CVE-2021-47055: mtd: require write permissions for locking and badblock ioctls
First published: Thu Feb 29 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.4.269 | 4.4.269 |
| redhat/kernel | <4.9.269 | 4.9.269 |
| redhat/kernel | <4.14.233 | 4.14.233 |
| redhat/kernel | <4.19.191 | 4.19.191 |
| redhat/kernel | <5.4.119 | 5.4.119 |
| redhat/kernel | <5.10.37 | 5.10.37 |
| redhat/kernel | <5.11.21 | 5.11.21 |
| redhat/kernel | <5.12.4 | 5.12.4 |
| redhat/kernel | <5.13 | 5.13 |
| Linux Kernel | >=4.4.233<4.4.269 | |
| Linux Kernel | >=4.9.233<4.9.269 | |
| Linux Kernel | >=4.14.194<4.14.233 | |
| Linux Kernel | >=4.19.139<4.19.191 | |
| Linux Kernel | >=5.4.58<5.4.119 | |
| Linux Kernel | >=5.9<5.10.37 | |
| Linux Kernel | >=5.11<5.11.21 | |
| Linux Kernel | >=5.12<5.12.4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://git.kernel.org/stable/c/077259f5e777c3c8821f6b41dee709fcda27306b
- https://git.kernel.org/stable/c/1e97743fd180981bef5f01402342bb54bf1c6366
- https://git.kernel.org/stable/c/5880afefe0cb9b2d5e801816acd58bfe91a96981
- https://git.kernel.org/stable/c/75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37
- https://git.kernel.org/stable/c/7b6552719c0ccbbea29dde4be141da54fdb5877e
- https://git.kernel.org/stable/c/9625b00cac6630479c0ff4b9fafa88bee636e1f0
- https://git.kernel.org/stable/c/a08799d3e8c8088640956237c183f83463c39668
- https://git.kernel.org/stable/c/f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf
- https://git.kernel.org/stable/c/f73b29819c6314c0ba8b7d5892dfb03487424bee
- https://access.redhat.com/security/cve/CVE-2021-47055
- https://lore.kernel.org/linux-cve-announce/2024022950-CVE-2021-47055-6927@gregkh/T/#u
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2267186
- https://access.redhat.com/errata/RHSA-2024:3618
- https://access.redhat.com/errata/RHSA-2024:3627
- https://bugzilla.redhat.com/show_bug.cgi?id=2267185
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47055
- https://nvd.nist.gov/vuln/detail/CVE-2021-47055
- https://launchpad.net/bugs/cve/CVE-2021-47055
- https://security-tracker.debian.org/tracker/CVE-2021-47055
- https://ubuntu.com/security/CVE-2021-47055
- https://git.kernel.org/linus/1e97743fd180981bef5f01402342bb54bf1c6366
Frequently Asked Questions
What is the severity of CVE-2021-47055?
CVE-2021-47055 has a medium severity due to improper permission checks in the Linux kernel.
How do I fix CVE-2021-47055?
To fix CVE-2021-47055, you should update your Linux kernel to the specified patched versions such as 4.4.269, 4.9.269, 4.14.233, or others listed in the advisory.
Which Linux kernel versions are affected by CVE-2021-47055?
CVE-2021-47055 affects multiple Linux kernel versions prior to the patched versions including 4.4.269, 4.9.269, 4.14.233, and later.
Is CVE-2021-47055 specific to any distribution of Linux?
CVE-2021-47055 is applicable to various distributions of Linux that use the affected kernel versions such as Red Hat and Debian.
What are the consequences of not addressing CVE-2021-47055?
Failing to address CVE-2021-47055 may lead to unauthorized write access to critical parts of the memory, compromising system integrity.
- agent/title
- agent/first-publish-date
- agent/type
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-47055
- agent/software-canonical-lookup
- agent/author
- collector/launchpad-cve
- source/Launchpad
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/trending
- agent/weakness
- agent/last-modified-date
- agent/severity
- agent/remedy
- agent/source
- collector/usn-cve
- source/Ubuntu
- agent/description
- agent/event
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup-request
- collector/nvd-api
- agent/tags
- agent/softwarecombine
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- vendor/linux
- canonical/linux kernel
- version/linux kernel/4.4.233
- version/linux kernel/4.9.233
- version/linux kernel/4.14.194
- version/linux kernel/4.19.139
- version/linux kernel/5.4.58
- version/linux kernel/5.9
- version/linux kernel/5.11
- version/linux kernel/5.12
- package-manager/debian