 6.5 out of 10.