What is CVE-2021-46966?

CVE-2021-46966 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416). CVE-2021-46966 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-46966?

CVE-2021-46966 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-2021-46966?

No patch is currently available for CVE-2021-46966. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-46966 actively exploited?

CVE-2021-46966 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-2021-46966

High

In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential use-after-free issue In cm_write(), buf is always freed when reaching the end of the function. If the requested count is less than table.length, the allocated buffer will be freed but subsequent calls to cm_write() will still try to access it. Remove the unconditional kfree(buf) at the end of the function and set the buf to NULL in the -EINVAL error path to match the rest of function.

Package Linux Kernel

Published 2024-02-27

Last modified 2024-12-06

CVSS version 3.1

Patch available

Awaiting data

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

Weakness type

CWE-416

CVE-2021-46966 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-2021-46966 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/1d53ca5d131074c925ce38361fb0376d3bf7e394
Patch
Kernel patch commit
https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203
Patch
Kernel patch commit
https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b
Patch

9 patch commits total View all on NVD

Details

CVE ID CVE-2021-46966

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-02-27

Modified 2024-12-06

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-46966?

CVE-2021-46966 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . CVE-2021-46966 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-46966?

CVE-2021-46966 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-2021-46966?

No patch is currently available for CVE-2021-46966. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-46966 actively exploited?

No — CVE-2021-46966 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 →