CVE-2021-47055

MEDIUM
Published Feb 29, 2024 Modified Jan 9, 2025 CWE-667

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.

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CVSS v3.1 Score

5.5
MEDIUM
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-667 CWE-667

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

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://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

Frequently Asked Questions

What is CVE-2021-47055? +
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. It has a CVSS v3.1 base score of 5.5 (MEDIUM).
How severe is CVE-2021-47055? +
CVE-2021-47055 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.
What products are affected by CVE-2021-47055? +
CVE-2021-47055 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2021-47055? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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