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CVE-2021-47668

nvd nist
Published: Apr 17, 2025Modified: Jun 17, 2026

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7.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Exploitability: 1.8 / Impact: 5.9
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

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.

Affected (10)

Products: Linux: Linux Kernel
Linux
1 product
Linux Kernel
Configuration A
10 vulnerable
Vulnerable SoftwareAffected Versions
Linux
Linux Kernel
From 2.6.31 to 4.4.254
Linux Kernel
From 4.10 to 4.14.218
Linux Kernel
From 4.15 to 4.19.171
Linux Kernel
From 4.20 to 5.4.93
Linux Kernel
From 4.5 to 4.9.254
Linux Kernel
From 5.5 to 5.10.11
Linux Kernel
Version 5.11 rc1
Linux Kernel
Version 5.11 rc2
Linux Kernel
Version 5.11 rc3
Linux Kernel
Version 5.11 rc4

Related CWEs

CWE-416
Use After Free
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (7)

Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch
Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Patch

Timeline

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