# CVE-2021-47160: linux: In the Linux kernel, the following vulnerability has been resolved:  net: dsa: mt7530: fix VLAN traffic leaks  PCR_MA...

CVE-2021-47160 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47160, released March 25, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-47160
- Priority: High
- CVSS: 7.1 (high)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2024

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47160](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47160.md) | Mar 25, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47160](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47160.md) | Mar 25, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47160](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47160.md) | Mar 25, 2024 |

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