Vigil@nce - Linux kernel: denial of service via XFS overlayfs rename
July 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can use rename() on the Linux kernel with
overlayfs on XFS, in order to trigger a denial of service.
Impacted products: Linux.
Severity: 1/4.
Creation date: 12/07/2016.
DESCRIPTION OF THE VULNERABILITY
The Linux kernel supports overlayfs on an XFS filesystem.
However, if the rename() system call is used to rename a link on
overlayfs, a fatal error occurs.
A local attacker can therefore use rename() on the Linux kernel
with overlayfs on XFS, in order to trigger a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-XFS-overlayfs-rename-20065