CVE-2021-47668

Severity CVSS v4.0:

Pending analysis

Type:

CWE-416 Use After Free

Publication date:

17/04/2025

Last modified:

21/04/2025

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.

Impact

Vector 3.x

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.80 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x

7.80

Severity 3.x

HIGH

Vulnerable products and versions

CPE	From	Up to
cpe:2.3:o:linux:linux_kernel::::::::	2.6.31 (including)	4.4.254 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.5 (including)	4.9.254 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.10 (including)	4.14.218 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.15 (including)	4.19.171 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.93 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.11 (excluding)
cpe:2.3:o:linux:linux_kernel:5.11:rc1::::::
cpe:2.3:o:linux:linux_kernel:5.11:rc2::::::
cpe:2.3:o:linux:linux_kernel:5.11:rc3::::::
cpe:2.3:o:linux:linux_kernel:5.11:rc4::::::

To consult the complete list of CPE names with products and versions, see this page

CVE-2021-47668

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools