Review reviewHigh

CVE-2021-47670

Linux Linux, linux kernel

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: 8.8
EPSS: 0.24%
CISA KEV: Not listed
Published: 2025.04.18

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.24%

Technical severityCVSS 8.8

Vulnerability overview

Affected product and versions

Product: Linux Linux, linux kernel
Affected versions: >= 0a25e1f4f18566b750ebd3ae995af64e23111e63 < 5408824636fa0dfedb9ecb0d94abd573131bfbbe, >= 0a25e1f4f18566b750ebd3ae995af64e23111e63 < ddd1416f44130377798c1430b76503513b7497c2, >= 0a25e1f4f18566b750ebd3ae995af64e23111e63 < ec939c13c3fff2114479769c8380b7f1a54feca9, >= 0a25e1f4f18566b750ebd3ae995af64e23111e63 < 50aca891d7a554db0901b245167cd653d73aaa71, >= 4.0, >= 4.0 < 4.19.171, >= 4.20 < 5.4.93, >= 5.5 < 5.10.11, 5.11
Fixed versions: 4.19.171, 5.4.93, 5.10.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Linux Linux, linux kernel and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-416