What is CVE-2021-47202?

CVE-2021-47202 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476), affecting Linux kernel versions from 3.19 onward and patched in 5.4.210, 5.10.81, 5.14.21 and others. CVE-2021-47202 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47202?

CVE-2021-47202 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-2021-47202?

Yes, CVE-2021-47202 has been patched. Fixed versions include 5.4.210, 5.10.81, 5.14.21 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-2021-47202 actively exploited?

CVE-2021-47202 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2021-47202

Medium

In the Linux kernel, the following vulnerability has been resolved: thermal: Fix NULL pointer dereferences in of_thermal_ functions of_parse_thermal_zones() parses the thermal-zones node and registers a thermal_zone device for each subnode. However, if a thermal zone is consuming a thermal sensor and that thermal sensor device hasn't probed yet, an attempt to set trip_point_*_temp for that thermal zone device can cause a NULL pointer dereference. Fix it. console:/sys/class/thermal/thermal_zone87 # echo 120000 > trip_point_0_temp ... Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 ... Call trace: of_thermal_set_trip_temp+0x40/0xc4 trip_point_temp_store+0xc0/0x1dc dev_attr_store+0x38/0x88 sysfs_kf_write+0x64/0xc0 kernfs_fop_write_iter+0x108/0x1d0 vfs_write+0x2f4/0x368 ksys_write+0x7c/0xec __arm64_sys_write+0x20/0x30 el0_svc_common.llvm.7279915941325364641+0xbc/0x1bc do_el0_svc+0x28/0xa0 el0_svc+0x14/0x24 el0_sync_handler+0x88/0xec el0_sync+0x1c0/0x200 While at it, fix the possible NULL pointer dereference in other functions as well: of_thermal_get_temp(), of_thermal_set_emul_temp(), of_thermal_get_trend().

Package Linux Kernel

Published 2024-04-10

Last modified 2025-01-14

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-476

CVE-2021-47202 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.19 and later are affected. Fixed in 5.4.210, 5.10.81, 5.14.21, 5.15.4, 5.16 and their respective stable series.

Affected from

≥ 3.19

Fixed in

✓ 5.4.210 5.4.x ✓ 5.10.81 5.10.x ✓ 5.14.21 5.14.x ✓ 5.15.4 5.15.x ✓ 5.16

References

5 total

Kernel Git
https://git.kernel.org/stable/c/0750f769b95841b34a9fe8c418dd792ff526bf86

Patch
Kernel Git
https://git.kernel.org/stable/c/6a315471cb6a07f651e1d3adc8962730f4fcccac

Patch
Kernel Git
https://git.kernel.org/stable/c/828f4c31684da94ecf0b44a2cbd35bbede04f0bd

Patch
Kernel Git
https://git.kernel.org/stable/c/96cfe05051fd8543cdedd6807ec59a0e6c409195

Patch
Kernel Git
https://git.kernel.org/stable/c/ef2590a5305e0b8e9342f84c2214aa478ee7f28e

Patch

Details

CVE ID CVE-2021-47202

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-04-10

Modified 2025-01-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47202?

CVE-2021-47202 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . It affects Linux kernel versions from 3.19 onward and has been patched in 5.4.210, 5.10.81, 5.14.21 and others. CVE-2021-47202 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47202?

CVE-2021-47202 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-2021-47202?

Yes. CVE-2021-47202 has been patched. Fixed versions include 5.4.210, 5.10.81, 5.14.21 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-2021-47202 actively exploited?

No. CVE-2021-47202 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.