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SYNTHESIS OF THE VULNERABILITY

A local privileged attacker can force an error in the
nft_flush_table() function of the Linux kernel, in order to
trigger a denial of service.

Impacted products: Linux, netfilter

Severity: 1/4

Creation date: 10/02/2015

DESCRIPTION OF THE VULNERABILITY

The Linux kernel uses the netfilter firewall, which uses tables
which can be flushed by users with the NET_CAP_ADMIN capability.

However, the nft_flush_table() function of the
net/netfilter/nf_tables_api.c file can be called to flush twice
the same table, which triggers a fatal error.

A local privileged attacker can therefore force an error in the
nft_flush_table() function of 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-nft-flush-table-16138