Vulnerability CVE-2021-47160
Published: 2024-03-25

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_{add,del} have set up PCR_MATRIX properly, remove the
PCR_MATRIX write from mt7530_port_set_vlan_aware.

 References:
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
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