CVE-2025-37863: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: ovl: don't allow datadir only In theory overlayfs could support upper layer directly referring to a data layer, but there's no current use case for this. Originally, when data-only layers were introduced, this wasn't allowed, only introduced by the "datadir+" feature, but without actually handling this case, resulting in an Oops. Fix by disallowing datadir without lowerdir.

Affected products

• Linux Linux Kernel: from 6.6.23, before 6.6.88 (fixed in 6.6.88); from 6.7, before 6.12.25 (fixed in 6.12.25); from 6.13, before 6.14.4 (fixed in 6.14.4); version 6.15 only

Published 2025-05-09. Last modified 2026-06-17.