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Description
A divide-by-zero vulnerability in the ext4_block_set_lb_size function in src/ext4_blockdev.c of the lwext4 1.0.0 library allows attackers to cause a denial of service by providing a malformed ext4 filesystem image that results in a zero logical block size. The vulnerability is triggered during mount or image processing and leads to a Floating-Point Exception (FPE) under sanitizers or a runtime crash in standard builds due to missing validation of lb_size.
References
github.com/gkostka/lwext4/issues/90
github.com/gkostka/lwext4/issues/90
github.com/...res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127
infosec.exchange/@sigdevel/116668952003072580