Medium severity5.5NVD Advisory· Published Jun 3, 2026· Updated Jun 5, 2026
CVE-2025-70100
CVE-2025-70100
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.
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Affected products
2Patches
Vulnerability mechanics
References
3- github.com/gkostka/lwext4/issues/90nvdExploitIssue TrackingPatch
- github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127nvdExploit
- infosec.exchange/@sigdevel/116668952003072580nvdExploitPatchThird Party Advisory
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