What is CVE-2021-47456?

CVE-2021-47456 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10, classified as a Use After Free flaw (CWE-416). CVE-2021-47456 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47456?

CVE-2021-47456 has a CVSS score of 8.4 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-47456?

No patch is currently available for CVE-2021-47456. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-47456 actively exploited?

CVE-2021-47456 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2021-47456

High

In the Linux kernel, the following vulnerability has been resolved: can: peak_pci: peak_pci_remove(): fix UAF When remove the module peek_pci, referencing 'chan' again after releasing 'dev' will cause UAF. Fix this by releasing 'dev' later. The following log reveals it: [ 35.961814 ] BUG: KASAN: use-after-free in peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.963414 ] Read of size 8 at addr ffff888136998ee8 by task modprobe/5537 [ 35.965513 ] Call Trace: [ 35.965718 ] dump_stack_lvl+0xa8/0xd1 [ 35.966028 ] print_address_description+0x87/0x3b0 [ 35.966420 ] kasan_report+0x172/0x1c0 [ 35.966725 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967137 ] ? trace_irq_enable_rcuidle+0x10/0x170 [ 35.967529 ] ? peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.967945 ] __asan_report_load8_noabort+0x14/0x20 [ 35.968346 ] peak_pci_remove+0x16f/0x270 [peak_pci] [ 35.968752 ] pci_device_remove+0xa9/0x250

Package Linux Kernel

Published 2024-05-22

Last modified 2025-04-02

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

8.4

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2021-47456 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-47456 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/0e5afdc2315b0737edcf55bede4ee1640d2d464d
Patch
Kernel patch commit
https://git.kernel.org/stable/c/1248582e47a9f7ce0ecd156c39fc61f8b6aa3699
Patch
Kernel patch commit
https://git.kernel.org/stable/c/1c616528ba4aeb1125a06b407572ab7b56acae38
Patch

8 patch commits total View all on NVD

Details

CVE ID CVE-2021-47456

Severity High

CVSS score 8.4 / 10

CVSS version 3.1

Published 2024-05-22

Modified 2025-04-02

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-47456?

CVE-2021-47456 is a High severity Linux kernel vulnerability with a CVSS score of 8.4 out of 10 , classified as an Use After Free flaw (CWE-416) . CVE-2021-47456 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47456?

CVE-2021-47456 has a CVSS score of 8.4 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-47456?

No patch is currently available for CVE-2021-47456. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-47456 actively exploited?

No — CVE-2021-47456 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. View CWE-416 on MITRE CWE →