5.5

CVE-2021-47560: mlxsw: spectrum: Protect driver from buggy firmware

Analyzed
AliasesUBUNTU-CVE-2021-47560DEBIAN-CVE-2021-47560
Published 24-05-2024Last modified 11-05-2026

Vulnerability summary

CVE-2021-47560 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.22%
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 11 · Related 5
RHSA-2023:2148RHSA-2023:2458RHSA-2024:7000RHSA-2024:7001RHSA-2024:8107RHSA-2024:8161

Timeline

  1. 24-05-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum: Protect driver from buggy firmware When processing port up/down events generated by the device's firmware, the driver protects itself from events reported for non-existent local ports, but not the CPU port (local port 0), which exists, but lacks a netdev. This can result in a NULL pointer dereference when calling netif_carrier_{on,off}(). Fix this by bailing early when processing an event reported for the CPU port. Problem was only observed when running on top of a buggy emulator.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

13%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.22% 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

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu86 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 28b1987ef5064dd5c43538ba1168ef7b801f3cad, < 90d0736876c50ecde1a3275636a06b9ddb1cace9 | ≥ 28b1987ef5064dd5c43538ba1168ef7b801f3cad, < da4d70199e5d82da664a80077508d6c18f5e76df | ≥ 28b1987ef5064dd5c43538ba1168ef7b801f3cad, < 63b08b1f6834bbb0b4f7783bf63b80c8c8e9a047 | 5.4
  • linux_kernel≥ 5.4, < 5.10.83 | ≥ 5.11, < 5.15.6 | 5.16:rc1 | 5.16:rc2
Debian1 product
  • linux< 5.15.15-1

3 vendors · 89 products

References

7 links