CVE-2021-47160 Information

Description

In the Linux kernel the following vulnerability has been resolved:

net: dsa: mt7530: fix VLAN traffic leaks

PCR_MATRIX field was set to all 1’s when VLAN filtering is enabled but was not reset when it is disabled which may cause traffic leaks:

ip link add br0 type bridge vlan_filtering 1
ip link add br1 type bridge vlan_filtering 1
ip link set swp0 master br0
ip link set swp1 master br1
ip link set br0 type bridge vlan_filtering 0
ip link set br1 type bridge vlan_filtering 0
 traffic in br0 and br1 will start leaking to each other

As port_bridge_adddel have set up PCR_MATRIX properly remove the PCR_MATRIX write from mt7530_port_set_vlan_aware.

Reference

https://git.kernel.org/stable/c/ae389812733b1b1e8e07fcc238e41db166b5c78d https://git.kernel.org/stable/c/4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488 https://git.kernel.org/stable/c/b91117b66fe875723a4e79ec6263526fffdb44d2 https://git.kernel.org/stable/c/82ae35b6c14feae5f216913d5b433e143c756d4e https://git.kernel.org/stable/c/474a2ddaa192777522a7499784f1d60691cd831a