8.1

CVE-2021-47160: net: dsa: mt7530: fix VLAN traffic leaks

Modified
AliasesUBUNTU-CVE-2021-47160DEBIAN-CVE-2021-47160
Published 25-03-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-47160 is a high (CVSS 8.1) vulnerability in linux. EPSS estimates a 0.33% chance of exploitation in the next 30 days, higher than 26.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.1, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.33%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1

Timeline

  1. 25-03-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.33%

Chance of exploitation in the next 30 days

Percentile

27%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.33% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: adjacent network, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu82 products
  • linux< 5.4.0-80.90
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1054.57
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 83163f7dca5684816d01c8ccf4857aa74801e7b7, < ae389812733b1b1e8e07fcc238e41db166b5c78d | ≥ 83163f7dca5684816d01c8ccf4857aa74801e7b7, < 4fe4e1f48ba119bdbc7c897c83b04ba0d08f5488 | ≥ 83163f7dca5684816d01c8ccf4857aa74801e7b7, < b91117b66fe875723a4e79ec6263526fffdb44d2 | ≥ 83163f7dca5684816d01c8ccf4857aa74801e7b7, < 82ae35b6c14feae5f216913d5b433e143c756d4e | ≥ 83163f7dca5684816d01c8ccf4857aa74801e7b7, < 474a2ddaa192777522a7499784f1d60691cd831a | 4.16
  • linux_kernel≥ 4.16, < 4.19.193 | ≥ 4.20, < 5.4.124 | ≥ 5.5, < 5.10.42 | ≥ 5.11, < 5.12.9 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3
Debian1 product
  • linux< 5.14.6-1

3 vendors · 85 products

References

8 links