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This bulletin was written by Vigil@nce : https://vigilance.fr/?langue=2

SYNTHESIS OF THE VULNERABILITY

– Impacted products: Debian, Fedora, Linux, Ubuntu.
– Severity: 2/4.
– Consequences: data reading.
– Provenance: internet client.
– Confidence: confirmed by the editor (5/5).
– Creation date: 27/01/2021.

DESCRIPTION OF THE VULNERABILITY

An attacker can traverse directories via fs/nfsd/nfs3xdr.c of the
Linux kernel, in order to read a file outside the service root
path.

ACCESS TO THE FULL VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/Linux-kernel-directory-traversal-via-fs-nfsd-nfs3xdr-c-34415