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SYNTHESIS OF THE VULNERABILITY

A local attacker can manipulate directories on an XFS filesystem
with the Linux kernel, in order to trigger a denial of service.

– Impacted products: Linux
– Severity: 1/4
– Creation date: 14/10/2014

DESCRIPTION OF THE VULNERABILITY

The Linux kernel supports XFS filesystems.

This file system uses a tree to store access paths to files. This
tree uses a hash to identify paths in an optimized way. However,
by creating numerous directories, a local attacker can create a
hash collision, which triggers a fatal error in
xfs_da3_fixhashpath().

A local attacker can therefore manipulate directories on an XFS
filesystem with the Linux kernel, in order to trigger a denial of
service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-denial-of-service-via-xfs-da3-fixhashpath-15470