CVE request -- linux kernel: overlay: fix permission checking for setattr

[Vladis Dronov <vdronov () redhat com>]

Hello,
If possible, we would like to obtain a CVE-ID for the following security issue.
I was not able to find an already-assigned CVE-ID for this.

A flaw was found in the overlay filesystem of the Linux kernel which allows
an unprivileged user to change attributes of the files in the overlay,
particularly allowing access to root-only-accessible files like '/etc/shadow'.

References:

https://bugzilla.redhat.com/show_bug.cgi?id=1291329 - Red Hat public Bugzilla

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=acff81ec2c79492b180fade3c2894425cd35a545
- an upstream Linux kernel commit fixing the issue.

Best regards,
Vladis Dronov | Red Hat, Inc. | Product Security Engineer