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CVE mentions, exploit signals, and PoC evidence in one fast public view.

CVE detail

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.

CVSS 5.5 · MediumBuzz score 33.12 public exploit repository references

Buzz score

Why this CVE is surfacing

Buzz score total 33.1

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 16.1 · diversity 8.0 · KEV 0.0 · OTX 0.0 · PoC 9.0
Mention score
16.1
4 evidence mentions in the snapshot
Diversity score
8.0
3 sources across 1 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
9.0
2 repos · best confidence 0.90
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
4 source links · newest first

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

2 repository references · best confidence 0.90 · max 0 stars
  • sigdevel/pocsHigh confidence
    githubNVD Exploit reference0 starsDiscovered Jul 22, 2026, 9:11 PM

    NVD labels the source link as Exploit; this is not independent verification of the repository's code.

  • gkostka/lwext4High confidence
    githubNVD Exploit reference0 starsDiscovered Jul 22, 2026, 9:11 PM

    NVD labels the source link as Exploit; this is not independent verification of the repository's code.

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