CVE-2021-47055

Advisory lineage Upstream: 0 Downstream: 11
Analyzed
Published: 29 Feb 2024, 22:37
Last modified:23 May 2026, 15:19

Vulnerability Summary

Overall Risk (default)
low
22/100
CVSS Score
5.5 MEDIUM
v3.1 (nvd)
EPSS Score
<0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

29 Feb 2024, 22:37
Published
Vulnerability first disclosed
23 May 2026, 15:19
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Techniques & Countermeasures

  • CWE-667•Improper Locking

    The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Systems

  • linux•linux

    ≥ 1c9f9125892a43901438bf704ada6b7019e2a884, < f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf | ≥ 583d42400532fbd6228b0254d7c732b771e4750d, < 9625b00cac6630479c0ff4b9fafa88bee636e1f0 | ≥ 389c74c218d3b182e9cd767e98cee0e0fd0dabaa, < f73b29819c6314c0ba8b7d5892dfb03487424bee | ≥ ab1a602a9cea98aa37b2e6851b168d2a2633a58d, < 75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37 | ≥ 9a53e8bd59d9f070505e51d3fd19606a270e6b93, < 5880afefe0cb9b2d5e801816acd58bfe91a96981 | ≥ f7e6b19bc76471ba03725fe58e0c218a3d6266c3, < 7b6552719c0ccbbea29dde4be141da54fdb5877e | ≥ f7e6b19bc76471ba03725fe58e0c218a3d6266c3, < 077259f5e777c3c8821f6b41dee709fcda27306b | ≥ f7e6b19bc76471ba03725fe58e0c218a3d6266c3, < a08799d3e8c8088640956237c183f83463c39668 | ≥ f7e6b19bc76471ba03725fe58e0c218a3d6266c3, < 1e97743fd180981bef5f01402342bb54bf1c6366 | 36a8b2f49235e63ab3f901fe12e1b6732f075c2e | eb3d82abc335624a5e8ecfb75aba0b684e2dc4db | ≥ 4.4.233, < 4.4.269 | ≥ 4.9.233, < 4.9.269 | ≥ 4.14.194, < 4.14.233 | ≥ 4.19.139, < 4.19.191 | ≥ 5.4.58, < 5.4.119 | ≥ 5.7.15, < 5.8 | ≥ 5.8.1, < 5.9 | 5.9

  • linux•linux_kernel

    ≥ 4.4.233, < 4.4.269 | ≥ 4.9.233, < 4.9.269 | ≥ 4.14.194, < 4.14.233 | ≥ 4.19.139, < 4.19.191 | ≥ 5.4.58, < 5.4.119 | ≥ 5.9, < 5.10.37 | ≥ 5.11, < 5.11.21 | ≥ 5.12, < 5.12.4

References (9)