CVE-2023-2640: Canonical Ubuntu Linux

High severity, CVSS 7.8. EPSS: 15.2% chance of exploitation in the next 30 days.

On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.

Affected products

Published 2023-07-26. Last modified 2026-06-17.