What is CVE-2021-47293?

CVE-2021-47293 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, affecting Linux kernel versions from 4.9 onward and patched in 4.19.199, 5.4.136, 5.10.54 and others. CVE-2021-47293 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47293?

CVE-2021-47293 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-47293?

Yes, CVE-2021-47293 has been patched. Fixed versions include 4.19.199, 5.4.136, 5.10.54 and others. If you are running Linux kernel 4.9 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47293 actively exploited?

CVE-2021-47293 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2021-47293

High

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.

Package Linux Kernel

Published 2024-05-21

Last modified 2025-05-07

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected versions

Linux kernel versions 4.9 and later are affected. Fixed in 4.19.199, 5.4.136, 5.10.54, 5.13.6, 5.14 and their respective stable series.

Affected from

≥ 4.9

Fixed in

✓ 4.19.199 4.19.x ✓ 5.4.136 5.4.x ✓ 5.10.54 5.10.x ✓ 5.13.6 5.13.x ✓ 5.14

References

5 total

Kernel Git
https://git.kernel.org/stable/c/071729150be9e1d1b851b70efb6d91ee9269d57b

Patch
Kernel Git
https://git.kernel.org/stable/c/34f1e1f657fae2891b485a3b2b95fe4d2aef9f0d

Patch
Kernel Git
https://git.kernel.org/stable/c/727d6a8b7ef3d25080fad228b2c4a1d4da5999c6

Patch
Kernel Git
https://git.kernel.org/stable/c/a88414fb1117f2fe65fb88e45ba694e1d09d5024

Patch
Kernel Git
https://git.kernel.org/stable/c/e4fdca366806f6bab374d1a95e626a10a3854b0c

Patch

Details

CVE ID CVE-2021-47293

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2025-05-07

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47293?

CVE-2021-47293 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 . It affects Linux kernel versions from 4.9 onward and has been patched in 4.19.199, 5.4.136, 5.10.54 and others. CVE-2021-47293 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47293?

CVE-2021-47293 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-47293?

Yes. CVE-2021-47293 has been patched. Fixed versions include 4.19.199, 5.4.136, 5.10.54 and others. If you are running Linux kernel 4.9 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47293 actively exploited?

No. CVE-2021-47293 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.