8.8

CVE-2021-47670: can: peak_usb: fix use after free bugs

Modified
AliasesUBUNTU-CVE-2021-47670DEBIAN-CVE-2021-47670
Published 17-04-2025Last modified 05-08-2026

Vulnerability summary

CVE-2021-47670 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 13% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 8.8, adjacent network); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
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 9 · Related 3
RHSA-2025:13589RHSA-2025:13590RHSA-2025:14136RHSA-2025:14511RHSA-2025:14692RHSA-2025:15035

Timeline

  1. 17-04-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: can: peak_usb: fix use after free bugs After calling peak_usb_netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the peak_usb_netif_rx_ni(). Reordering the lines solves the issue.

CVSS metrics

5 scores · 4 sources · 2 versions

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

Ubuntu96 products
  • linuxAll versions (No fix recorded) | < 4.15.0-141.145 | < 5.4.0-67.75
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 4.15.0-1098.105 | < 5.4.0-1039.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0a25e1f4f18566b750ebd3ae995af64e23111e63, < 5408824636fa0dfedb9ecb0d94abd573131bfbbe | ≥ 0a25e1f4f18566b750ebd3ae995af64e23111e63, < ddd1416f44130377798c1430b76503513b7497c2 | ≥ 0a25e1f4f18566b750ebd3ae995af64e23111e63, < ec939c13c3fff2114479769c8380b7f1a54feca9 | ≥ 0a25e1f4f18566b750ebd3ae995af64e23111e63, < 50aca891d7a554db0901b245167cd653d73aaa71 | 4.0
  • linux_kernel≥ 4.0, < 4.19.171 | ≥ 4.20, < 5.4.93 | ≥ 5.5, < 5.10.11 | 5.11:rc1 | 5.11:rc2 | 5.11:rc3 | 5.11:rc4
Debian1 product
  • linux< 5.10.12-1

3 vendors · 99 products

References

8 links