CVE-2025-70100

MEDIUM 5.5

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	n/a
Product	n/a
Published	Jun 3, 2026
Last Updated	Jun 3, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/gkostka/lwext4/issues/90 github.com: https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127 infosec.exchange: https://infosec.exchange/@sigdevel/116668952003072580