CVE-2021-47058

High

In the Linux kernel, the following vulnerability has been resolved: regmap: set debugfs_name to NULL after it is freed There is a upstream commit cffa4b2122f5("regmap:debugfs: Fix a memory leak when calling regmap_attach_dev") that adds a if condition when create name for debugfs_name. With below function invoking logical, debugfs_name is freed in regmap_debugfs_exit(), but it is not created again because of the if condition introduced by above commit. regmap_reinit_cache() regmap_debugfs_exit() ... regmap_debugfs_init() So, set debugfs_name to NULL after it is freed.

Package Linux Kernel
Published 2024-02-29
Last modified 2024-12-10
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-2021-47058 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 4.19.168, 5.4.90, 5.10.8, 5.11 and later are affected. Fixed in 4.19.191, 5.4.119, 5.10.37, 5.11.21, 5.12.4, 5.13 and their respective stable series.

Affected from
≥ 4.19.168 ≥ 5.4.90 ≥ 5.10.8 ≥ 5.11
Fixed in
✓ 4.19.191 4.19.x ✓ 5.4.119 5.4.x ✓ 5.10.37 5.10.x ✓ 5.11.21 5.11.x ✓ 5.12.4 5.12.x ✓ 5.13

References

6 total
Showing 5 of 6 references View all on NVD

Frequently asked questions

  • What is CVE-2021-47058?

    CVE-2021-47058 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 4.19.168 onward and has been patched in 4.19.191, 5.4.119, 5.10.37 and others. CVE-2021-47058 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-47058?

    CVE-2021-47058 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-2021-47058?

    Yes. CVE-2021-47058 has been patched. Fixed versions include 4.19.191, 5.4.119, 5.10.37 and others. If you are running Linux kernel 4.19.168 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-47058 actively exploited?

    No. CVE-2021-47058 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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