7.1

CVE-2021-47055: mtd: require write permissions for locking and badblock ioctls

Modified
AliasesUBUNTU-CVE-2021-47055DEBIAN-CVE-2021-47055
Published 29-02-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-47055 is a high (CVSS 7.1) Improper Locking vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 9.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.1, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.20%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 7
RHSA-2024:3618RHSA-2024:3627SUSE-SU-2024:1454-1SUSE-SU-2024:1465-1SUSE-SU-2024:1489-1SUSE-SU-2024:1643-1

Timeline

  1. 29-02-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability 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

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.20%

Chance of exploitation in the next 30 days

Percentile

10%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.20% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu86 products
  • linux< 4.4.0-261.295 | < 4.15.0-151.157 | < 5.4.0-77.86
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1138.144 | < 4.4.0-1176.191 | < 4.15.0-1109.116 | < 5.4.0-1051.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • 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_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
Debian1 product
  • linux< 5.10.38-1

3 vendors · 89 products

References

14 links
Show all 14 references