What is CVE-2021-47455?

CVE-2021-47455 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Memory Leak flaw (CWE-401), affecting Linux kernel versions from 3.16.83 onward and patched in 5.10.241, 5.14.15 and 5.15. CVE-2021-47455 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47455?

CVE-2021-47455 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-2021-47455?

Yes, CVE-2021-47455 has been patched. Fixed versions include 5.10.241, 5.14.15 and 5.15. If you are running Linux kernel 3.16.83 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47455 actively exploited?

CVE-2021-47455 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Memory Leak (CWE-401)?

The product does not release memory after use, causing gradual resource exhaustion. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/401.html

CVE-2021-47455

Medium

In the Linux kernel, the following vulnerability has been resolved: ptp: Fix possible memory leak in ptp_clock_register() I got memory leak as follows when doing fault injection test: unreferenced object 0xffff88800906c618 (size 8): comm "i2c-idt82p33931", pid 4421, jiffies 4294948083 (age 13.188s) hex dump (first 8 bytes): 70 74 70 30 00 00 00 00 ptp0.... backtrace: [<00000000312ed458>] __kmalloc_track_caller+0x19f/0x3a0 [<0000000079f6e2ff>] kvasprintf+0xb5/0x150 [<0000000026aae54f>] kvasprintf_const+0x60/0x190 [<00000000f323a5f7>] kobject_set_name_vargs+0x56/0x150 [<000000004e35abdd>] dev_set_name+0xc0/0x100 [<00000000f20cfe25>] ptp_clock_register+0x9f4/0xd30 [ptp] [<000000008bb9f0de>] idt82p33_probe.cold+0x8b6/0x1561 [ptp_idt82p33] When posix_clock_register() returns an error, the name allocated in dev_set_name() will be leaked, the put_device() should be used to give up the device reference, then the name will be freed in kobject_cleanup() and other memory will be freed in ptp_clock_release().

Package Linux Kernel

Published 2024-05-22

Last modified 2025-11-03

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-401

CVE-2021-47455 is a Memory Leak vulnerability

What is Memory Leak?

The product does not release memory after use, causing gradual resource exhaustion. Learn more on MITRE CWE

Affected versions

Linux kernel versions 3.16.83, 4.4.224, 4.9.224, 4.14.162, 4.19.93, 5.4.8, 5.5 and later are affected. Fixed in 5.10.241, 5.14.15, 5.15 and their respective stable series.

Affected from

≥ 3.16.83 ≥ 4.4.224 ≥ 4.9.224 ≥ 4.14.162 ≥ 4.19.93 ≥ 5.4.8 ≥ 5.5

Fixed in

✓ 5.10.241 5.10.x ✓ 5.14.15 5.14.x ✓ 5.15

References

4 total

Kernel Git
https://git.kernel.org/stable/c/4225fea1cb28370086e17e82c0f69bec2779dca0

Patch
Kernel Git
https://git.kernel.org/stable/c/95c0a0c5ec8839f8f21672be786e87a100319ca8

Patch
Kernel Git
https://git.kernel.org/stable/c/f1c96d8085588e1b997a96214b409ac3be20b524
Debian Security
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html

Details

CVE ID CVE-2021-47455

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-11-03

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47455?

CVE-2021-47455 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a Memory Leak flaw (CWE-401) . It affects Linux kernel versions from 3.16.83 onward and has been patched in 5.10.241, 5.14.15 and 5.15. CVE-2021-47455 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47455?

CVE-2021-47455 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-2021-47455?

Yes. CVE-2021-47455 has been patched. Fixed versions include 5.10.241, 5.14.15 and 5.15. If you are running Linux kernel 3.16.83 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47455 actively exploited?

No. CVE-2021-47455 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.