CVE-2024-26791 btrfs: dev-replace: properly validate device names

2024-04-0408:20:22

Linux

github.com

linux kernel

vulnerability

btrfs

device names

validation

syzbot

buffer overflow

AI Score

6.8

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

In the Linux kernel, the following vulnerability has been resolved:

btrfs: dev-replace: properly validate device names

There’s a syzbot report that device name buffers passed to device
replace are not properly checked for string termination which could lead
to a read out of bounds in getname_kernel().

Add a helper that validates both source and target device name buffers.
For devid as the source initialize the buffer to empty string in case
something tries to read it later.

This was originally analyzed and fixed in a different way by Edward Adam
Davis (see links).