CVE-2021-47668

HIGH

Linux Kernel 2.6.31-4.4.253 - Use-After-Free in CAN Device Restart

Title source: llm
STIX 2.1

Description

In the Linux kernel, the following vulnerability has been resolved: can: dev: can_restart: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the can_frame cf which aliases skb memory is accessed after the netif_rx_ni() in: stats->rx_bytes += cf->len; Reordering the lines solves the issue.

References (7)

Core 7

Scores

CVSS v3 7.8
EPSS 0.0016
EPSS Percentile 5.3%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (18)
Linux/Linux < 2.6.31
Linux/Linux 2.6.31
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - 03f16c5075b22c8902d2af739969e878b0879c94
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - 08ab951787098ae0b6c0364aeea7a8138226f234
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - 260925a0b7d2da5449f8ecfd02c1405e0c8a45b8
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - 593c072b7b3c4d7044416eb039d9ad706bedd67a
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - 92668d28c7e6a7a2ba07df287669ffcdf650c421
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - ac48ef15826e83f4206c47add61072e8fc76d328
Linux/Linux 39549eef3587f1c1e8c65c88a2400d10fd30ea17 - bbc6847b9b8978b520f62fbc7c68c54ef0f8d282
Linux/Linux 4.14.218 - 4.14.*
... and 8 more
Published Apr 17, 2025
Tracked Since Feb 18, 2026