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Review reviewHigh

CVE-2021-47160

Linux Linux, linux kernel

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...

CVSS
7.1
EPSS
0.33%
25.5% percentile
CISA KEV
Not listed
Published
2024.03.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.33%
Technical severityCVSS 7.1

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 83163f7dca5684816d01c8ccf4857aa74801e7b7 < ae389812733b1b1e8e07fcc238e41db166b5c78d, >= 83163f7dca5684816d01c8ccf4857aa74801e7b7 < 4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488, >= 83163f7dca5684816d01c8ccf4857aa74801e7b7 < b91117b66fe875723a4e79ec6263526fffdb44d2, >= 83163f7dca5684816d01c8ccf4857aa74801e7b7 < 82ae35b6c14feae5f216913d5b433e143c756d4e, >= 83163f7dca5684816d01c8ccf4857aa74801e7b7 < 474a2ddaa192777522a7499784f1d60691cd831a, >= 4.16, >= 4.16 < 4.19.193, >= 4.20 < 5.4.124, >= 5.5 < 5.10.42, >= 5.11 < 5.12.9, 5.13
Fixed versions
4.19.193, 5.4.124, 5.10.42, 5.12.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
Not available