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    CVE-2025-70100

    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.

    Published:Jun 3, 2026
    Last Modified:Jun 5, 2026
    EPS:Jun 3, 2026
    EPSS Score:0.00012
    CVSS Score:5.5

    Affected Products

    Vendor
    Gkostka
    Product
    Lwext4

    Exploits

    https://github.com/gkostka/lwext4/issues/90https://github.com/sigdevel/pocs/blob/main/res/lwext4/2/sig8_2_lwext4_ext4_blockdev_c_127https://infosec.exchange/@sigdevel/116668952003072580https://github.com/gkostka/lwext4/issues/90

    Common Weakness Enumeration

    CWE-369 Divide By Zero

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High