What is CVE-2026-9639?

CVE-2026-9639 is a medium-severity vulnerability in Linux Linux_kernel, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-06-26.

How severe is CVE-2026-9639?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Linux Linux_kernel

CVE-2026-9639

Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an authenticated user with can_create_storage_volumes permissions to cause a denial of service via a specially crafted custom-volume…

EPSS: 0.004 (34.5th percentile) — read the EPSS interpretation.

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.

Affected products

Linux Linux_kernel
Canonical Lxd — versions 5.21.0, 6.0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

security@ubuntu.com (Exploit, vendor-advisory, Patch, vdb-entry, Vendor Advisory)
security@ubuntu.com (Patch, patch, Issue Tracking)
security@ubuntu.com (Patch, patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-9639?: CVE-2026-9639 is a medium-severity vulnerability in Linux Linux_kernel, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-06-26.
How severe is CVE-2026-9639?: Medium severity. CVSS v3 base score is 6.5 out of 10.