CVE-2025-70099

HIGH 7.5

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

A NULL pointer dereference in the ext4_dir_en_get_name_len function in include/ext4_dir.h of lwext4 1.0.0 allows attackers to cause a denial of service by supplying a specially crafted EXT4 filesystem image with malformed directory entries. During directory iteration, the code may fail to validate the directory entry pointer before accessing the name_len field, resulting in a segmentation fault. This affects versions based on (or equivalent to) the 2016-era codebase (1.0.0).

Vendor	n/a
Product	n/a
Published	Jun 1, 2026
Last Updated	Jun 2, 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/89 github.com: https://github.com/sigdevel/pocs/blob/main/res/lwext4/1/sig11_2_1_lwext4_ext4_dir_h_126 infosec.exchange: https://infosec.exchange/@sigdevel/116668939725424227