CVE-2025-37863 Information

Description

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.

Reference

https://git.kernel.org/stable/c/0874b629f65320778e7e3e206177770666d9db18 https://git.kernel.org/stable/c/21d2ffb0e9838a175064c22f3a9de97d1f56f27d https://git.kernel.org/stable/c/b9e3579213ba648fa23f780e8d53e99011c62331 https://git.kernel.org/stable/c/eb3a04a8516ee9b5174379306f94279fc90424c4