CVE-2021-47293

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

21/05/2024

Last modified:

07/05/2025

Description

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_skbmod: Skip non-Ethernet packets Currently tcf_skbmod_act() assumes that packets use Ethernet as their L2 protocol, which is not always the case. As an example, for CAN devices: $ ip link add dev vcan0 type vcan $ ip link set up vcan0 $ tc qdisc add dev vcan0 root handle 1: htb $ tc filter add dev vcan0 parent 1: protocol ip prio 10 \ matchall action skbmod swap mac Doing the above silently corrupts all the packets. Do not perform skbmod actions for non-Ethernet packets.

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::::::::	4.9 (including)	4.19.199 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	4.20 (including)	5.4.136 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.5 (including)	5.10.54 (excluding)
cpe:2.3:o:linux:linux_kernel::::::::	5.11 (including)	5.13.6 (excluding)
cpe:2.3:o:linux:linux_kernel:5.14:rc1::::::
cpe:2.3:o:linux:linux_kernel:5.14:rc2::::::

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

CVE-2021-47293

Description

Impact

Vulnerable products and versions

References to Advisories, Solutions, and Tools