CVE-2021-47055

Summary

CVE-2021-47055 is a vulnerability affecting the Linux kernel that has been addressed. This issue lies in the 'mtd' subsystem where certain ioctls (Input/Output Control) require write permissions for locking and modifying protection bits, such as MEMLOCK, MEMUNLOCK, and OTPLOCK. Given that MEMLOCK might be write-once on certain hardware, and OTPLOCK is always write-once, the requirement for write access could potentially lead to unintended consequences. Furthermore, the MEMSETBADBLOCK ioctl, which modifies the bad block table, also necessitates write permissions.

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