CVE-2021-47055

Medium

In the Linux kernel, the following vulnerability has been resolved: mtd: require write permissions for locking and badblock ioctls MEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require write permission. Depending on the hardware MEMLOCK might even be write-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK is always write-once. MEMSETBADBLOCK modifies the bad block table.

Package Linux Kernel
Published 2024-02-29
Last modified 2025-01-09
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-667

CVE-2021-47055 is a Improper Locking vulnerability

What is Improper Locking?

The product does not properly acquire or release a lock, which can lead to unexpected behaviour. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.4.233, 4.9.233, 4.14.194, 4.19.139, 5.4.58, 5.7.15, 5.8.1, 5.9 and later are affected. Fixed in 4.4.269, 4.9.269, 4.14.233, 4.19.191, 5.4.119, 5.10.37, 5.11.21, 5.12.4, 5.13 and their respective stable series.

Affected from
≥ 4.4.233 ≥ 4.9.233 ≥ 4.14.194 ≥ 4.19.139 ≥ 5.4.58 ≥ 5.7.15 ≥ 5.8.1 ≥ 5.9
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 ✓ 5.4.119 5.4.x ✓ 5.10.37 5.10.x ✓ 5.11.21 5.11.x ✓ 5.12.4 5.12.x ✓ 5.13

References

9 total
Showing 5 of 9 references View all on NVD

Frequently asked questions

  • What is CVE-2021-47055?

    CVE-2021-47055 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Improper Locking flaw (CWE-667) . It affects Linux kernel versions from 4.4.233 onward and has been patched in 4.4.269, 4.9.269, 4.14.233 and others. CVE-2021-47055 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2021-47055?

    CVE-2021-47055 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-2021-47055?

    Yes. CVE-2021-47055 has been patched. Fixed versions include 4.4.269, 4.9.269, 4.14.233 and others. If you are running Linux kernel 4.4.233 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2021-47055 actively exploited?

    No. CVE-2021-47055 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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