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
Yes

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

Affected versions

Linux kernel versions 4.4.195, 4.9.195, 4.14.147, 4.19.77, 5.2.19, 5.3.4, 5.4 and later are affected. Fixed in 4.4.269, 4.9.269, 4.14.233, 4.19.191, 5.4.118, 5.10.36, 5.11.20, 5.12.3, 5.13 and their respective stable series.

Affected from
≥ 4.4.195 ≥ 4.9.195 ≥ 4.14.147 ≥ 4.19.77 ≥ 5.2.19 ≥ 5.3.4 ≥ 5.4
Fixed in
✓ 4.4.269 4.4.x ✓ 4.9.269 4.9.x ✓ 4.14.233 4.14.x ✓ 4.19.191 4.19.x ✓ 5.4.118 5.4.x ✓ 5.10.36 5.10.x ✓ 5.11.20 5.11.x ✓ 5.12.3 5.12.x ✓ 5.13

References

9 total
Showing 5 of 9 references View all on NVD

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) . It affects Linux kernel versions from 4.4.195 onward and has been patched in 4.4.269, 4.9.269, 4.14.233 and others. 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?

    Yes. CVE-2021-46966 has been patched. Fixed versions include 4.4.269, 4.9.269, 4.14.233 and others. If you are running Linux kernel 4.4.195 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • 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.

Back to
All CVEs
View on
NVD / NIST