What is CVE-2021-47602?

CVE-2021-47602 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Access of Uninitialized Pointer flaw (CWE-824), affecting Linux kernel versions from 3.19 onward and patched in 4.19.222, 5.4.168, 5.10.88 and others. CVE-2021-47602 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47602?

CVE-2021-47602 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47602?

Yes, CVE-2021-47602 has been patched. Fixed versions include 4.19.222, 5.4.168, 5.10.88 and others. If you are running Linux kernel 3.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47602 actively exploited?

CVE-2021-47602 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Access of Uninitialized Pointer (CWE-824)?

The product accesses or uses a pointer that has not been initialised, leading to undefined behaviour. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/824.html

CVE-2021-47602

Medium

In the Linux kernel, the following vulnerability has been resolved: mac80211: track only QoS data frames for admission control For admission control, obviously all of that only works for QoS data frames, otherwise we cannot even access the QoS field in the header. Syzbot reported (see below) an uninitialized value here due to a status of a non-QoS nullfunc packet, which isn't even long enough to contain the QoS header. Fix this to only do anything for QoS data packets.

Package Linux Kernel

Published 2024-06-19

Last modified 2024-11-21

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-824

CVE-2021-47602 is a Access of Uninitialized Pointer vulnerability

What is Access of Uninitialized Pointer?

The product accesses or uses a pointer that has not been initialised, leading to undefined behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.19 and later are affected. Fixed in 4.19.222, 5.4.168, 5.10.88, 5.15.11, 5.16 and their respective stable series.

Affected from

≥ 3.19

Fixed in

✓ 4.19.222 4.19.x ✓ 5.4.168 5.4.x ✓ 5.10.88 5.10.x ✓ 5.15.11 5.15.x ✓ 5.16

References

5 total

Kernel Git
https://git.kernel.org/stable/c/42d08e97b196479f593499e887a9ab81446a34b9

Patch
Kernel Git
https://git.kernel.org/stable/c/46b9e29db2012a4d2a40a26101862e002ccf387b

Patch
Kernel Git
https://git.kernel.org/stable/c/69f054d6642c8f6173724ce17e7ee3ff66b8f682

Patch
Kernel Git
https://git.kernel.org/stable/c/d5e568c3a4ec2ddd23e7dc5ad5b0c64e4f22981a

Patch
Kernel Git
https://git.kernel.org/stable/c/eed897a22230e3231a740eddd7d6d95ba476625f

Patch

Details

CVE ID CVE-2021-47602

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-06-19

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47602?

CVE-2021-47602 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Access of Uninitialized Pointer flaw (CWE-824) . It affects Linux kernel versions from 3.19 onward and has been patched in 4.19.222, 5.4.168, 5.10.88 and others. CVE-2021-47602 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47602?

CVE-2021-47602 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47602?

Yes. CVE-2021-47602 has been patched. Fixed versions include 4.19.222, 5.4.168, 5.10.88 and others. If you are running Linux kernel 3.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47602 actively exploited?

No. CVE-2021-47602 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.