What is CVE-2021-47670?

CVE-2021-47670 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 8.8/10. Published 2025-04-17.

How severe is CVE-2021-47670?

High severity. CVSS v3 base score is 8.8 out of 10.

Use After Free in Linux

CVE-2021-47670

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.

Vulnerability class: Use-After-Free

EPSS: 0.002 (7.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Linux — versions 0a25e1f4f18566b750ebd3ae995af64e23111e63, 4.0, 0
Linux Linux_kernel — versions 5.11

Weakness classification (CWE)

CWE-416 — Use After Free

References

416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)
416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Patch)

Frequently asked questions

What is CVE-2021-47670?: CVE-2021-47670 is a high-severity vulnerability in Linux, classified under Use After Free. CVSS score: 8.8/10. Published 2025-04-17.
How severe is CVE-2021-47670?: High severity. CVSS v3 base score is 8.8 out of 10.